150 MILLIMETRE CAVITY TO MEET NEW BUILDING REGULATIONS

[@MattRoscoe1]

The problem with watching these videos is you start looking for things you never knew were even things before. My wife asked me why I was looking at the wall above the living room window so I just replied "looks like that is a steel lintel and its rusted, no weep vents, and I bet it doesn't have a cavity tray". She just shook her head and walked off. Could have been worse - another channel I like is the drain un-blockers from Liverpool ... at least I didn't have my head down a manhole

[@philipfell4292]

Now there would be a collab video…. Steve, Alex & the drain unblockers building a brick manhole….

[@SteveAndAlexBuild]

😆😆🧱👍🏽

[@Tom_Plumb_PHS]

The sound of success😁👌

[@colinwilson210]

@Merseyrod are full of shit though, especially when they let the trainee drill the soil stack ;-p

[@simonboulton978]

Question, few years ago we has to put block against external wall with a roll of damp proof D.P.C, where the window or door opening so that you won't see insulation?

[@davecleggett9371]

Lucky Customers to have you guys working on their projects - hope they appreciate your dedication to perfection. Hope the hips are bearing up Steve and that Al's health is doing OK, best wishes to you both.

[@SteveAndAlexBuild]

Cheers Dave 😁🧱👍🏽

[@SteveAndAlexBuild]

Er don’t know what lauded means 🙄

[@kenpinion8108]

Sorry boys I'm a day late, I spent most of yesterday at the hospital absolutely sheering by the time I got home all there was time for was eating and then bed. I have just watched you video thoroughly enjoyed it nice to see you two building, Keep up the good work, best regards Ken

[@SteveAndAlexBuild]

Thanks Ken, hope you’re ok pal 🧱👍🏽

[@anthonyhoult152]

Going to be building house walls as thick as castles soon but with cavity. The trouble though the plot size will remain the same size and looks like a monster house from the outside but is so small on the inside you have to buy dolls house furniture 🤣🤣 Great work as always and really enjoy watching your videos 👍👍👍

[@SteveAndAlexBuild]

Cheers Anthony 😆🧱👍🏽

[@JohnnyMotel99]

That would be the situation if we carry on using brick and block, I'd like to see planning rules to allow more use of insulated SIPPS. It would means changing the external look of our new builds, not a bad idea.

[@anthonyhoult152]

@@JohnnyMotel99 I personally feel more builders need to learn how to build properly and not have to have their work snagged due to their shoddy workmanship

[@ianwright308]

We are still using thousands of years old building techniques that is crafty, shoddy at times… when in real life with ICF systems you can make a far more insulated (almost zero draft or cold bridging, stronger walls, securer (almost impossible to smash through due to rebar and solid concrete walls), and faster to build. I’ve built a large building out of ICF and the materials were slightly more, but labour was far less, so it balanced out at the same if not less cost and was finished in 3 weeks.

[@SteveAndAlexBuild]

What’s ICF ?

[@Michael-di5cl]

bricklaying is a real graft,well done for doing such a brilliant job,im a plasterer and i appreciate a good tradesman.

[@SteveAndAlexBuild]

Cheers Michael 🤜🏽🤛🏽🧱👍🏽

[@stuandvicksadventures]

Cheers for replying,I mostly build schools,hospitals working for subcontractor,miss doing exstensions etc

[@SteveAndAlexBuild]

No cakes or brews on the big jobs 😫😉🧱👍🏽

[@raydebbiemcdonald3208]

Love the bit at 15:35. For those who remember....."Al, Al, Al" Made me smile.😅

[@SteveAndAlexBuild]

😏😁🧱👍🏽

[@barrypeers8665]

12 years ago i built a place in shropshire 200 mm cavity with 7 newton thermalites on the inside the 25mm glass units should have been treble glased to match the 200 insulation performance even in the depths of winter the house was warm a multi fuel burner ticking over no gas or oil bills well worth it .the only setback on small projects like this the customer looses 200mm from a small extension which is a fare bit

[@SteveAndAlexBuild]

🧱👍🏽😬

[@LaughingGravy.01]

Ahead of the curve

[@janlesinski4719]

Whenever I watch you work I am impressed with your dedication to quality

[@SteveAndAlexBuild]

Thanks very much 🧱👍🏽

[@robwhitfield6936]

Another fantastic job 👍🏻

[@SteveAndAlexBuild]

Ta Rob 🧱👍🏽🤜🏽🤛🏽

[@모른다몰라]

interesting video. I love watching builing contents.

[@SteveAndAlexBuild]

Glad you enjoyed, thanks 🧱👍🏽

[@frog-eye1420]

Nice quality work and a very tidy work area 👍

[@SteveAndAlexBuild]

Thanks pal 🧱👍🏽

[@paulbowes5586]

And yet another fine job. Great content and never mind the losers who just hate, you know what you are doing!

[@SteveAndAlexBuild]

Thanks Paul 🤙🏾🤙🏾🧱👍🏽

[@smellypunks]

I live in a 2004 build with 100mm full full cavity and uninstalled solid floor. We have electric only storage heaters and this last year is been very expensive to heat the flat. So I am happy to see larger cavities/more insulation on builds.

[@kenneal8948]

I was designing to that standard in the 1970s. We should be building to a 300 Rockwool full filled cavity with 450 Rockwool in the roof and a an airtightness of below 0.6 air changes per hour.

[@SteveAndAlexBuild]

🤯🤯

[@smellypunks]

@@kenneal8948 300 full fill, that is sounding like a passive house, which is good for the top end but it is about getting the bulk of houses up to European standard as a minimum. Current regs ask for 0.18W/m² for walls which is much better than the old 0.30W/m² of a a few year back. The UK has been a laggard its about time we got it sorted. I am not even sure if 300mm cavity is a thing. Would they not just use PIR board in a 150mm cavity to provide the same U values.

[@kenneal8948]

We need to go for the top end now. There are 27 million inadequately insulated existing houses in the UK already without adding to them. It costs a fortune to further insulate a house, I've designed three renovations on 1970s houses to save 80% on their energy consumption and one of those cost £30k, but it only costs a couple of thousand extra to do the job properly in the first place. There is not only the climate requirement but now also the security and fuel cost aspects as well. If you are building with PIR boards you would need a 200 board to equal 300 of fibre or polystyrene. I specify a 100 dense aggregate solid concrete block for the inner skin to give thermal mass to enable the use of night time cooling during the summer. When you are using that much insulation the use of a thermal block doesn't make much of a difference to the insulation value of the wall and the cheaper block also helps with the costs.

[@SteveAndAlexBuild]

🧱👍🏽

[@castingshadows282]

Great block work guys. Looks so amazing from where I were siting. Even the roof fitted perfectly. 😎🙃🖖👍

[@SteveAndAlexBuild]

Cheers we like a nice bit if block work 😁🧱👍🏽

[@benwilliams1172]

was working in Belgium in 2008 and cavity was that big on houses, we used spiral rods instead of wall ties that are used in uk. layed inner leaf with rods spaced out. and then pushed rods through insulation

[@SteveAndAlexBuild]

👌🏼🧱👍🏽

[@thetallcarpenter]

Hi guys🖐As many of your other commenters have said, I'm using 90mm T&G PIR boards in my cavities, which is a little more expensive, but better thsn losing another 50mm of space, which is particularly important when doing extensions👊 (I didnt let the builders bricklayers fit it though😵‍💫) Cheers Del

[@SteveAndAlexBuild]

I hate that stuff Del 🤢. I don’t like building the internal first . It’s more than double the price up here £25 per sheet 🥺🤯🧱👍🏽

[@thetallcarpenter]

@Bricklaying With Steve and Alex It's the same price down here Steve, but I just couldn't bear to loose 100 extra mm off my floors space😬I have made a good job fitting it, but it's not user friendly at all, and after the the first lift, it can get out and not join up nicely. Certainly not as user friendly as the wool stuff😶 I'll send you some pics👍

[@garyharrisonuk]

Oh crap... if Del has trouble keeping it tight and locked in, I've got no chance

[@tomthumb1769]

@@SteveAndAlexBuild £25 per sheet there proper taking your eyes out !!

[@SteveAndAlexBuild]

Nice one cheers Del 🤙🏾🤙🏾🧱👍🏽

[@ColinWatters]

Isnt PIR (0.022 W/mk) about twice as good as rock wool (0.040W/mk) ? So your cavity could be 80 or 90 mm instead of 150mm?

[@SteveAndAlexBuild]

Nope even with .32 it’s still 150 mm . You need ridiculously expensive pir boards to keep the 100 mm cavity 🧱👍🏽

[@darrenmackenzie1892]

Great video... Im looking to get a small extension just purely for an area to sit and eat at a dinning table.. planning a rough layout in my garden but wanting to know the depth from the exterior wall to the inside wall?

[@SteveAndAlexBuild]

350 mm 👍🏽🧱

[@darrenmackenzie1892]

@@SteveAndAlexBuild Thanks. What size would you recommend for a dining table of 6 chairs and a table for a small extension?

[@nigelsmith1198]

Last new build I built was 150mm cavity with 150mm Celcon internally.!!😳.. worlds gone mad.! Keep up the good work lads 👍

[@stuartandrews4344]

Glad I've hung up my trowel now, but do we really need the 150mm cavity, more new building regulations BS again, been better to reinvent a better insulating 100mm cavity batt..

[@SteveAndAlexBuild]

Bonkers mate 🥵🥵🧱👍🏽

[@tlangdon12]

@@stuartandrews4344150mm of insulation in the cavity is good for efficiency. A better 100mm cavity product exists: Kingspan K106 (Thermal conductivity is 0.018 W/m·K) so nearly twice as effective as the Knauf cavity batt (0.032 W/m.K). It's there if you can afford it.😀

[@SteveAndAlexBuild]

Double the price plus extra labour installing the stuff and taping and installing the frizbies 😒. Not a fan of Internal skin first 🧱👍🏽

[@tlangdon12]

@@SteveAndAlexBuild No, I can see that you’re not. It’s still good to see the pride you take in working outside in

[@Schnorbitz]

Lovely deep window sills, at least

[@SteveAndAlexBuild]

Always a plus 😁🧱👍🏽

[@Jaaammmbbbooo]

That lad needs to get a watch. My gosh, how long it takes him to confirm the time. These modern kids I swear.

[@SteveAndAlexBuild]

What’s a watch 🤨😂🧱👍🏽

[@E69apeTheMatrix420]

Now You have a decent drill (120NM / 2000rpm) You can buy a mixing paddle and knock up your mix in a bucket like butter! When it goes off you can bring it back to life so easy. well worth it in the hot months.

[@SteveAndAlexBuild]

🧱👍🏽

[@timothystevenhoward]

wow like legos. you make it look easy!

[@SteveAndAlexBuild]

😆😆🧱👍🏽

[@kestutisbagusauskas8323]

Good placement of camera even the clothes line in the background had flashes of red!

[@SteveAndAlexBuild]

😂😂🧱👍🏽

[@davecooke914]

Great job Steve as always i would had window on big wall over looking garden feel dark no you just go from plans keep up great work 👍👍

[@SteveAndAlexBuild]

It’s a toilet window Dave 🧱👍🏽

[@davecooke914]

@@SteveAndAlexBuild ok great job as always look forward to nx video 👍👍

[@SteveAndAlexBuild]

🤙🏾🤙🏾🧱👍🏽

[@SteveBernard42]

Class work fellas, a credit to you both.

[@SteveAndAlexBuild]

Thanks Steve 🤜🏽🤛🏽🧱👍🏽

[@SlowhandGreg]

I specced a secondary layer using superfoil basically standard breeze with insulation in then batten superfoil batten then plasterboard its 30 outside and 23 in the extension. The air gap is the key the stuff is like space suit material piece of cake to put up highly recommended

[@SteveAndAlexBuild]

🧱👍🏽

[@JayKTS]

Looking good guys ! I promise it will not get easier with all the regulations I bet more things are coming your ways .. first it’s insulation and eliminating or making cold bridges better , next up is airtight building and than you have to build passive homes ;)

[@SteveAndAlexBuild]

Big changes and a lot to get our heads round 🤯🤯🧱👍🏽

[@andrew30m]

Making houses warm and cheaper to heat isn’t a bad thing🤷🏻‍♂️

[@Bertie_Ahern]

I look forward to everyone suffocating in ultra-high CO2 conditions without fresh airflow lol

[@SteveAndAlexBuild]

Bit dark

[@norwegianzound]

Are you suggesting this is a bad thing?

[@JohnMackenzieInverness]

Nice work I laughed when Steve reached for the level and it fell the wrong way So its not just me that does that :)

[@SteveAndAlexBuild]

Every time 🙄😂🧱👍🏽

[@colinbrigham8253]

Thank you 😊 rhis brings back memories

[@SteveAndAlexBuild]

Good ones I hope Colin 😁🧱👍🏽

[@AshB2023]

Love that, chief!

[@SteveAndAlexBuild]

😁🤙🏽🧱👍🏼

[@sgtmark8844]

Good job. I have a question here is the us most exterior walls are framed with lumber the either sided or bricked on the exterior and plasterboard on the interior. All electrical plugs and switch wires are run in walls before plaster board and insulation are done. So my question is how is the electrical done on exterior walls.

[@SteveAndAlexBuild]

It’s all clipped to the wall before the plaster board are put on 🧱👍🏽

[@johncoppock3823]

Top job, great to see it finished with the roof on. Assume as well as improving insulatuon, thise cavernous cavities also help reduce the problem with insulation promoting damp transmission across the cavity? In this case however assume its probably having cement render on the outside so shouldn't be any issues for a few good years whilst that is all intact.

[@SteveAndAlexBuild]

😁🧱👍🏽🤙🏾🤙🏾

[@davidnash1220]

This is good work thumbs 👍 up

[@SteveAndAlexBuild]

Thanks David 🧱👍🏽

[@Derekryan456]

Wish we used them blocks and insulation in Ireland. I woukd say a 4 solid woukd weight 4 of them blocks your using. As for the insulation for 100 or 150mm cavity its full fill soild insulation no room for error . Has to put in carefully or it push out your blockwork

[@SteveAndAlexBuild]

🤯🤯🧱👍🏽

[@chriswild2458]

Neat job lads, very good

[@SteveAndAlexBuild]

Cheers Chris 🧱👍🏽

[@MattRoscoe1]

I look forward to your videos coming online :-) Stuck in front of a computer working its great to have these on next to me - something satisfying about watching a couple of professionals do a fantastic job and explain how its done... even though I am not in the trade I've learned a thing or two.

[@SteveAndAlexBuild]

That’s great to hear Matt, thanks 🧱👍🏽🤙🏾

[@petrirantavalli859]

There is a lot of sense in insulating for example uninsulated 15-20mm heating pipes in a boiler room waste up to a 6-7€ per meter in heating costs with 15mm pipe insulation wastage drops to a roughly 1-2€ per meter and 1 m^2 of windows generally waste heat as much as 5-10m^2 of equivalent wall. Biggest savings however come from insulating your roof as the heat likes to rise up. In general it's recommended to have a roof insulation thickness x1,5-2,0 compared to wall insulation. Pay back time in saved energy costs from added insulation used to be 5-10 years but with the rise of energy costs it's likely even lower now as it is. Here in Finland a minimum wall insulation is currently 300mm's of rockwool or equivalent insulation and 500mm's for roof/attic space.

[@SteveAndAlexBuild]

🧱👍🏽

[@keithskelton5596]

Improving the U value of the envelope is a positive move Should have been imposed years ago ✌🏼🏴󠁧󠁢󠁥󠁮󠁧󠁿

[@SteveAndAlexBuild]

🧱👍🏽

[@grolfe3210]

Just a thought on this, the concrete blocks are not very good for insulation so you are relying on the 150mm wool. Instead of the inner leaf, if it had a timber frame then you could still get 150mm of insulation between a 50 cavity and 100 in the timber frame. Must have nicer neighbors than me to not be round when you were chopping the blocks on a sunday morning!

[@SteveAndAlexBuild]

They aren’t concrete blocks 🧱👍🏽

[@christianwithers7335]

Subscribed 👍 great job lads. May I ask...if you had a freezing house and then built a 2025 regs extension, how much benefit would be given to the old part? Possibly EWI on some walls connecting to the extension. Obviously what you saved on heating the new could be instead put into the old.

[@SteveAndAlexBuild]

Thanks Christian . It’s a massive grey area 😬🧱👍🏽

[@joshnorfolk931]

Great stuff as always. Might’ve missed it.. but does the footings need to be 50mm wider to account for the extra wall thickness?

[@SteveAndAlexBuild]

Thanks Josh , yes pal 🧱👍🏽

[@danielallen436]

Keep up the great work lads . Nice to see there are still properly built houses going up . Timber framed super insultaed firerisks that you can hear next door but 4 coughing in have become far too common, nice to see some still doing the job right

[@SteveAndAlexBuild]

Thanks Daniel 🤙🏾🧱👍🏽

[@wayne3138]

Hey, guys. Good job as always. Did you need cavity trays and weep vents for this one? As you didn’t show in the video. Cheers.

[@SteveAndAlexBuild]

No Wayne it’s a flat roof 🧱👍🏽

[@wayne3138]

@@SteveAndAlexBuild thanks for replying. My architect tells me those are needed always. However I’ve also seen people went without those like your case. So I’d like to know about your theory. What are the rules about it? Many thanks.

[@alexdewar6584]

You are very tidy workers.

[@SteveAndAlexBuild]

Thanks Alex 🤜🏽🤛🏽🧱👍🏽

[@DB-ok8zf]

Hi mate, question about your threshold/doorway detail, how come on this job youve built up the inner leaf where generally you run the slab right up to the outer leaf insulated upstand, and in this job did you insulate that bottom threshold cavity, cheers guys

[@SteveAndAlexBuild]

Hi we were asked to do it that way . We never do it that way normally 🧱👍🏽

[@DB-ok8zf]

@@SteveAndAlexBuild cheers pal, so you prefer extending the slab

[@SteveAndAlexBuild]

@DB-ok8zf Always. It’s the correct way 👍🏽🧱

[@brickrightbuildinglandscaping]

How you doing steve . Had them cavities in wales a while now difficult to get lintels cavity closures etc to accommodate the cavity. I think its all a bit OTT now the cavity is now another room. 65 mm i think it was when i started. Cracking job on a Sunday again . Rest up take it easy steve mate 👍 🧱🧱👌

[@SteveAndAlexBuild]

Cheers Justin, yeah the lintels etc are catching now, our local supplier Firwood even stocks 350 wide trench blocks now. 50 mm cav when i started mate 😫🧱👍🏽 Al in Sweden and we are in Drayton Manor spending some grandparent time 😍👍🏽🧱

[@brickrightbuildinglandscaping]

@Bricklaying With Steve and Alex I no trench blocks that size are hard to get . Enjoy your time off Steve mate you deserve it you and Alex always put a shift in. Enjoy mate 👍 👌

[@SteveAndAlexBuild]

Cheers Justin 🧱👍🏽

[@davidregis1890]

Nice work guys, out of curiosity. Won't the insulation act as a route for damp to bypass the damp course onto the bricks above? Or does the insulation start above ground level?

[@SteveAndAlexBuild]

Insulation starts at dpc and water doesn’t travel up mineral wool cavity batts 🧱👍🏽

[@viankalobosvalenzuela7456]

Excelente trabajo saludos 👌👍🧱⚒️👍

[@SteveAndAlexBuild]

🤜🏽🤛🏽🧱👍🏽

[@tomvincent5596]

On an extension I've just started new regs. B/c are letting me keep 100mm cavity but use 50mm insulated plasterboard to build instead.

[@SteveAndAlexBuild]

We could do that but it works out more expensive and labour intensive . We did that on one last year plus your walls still end up 350 mm wide 🧱👍🏽

[@boing615]

I always though insulation has to have an air gap to the outer leaf, doe this not allow damp to soak through the block?

[@SteveAndAlexBuild]

No

[@NeilOxby]

Hi Steve and Alex. Some great videos of your work. Where are you guys from and what is your working radius?

[@SteveAndAlexBuild]

Hi Neil thanks, we are in south west Lancashire but don’t travel far . 🧱👍🏽

[@NeilOxby]

@Bricklaying With Steve and Alex ok that's a shame keep up the good work

[@leavemyrightsalone]

That is so me.....PERFECTION 100% or die!!

[@SteveAndAlexBuild]

🧱👍🏽

[@dasgill4761]

Great video. How do you ensure that the cavity width is maintained as you build up? So that you don’t end up with a larger or smaller width in different areas?

[@SteveAndAlexBuild]

It’s all about preparation. You make sure your external wall is plumb then you can measure your internal of it for speed 🧱👍🏽

[@gbentley8176]

I suspect we have passed the trade off point between sensible insulation for sound and thermal and water. To my mind air gaps and ventilation in a wet climate regardless of build type is essential. Too many properties are a fungal death trap with all the sealing up. I built my house decades ago using traditional methods and double thick inner skin. No damp, cheap to run and warm even though some walls 20ft long are glazed. Horses for courses but netzero is mad. As an old long retired scientist I will not see the end and it is worrying, especially going down the timber route, as for plastics etc just remember where this stuff chemically comes from! Excellent videos chaps. God bless.

[@SteveAndAlexBuild]

Cheers 🧱👍🏽

[@ETB9090]

I still use 100mm cavities with 90mm Eurowall + (the t&g stuff), which complies with the current regs 👍

[@SteveAndAlexBuild]

🧱🧱👍🏽

[@gre4ny214]

Genuine question why have 150mm cavity and then fill it with Rockwool which in my mind retains water if it was to get in also not be able to dry out because there is no open cavity to allow air to flow and breath

[@SteveAndAlexBuild]

It’s not rockwool Fibreglass cavity batts don’t retain water 🧱👍🏽

[@philtucker1224]

Why was Alex holding that shaving brush in the outro? 😂🤣 just kidding, nice work again lads. 👏

[@SteveAndAlexBuild]

That is a very expensive shaving brush 😆😆🧱👍🏽

[@DJCJ999]

So do you not need to have a gap between the outer block and the insulation?.. and no breather sheet?

[@SteveAndAlexBuild]

No 🧱👍🏽

[@DJCJ999]

That's handy... I'm hoping to self-build next year in Scotland but there's a bunch of new reg's since the last time I did any building @@SteveAndAlexBuild

[@SteveAndAlexBuild]

@DJCJ999 . Double check as the regs might be different up your way 🥶🧱👍🏽

[@eddieMurphy11111]

that is thick insulation I bet the people will not hear anything out side when it is done keep well and safe thanks for the video

[@SteveAndAlexBuild]

Definitely Eddie 😆🧱👍🏽

[@celticminstrel8252]

Different regs for different areas, here we would have to cut in a vertical DPC where your blockwork meets the existing building.

[@SteveAndAlexBuild]

🧱👍🏽

[@cai1356]

Its not diffrent Building regs you should be putting vertical DPC where blockwork meets the existing building on all extensions ?

[@SteveAndAlexBuild]

@cai1356 . It is different regs and it varies from person to person who comes out to inspect 🧱👍🏽

[@cai1356]

The Building Regs dont change they are the same throughout the whole Country . Not only is it good practice it is sensible to do so due to moisture penetration for a start. always look at weak points in the design and challenge. All Building Control Inspectors should be picking this up I was one ! so should all good builders too.

[@cai1356]

The Building Regs dont change they are the same throughout the whole Country . Not only is it good practice it is sensible to do so due to moisture penetration for a start. always look at weak points in the design and challenge. All Building Control Inspectors should be picking this up I was one ! so should all good builders too.

[@Soulboy63]

Great job , we have poorly insulated housing in the Uk ..more insulation is better

[@SteveAndAlexBuild]

Very true 🧱👍🏽

[@fraserhardmetal7143]

Pleasure to see neat blockwork - I wonder what the regs. are on block specs. Given that they have upped the cavity insulation requirement, how much attention has been given to inner and outer leaf properties. Seems like an opportunity missed not to specify a higher insulating material for the building structure as well.

[@SteveAndAlexBuild]

It’s all accounted for 🧱👍🏽

[@drummist6212]

Should you not be using thermal blocks on the inner leaf? Also you can still use a 100mm cavity with the insulation to match so I understand.

[@jonsore9795]

90mm interlocking PIR with residual 10mm

[@nihomkong1474]

Great

[@SteveAndAlexBuild]

🧱👍🏽

[@markrainford1219]

Comes down to diminishing returns. The first 50mm insulation is the most beneficial/cost effective. It then starts to drop to the point of pointless.

[@SteveAndAlexBuild]

😬🧱👍🏽

[@davidoffthrux7383]

At 14:15 He just flicks the excess mortar behind him without looking. It lands perfectly on the mix. *nods with approval*

[@SteveAndAlexBuild]

😌 😆🧱👍🏽

[@mickbroadbent6750]

hi gents is there a reason why you only do 1 skin at a time n not both at same time cheers looked brill

[@SteveAndAlexBuild]

Much easier 🧱👍🏽

[@djhago3123]

Because its hard to reach across if the inner leaf is up and not gone off.. so just back it up afrer

[@johnhaydon4055]

lovely work as always, your customers are a lucky bunch , I hope they keep you well supplied with tea and biccies.. The insulation issue does seem a bit trying especially finding gear to fit and etc, but the flip side is much lower heating bills which is a biggie nowadays. ATB from J&H Builders

[@SteveAndAlexBuild]

Cheers John 🤜🏽🤛🏽🧱👍🏽

[@wotviewer]

love the idea you were not filming "with all the cutting and dust" whilst the client had washing out on the line drying

[@SteveAndAlexBuild]

😏🧱👍🏽

[@alexisdriscoll9209]

most new houses in Ireland have a 200 mm cavity

[@SteveAndAlexBuild]

😳🧱👍🏽

[@rikardekvall3433]

Nice craftsmanship! Do you also leave some small ventilation gaps at the bottom and top on the outside wall, for exhaling the moisture?

[@SteveAndAlexBuild]

Thanhs Rikard, no we don’t 👍🏽🧱

[@SteveAndAlexBuild]

Thnaks. no 🧱👍🏽

[@hunterluxton5976]

Fantastic video. What device did you use to capture this? Was it a Go-pro?

[@SteveAndAlexBuild]

Thanks very much . No we don’t use GoPro any more, not very good. We switched to the DJI OSMO ACTION 3. The 4 is out now but they have good Black Friday deals on the 3 . Far superior cameras. ( they are the drone people ) 🤙🏾🤙🏾🧱👍🏽

[@johnbowkett80]

I'm a 67 year old brickie . I remember when cavities were 2 inches (50 mm) 👍🏴󠁧󠁢󠁥󠁮󠁧󠁿

[@SteveAndAlexBuild]

Me to John 😬🧱👍🏽

[@LaughingGravy.01]

Bet your utility bills were small too, back then

[@johnbowkett80]

@@LaughingGravy.01 You can believe this or not . I got married in 1978 and I was being paid £32 a day working for Birmingham's biggest subbie . We rented a bedsit with shared toilet and bathroom for £13 a week . After nearly a year there I took the landlord to the Rent Tribunal and got the rent REDUCED and FIXED for a 5 year period down to £3.50 a week ........ £3.50 a week and he had to pay me over £400 compensation . We left and bought our first house . GREAT DAYS INDEED . 👍🏴󠁧󠁢󠁥󠁮󠁧󠁿

[@johnbowkett80]

@@LaughingGravy.01 Very small ...... And wages were very good . 👍🏴󠁧󠁢󠁥󠁮󠁧󠁿

[@eliinthewolverinestate6729]

We do 8 inch cmu block with 4 inches of mineral wool, low perm air barrier, 2 inch air gap, and masonry veneer. Which ends about 2 feet thick or 609 mm.

[@SteveAndAlexBuild]

😮🤯🤯🤯🧱👍🏽

[@jevgenijs39]

Nice to see using concrete blocks for inner wall, personally do not like thermalites

[@SteveAndAlexBuild]

They ain’t concretes they aren’t thermally efficient enough any more . We use fibolites 👌🏼🧱🧱👍🏽

[@jevgenijs39]

@@SteveAndAlexBuild nice never heard of them before. But using this kinda blocks is not not regulated by building control? Just personal choice am I right?

[@SteveAndAlexBuild]

@jevgenijs39 . They are very strong and very thermally efficient so actually better than thermalites . They are encouraged by building control 🧱👍🏽

[@tonydoggett7627]

I’d be doing brick veneer construction like in Australia. Steel or timber frame with insulation. Plasterboard on internal wall. We have extremes in temperature. 🦘

[@SteveAndAlexBuild]

🧱👍🏽

[@soundslight7754]

Good job, well done. 150mm cavity makes the wall stronger or it's about improving thermal efficiency?

[@SteveAndAlexBuild]

All about the insulation 🧱👍🏽

[@soundslight7754]

@@SteveAndAlexBuild Thank you 👍

[@SteveAndAlexBuild]

🧱👍🏽

[@MikeHowlieson]

Spoke to my local Building Inspector who said you can still build with a 100mm Cavity but you must achieve the New U Value Rating, which I cant remember what it is. He said to use 60mm King Span as Cavity Batt with a 40mm clear Cavity, don't full fill the Cavity, use a Thermalite inner block and then use a 25mm King Span backed inner Plaster Board to achieve the new U Value.

[@SteveAndAlexBuild]

There are all kinds of ways to reach the u value . 👍🏽👍🏽🧱

[@mattybro88]

Pushed in ties 😲

[@SteveAndAlexBuild]

Nope

[@mattybro88]

@@SteveAndAlexBuild 7:38

[@6c61]

Impressive how much two people did on a Sunday.

[@SteveAndAlexBuild]

🧱👍🏽

[@MarkSmith-jt1yj]

Just looked a esco house to build 300mm cavity ooh

[@SteveAndAlexBuild]

🤯🤯🧱👍🏽

[@dylanfallon7229]

I recently built a house with a 200mm cavity 😕 was a nightmare building off band stands overhand 😳 all heavy concrete blocks too here in the west of ireland

[@SteveAndAlexBuild]

Jeez not good for the back 😬🧱👍🏽

[@dylanfallon7229]

Absolutely not 😢 had to build 7 course all the way around then no choice but the bring up the external leaf on band stands and nearly stand on blockwork on the internal and hope and pray that the wind wouldn't catch it by the time I'd it backed lol. Got it done. I went a bit over board with wall ties in the gables also just to be safe because I've seen too many gables come down over the years. Luckily enough it was only a dormer so once I reached joist height I only had to fill between joists and then gon3 courses above that and only had 2 gables. it was an drea house to build tobe fair just a big rectangle son4 courners 🤣 9 windows amd 2 doors 🤣if only they all came like they lol

[@SteveAndAlexBuild]

😁🤙🏾🤙🏾🧱👍🏽

[@Nailnuke]

I had an old building to renovate, the walls were rubble filled which meant the insulation had to be on the inside, what a revelation. Insulated plasterboards on the exterior walls, insulated stud walling, insulated rafters (sloping ceilings) Add to that sound boards & fire boards. It all added up to 2 really warm, quiet and cheap to heat 1 bedroom duplex flats. From my experience, I don't know why all homes are not insulated this way, why heat up interior breeze block walls, I was able to use 24kw boilers, which barley came on, even in winter.

[@SteveAndAlexBuild]

🧱👍🏽

[@farrier2708]

Have you calculated the saving and how long it will take to recoup the cost? If you're insulating for comfort; OK! Doing all that to "save" money? I'm not so sure. It would be an interesting calc'.

[@Nailnuke]

@@farrier2708 Ahh it was compulsory ! Couldn't have got planning without complying with building regs. Yes it was expensive in materials, I seem to remember 7 years ago it was £40 per 4 x 8 board, I fit everything myself then got a plasterer in. I reckon to have got professionals in, it would have cost 30 to 40 thousand ! Of course no one tells you this when they are pushing heat pumps !

[@SteveAndAlexBuild]

😬😬🧱👍🏽

[@farrier2708]

@@Nailnuke Ah! I was born into Architecture. My dad was an Architect and I was in the profession for 40+ years. In all that time, only very occasionally did I find that any change in regulations had to do with anything but creating jobs. The amount we have to pay for non-productive staff these days, just to administer regulations, is enormous. Who has to pay for these people? The Client! While Government reap the benefit of tax revenues. Well! That's this old blokes rant for today. Thank God I don't have to work for a living any more. 😎👍

[@huwcutts9620]

We do 100mm cavity with 50 insulated plasterboards on our extensions same u value

[@SteveAndAlexBuild]

🧱👍🏽

[@mrdeafa25]

Cant understand why anyone would moan about having insulation. I went overboard with it when I refurbed my property 10 years ago but boy am I reaping the benefits now. Warm as toast in winter and fresh and cool in the summer with heating bills similar to a 3 bed semi in a 20 room country house.I will never forget waking up with ice on me when I was a kid and Im not having my kids experiencing that displeasure.

[@SteveAndAlexBuild]

Nice one 👍🏽🧱

[@djhago3123]

Would you believe we are doing 200mm cavity in Ireland for pumped insulation

[@SteveAndAlexBuild]

🤯🤯🤯😳🧱👍🏽

[@LondonStuff.]

Is 150mm really necessary if you’re using PIR instead?

[@SteveAndAlexBuild]

No need if you use pir 🧱👍🏽

[@yogibear284]

how does water not leech from the external skin to the internal leaf? Is the insulation completely water proof?

[@SteveAndAlexBuild]

Water doesn’t get through the outer skin in the first place 🧱👍🏽

[@yogibear284]

Here in Ireland there is a high risk of water penetration using that full fill system (unless it is a certified bead). As a brickie myself I have seen water travel through on ties and damp spots evident internally . An external plaster with water proofer isn't a guarantee either. While moisture might not get through entirely I have seen insulations become damp and disintergrate in the cavity. Your climate must be drier than ours? Just a though mate@@SteveAndAlexBuild

[@ratscabies8458]

It’s simple, just built with timber frame and insulate between the studs. That’s how most the developed world builds and the vast majority of this country. It’s done like that for this exact reason !

[@SteveAndAlexBuild]

Timber frame isn’t used by the vast majority at all 🙄🧱👍🏽

[@farrier2708]

They've been trying to bring in "industrialised building" since "Adam were a lad" and it's always proved problematic in the long run. I predict that in less than a generation we will be demolishing the timber frame buildings we're constructing now Then again, I have this theory that the Government are trying to make housing a consumer product. That would mean, when it comes time to replace the kitchen, you'll knock down the whole house and rebuild. Good for the economy. Not so good for the punters pocket.

[@johnswain6485]

They Plasmor Fibolite blocks ??

[@SteveAndAlexBuild]

Oh yes ! 😍😍🧱👍🏽

[@user-pd4do6tn6w]

I’ve been told by my architect that I can use 90mm Recticil Euro insulation board and this will satisfy regs instead of needing 150mm of insulation. Any thoughts on that?

[@SteveAndAlexBuild]

Yes that’s fine but it’s ridiculously hard to build with a 10 mm gap plus we don’t like building internal walls first 😑🧱👍🏽

[@nei1s]

That's something that has caused me trouble in the past..... having insulation that is in contact with the inside and outside wall. Any damage or constant driven rain eventually penetrates the outside wall and the insulation soaks it up like a sponge and transfers the damp to the inner wall with the obvious results 😂

[@SteveAndAlexBuild]

Never had that problem especially on rendered walls 🧱👍🏽

[@ColinWatters]

Shouldn't get that problem with rendered walls.

[@Vj77_Win]

What about using foil back and sides kingspan types of materials?

[@LaughingGravy.01]

you havent got a clue what youe talking about

[@nei1s]

@@LaughingGravy.01 more like you don't know what your talking about and especially on a post that's a year or so old 🔔🔚

[@Nas_Atlas]

Fantastic. Put some good windows in there and a well insulated roof and you could heat that room with a candle. Which is what you'll need to do now that natural gas will be unavailable going forward.

[@SteveAndAlexBuild]

🤙🏾🤙🏾🧱👍🏽

[@DeanW-1990]

Hi guys can you send me a link to your cavity wall ties for the new 150mm cavity regs please ?

[@SteveAndAlexBuild]

Not sure what the link is . Just go to your local builders merchants and ask for cavity ties for a 150 mm cavity. Or try tool station or screw fix . Be prepared they are expensive 😬🧱👍🏽

[@DeanW-1990]

@@SteveAndAlexBuild £20 for 50 wall ties from toolstsrion 275mm 🤢

[@vladjirasek]

No cavities in mainland Europe. They use solid blocks with trapped air providing much better insulation properties.

[@SteveAndAlexBuild]

🧱👍🏽

[@tomthumb1769]

You can still use 100mm cavity we use 90mm t&g rigid insulation bats. The problem you will find is you can’t get window boards wide enough for the inside

[@ehamster]

I’ve just built an extension with 90mm t&g. Regs are based on U-value calcs, to meet the requirement you either need 150mm rock wool or 90mm PIR. Going to PIR added a bit of cost, but easier to get lintels/cavity closers etc.

[@SteveAndAlexBuild]

It’s all in the way 🧱👍🏽

[@dorsetengineering]

@@ehamster don’t forget you need to tape that pir and be bang on with your cavity cleanliness if you’re going the pir route. Absolutely no chance of that happening on most sites, or getting the tape to stick to wet/dusty boards. Full full is easier and completely idiot proof.

[@SteveAndAlexBuild]

Definitely 🤙🏾🧱👍🏽

[@ETB9090]

@@dorsetengineering I use Eurowall + T&G which solves this problem, I used to tape k106 but Kingspan have told me theres never been a BBA Cert issued for this method so BC wouldnt accept it, the t&g aspect acts as a vcl as BC have told me, this was the issue BC had with using non t&g insulation, its not the thermal propertys as 90mm Eurowall + and k106 both achieve 0.018 in a 100mm cavity👍

[@foundationgood123]

Nice work there, were you okay using the dritherm 150mm insulation, or did they want you to use 100mm celotex cw4000 with a 50mm gap? I've just been banged with a ground beam, 2x windposts, the Building inspector asked for them which are extras😥, the Celotex insulation was already on the plan spec notes! Just wondered about the insulation as there is a difference in price. Cheers🧱⚒👍

[@SteveAndAlexBuild]

We go for the bigger cavity and .32 dritherm for ease of construction and price . The pir stuff needs internal first which we hate, costs a fortune plus you need a couple of days labour on top to install it as it so labour intensive. You can’t be expected to include that in your price . 🙄🧱👍🏽

[@foundationgood123]

@@SteveAndAlexBuild Yeah, PIR is very expensive. Just wondered if I could get away with using the 32 dritherm. I'll have to check with the inspetor🤞

[@SteveAndAlexBuild]

Good luck 🤞🏼🧱👍🏽

[@mikeraphone6745]

Never understand why a big cavity insulation and then when the starter is done on exciting walls the cavity is breached. They need to update the regs so there is no thermal breach . I would cut out the section and make good and built in the existing brickwork ad not use them starters. I know time is money but whats the point?

[@SteveAndAlexBuild]

🧱👍🏽

[@shaunbastin8456]

Hey guys love your videos. What blocks are you using are they fibrolites? Is this wall speced to 0.18w/m? Can you achieve this with 2 skins of fibrolite

[@SteveAndAlexBuild]

Thanks Shaun . Yes to both 🤜🏽🤛🏽🧱👍🏽

[@shaunbastin8456]

Thank you mate that’s great iv been pulling my hair out as our architect has speced thermolite inner skin and concrete blocks outer skin. I really don’t want to use thermolite would much rather do what you have done 2 skins of fiborlite and the 150mm full fill! Thank you!!

[@SteveAndAlexBuild]

👌🏼🧱👍🏽