Insulating concrete floor- 100mm insulation boards

[@gittin_funky]

@ConstructionwithKieren at 2:30 did you just brick up the timber for the staricase? Also, what can you do it you have central heating pipes and electic cables running the floor (brick walls) ? could these be cemented into the screen?

[@mrb3483]

Dont change a thing lads, straight to the point...

[@brianhaines5835]

Lovely to watch, great builder and decent music, what more could you want.

[@joeheffernan01]

So you can lay insulation on top of the concrete? What goes on top of the insulation? I'm building an extention and want to insulate the old part of the house, I was advised to dig down 8 inches, DPM, insulation then concrete over.

[@t-rex4211]

Chipboard flooring straight on top

[@lincolntuckwell5993]

Top video mate. Just started my kitchen diner again after 3yr break and 1st job is to insulate and screed floor. This has shown me what I need to know 👍🏻

[@ConstructionwithKieren]

Glad it helped mate!

[@bryanflint7499]

There should be a layer of DPM between the slab and the insulation and another layer of VCL before the screed goes on.

[@ninety1464]

Theres already a layer under the slab so no, you dont need one directly above it

[@raymondosullivan1958]

Rubbish. There’s a layer of dpm under the insulation no need to have another one

[@skiiddy]

@@ninety1464they have the membrane folded up in the corner ready to go on top of the PIR to prevent the screed finding its way under the PIR and to stop any chemical reaction between the foil and the screed however, best practice is an upstand of 25mm PIR around the perimeter too, to eliminate cold bridging.

[@mrboyban]

@@skiiddy Exactly! Thanks for that, I thought I was missing something here. I read a few comments above neglecting the use of visqueen over the insulation and it all sounded straight from the Wild West.

[@Nano_89]

Do you install wet underfloor heating systems?

[@TheEntourageOnline]

Is there another video where you add the concrete?

[@jericho9653]

Shoukd you not have put a 1 inch thinkness of insul board around the boundry walls and butted the 6 inch insulation up against it? Whats stopping the cold bridge there

[@nickedwards5629]

check thermal performance of buildings for edging insulation

[@jericho9653]

@nickedwards5629 really. I did mine 2 months ago, 6 inch downstairs with 1 inch upstand on all internal and external walls. Balls of a job. Is it better not to do upstand? If I was to go back u would have used 4 inch and 2 inch sheets to make 6 inch rather than use solid 6 inch sheets. Too much noching out and messing

[@leeyo5494]

hi was there the insulation under the slap, is that the only insulation of the floor?, thanks !!

[@constructioneerful]

Could you plonk a laminate floor onto that without needing a screed?

[@chrismoyler]

No, not at all! A laminate floor has no ability to bridge between the foam panel joints and no ability to withstand point loads like the feet of furniture. Instead, lay a 22mm water resistant chipboard floor, with all joints staggered and glued with pu adhesive. Make sure all dried adhesive is removed from the joints. Then install your laminate floor. Cheers

[@nathanglinn3266]

Just out of curiosity... I need to raise the floor by 200mm+. Can I double up on the insulation? Or is that a no no.

[@rome3766]

Is the dpm under the concrete. Is that the black dpm I can see around the edges?

[@ConstructionwithKieren]

Yes under the concrete!

[@DICEGEORGE]

Put foam in the gaps between boards? How much would that improve the insulation?

[@ConstructionwithKieren]

I’m guessing it would slightly but the sheets are very tightly together as it is mate

[@simonhenry1769]

I was also thinking whether foil tape over the joints would be worthwhile?

[@G7531]

Do you need to screed this after? Or could chipboard be used instead? I’m in a 8 year old house with a concrete floor and it’s supposedly insulated, but freezing in winter on the outskirts of the house mainly. Just looking for ideas before I replace flooring.

[@ConstructionwithKieren]

Ideally you should screed as its much more of a solid base!

[@stuartjones2242]

do it have to be foil backed if its just a normal screed over the top ,no under floor heating ?

[@DeanW-1990]

Why do people install the insulation under the concrete slab and some insulate above the concrete slab ?

[@helenagreen3438]

Hi, thank you for posting this video. Does it matter if the insulation is dipped in some areas and all the insulation isn't level. We have had timber floors removed and concrete flooring put down. Some.of it is quite unlevel. Is this a problem for underfloor heating and top screed? Thank you

[@ConstructionwithKieren]

No it doesn't matter to much, ideal if its bang on level but that's hardly ever the case!

[@smellypunks]

So the question is will 100mm thickness meet the new regs or will thicker PIR be required for floors?

[@ConstructionwithKieren]

It’s all down to the building inspector mate

[@skiiddy]

Did you tape the joints?

[@ConstructionwithKieren]

Yes mate!👍🏽

[@kay07949]

Can this be used to insulate a garage floor ?

[@ConstructionwithKieren]

If cars are going to be driving over it I assume not I'm afraid

[@thetrevcom]

Great videos, any videos of the extension build or details of the sizing and roof build?

[@ConstructionwithKieren]

thetrevcom I’ll be honest I never had any recording equipment at the time of the build, new extension videos will be in the coming weeks though🧱🔨

[@Recoverystore]

Hey man, how do you lay flooring on top of that?

[@ConstructionwithKieren]

Depends on what floor it is mate

[@oltaniecharles]

Can I install a vinyl sheet or peel sticker on top ?

[@handytbutler7380]

@@oltaniecharles as long as you lay down plywood and then underlayment you can put down any vinyl tile.

[@cristianenovaes3247]

Congratulations, good job!

[@ConstructionwithKieren]

Thank you! Cheers!

[@MiLiEl1024]

Better use Isoleika's ISO-CON panels. class A1 fire rated and 0.02 W/mK, apart of x2,5 compressive strength! 👍

[@chrise202]

Good luck finding them

[@ram64man]

Why didn’t you seal the edges with tape? On edges ?

[@nickedwards5629]

all the boards should have been taped together and ideally laid in a brick bond

[@crispy4306]

What point weight will this take? I’m doing a garage conversion (concrete floor levelled off using levelling compound) then I was going to use this method this method with chipboard or plywood over the top 18mm. I intend to put a weights in there, will it crush the insulation if I do?

[@Fleed907]

How did it go?

[@crispy4306]

@@Fleed907 I put a wood frame underneath in the end, all worked out fine - make sure the floor is well levelled though

[@jimmyryan1988]

Wondering if you could help me I’m planning to put my insulation boards down this weekend and noticed you have put yours right up to the bifold doors. I would like to do the same! Did you have to remove the inner course of brick and lay concrete in the cavity? Any help or advice is much appreciated. Thanks

[@ConstructionwithKieren]

Yes you do mate, you don’t always have to but it’s preffered better insulating wise!

[@jimmyryan1988]

@@ConstructionwithKieren I’ve had my slab poured to the inner skin so trying to come up with a solution so I can screed/ tile up to the bifolds 😬 Thanks for the reply 👌

[@ConstructionwithKieren]

@@jimmyryan1988 if not double layer the insulation in the cavity next to the bifold!

[@jimmyryan1988]

@@ConstructionwithKieren might have to do that nice one mate 👍

[@barrydoherty636]

Can you board straight over celotex or does it need dpm?

[@gsajeev119]

Would it not sink after years of installation? Do you concrete over them boards?

[@ConstructionwithKieren]

Why would it sink?

[@athlo]

Just a question but if you use a plastic sheet under the concrete, why would you need insulation? Wouldn’t the plastic prevent the concrete coming into contact with damp and cold?

[@ConstructionwithKieren]

The plastic is to stop the screed from eating into the foil of the insulation

[@newry123]

what way are you finishing the walls off,sand/cement render or dot and dab,,cheers

[@ConstructionwithKieren]

D&D with plasterboards mate, it’s the easiest/cheapest way👍🏽👍🏽

[@newry123]

@@ConstructionwithKieren thanks

[@ConstructionwithKieren]

@@newry123 thanks for watching mate

[@levaisandoralex6829]

Concrete goes top of that?

[@ConstructionwithKieren]

screed does yes

[@peanutbutterry6364]

What are you going to do with those polythene plastics?

[@ConstructionwithKieren]

What do you mean?

[@peanutbutterry6364]

@@ConstructionwithKieren Thanks for your reply Kieren. I meant that polythene (dpm) at minute 3:48. Is it ok to put polythene on top (or below?) of the insulation board as an additional layer of insulation to the floor? Thanks again for your reply.

[@oltaniecharles]

Can I install a vinyl sheet or vinyl peel sticker on top ?

[@petersmrek7617]

No In needs some floor boards first then floor of your choice

[@ryancole4563]

Hi, this is a great video! I am just about to do a mini garage conversion and wondered if I could use the 100mm Celotex insulation with Screed on top to bring the garage floor level with the rest of the house. Will I need a DPM layer over the Celotex before laying the screed? Really appreciate your advice.

[@sahinahmod6961]

Hi did you manage to do your conversion? Im trying to understand which would be a cheaper option to raise the floor . Floating floor or using celotex and screed

[@DP-bo4yw]

Dpm > insulation > polythene sheet > screed.

[@petronablessbless7589]

Great job guys i have learnt a few tips from your vedio, have to do my house as well thanks a lot for the update..

[@ConstructionwithKieren]

Thankyou for supporting the channel! Hope you enjoy upcoming videos👍🏽🧱

[@andyk7967]

Out of curiosity, do you know how much weight these panels can take once they have a screed cover on them? I want to put a large fish tank in a room with these under the screed, but I am worried it's just going to collapse!

[@ConstructionwithKieren]

You should be able to put any amount of weight on it mate Aslong as the concrete base is thick enough and the screed is also!👍🏽👍🏽

[@andyk7967]

@@ConstructionwithKieren Sweet! Cheers.

[@magdamazur1429]

thank you for sharing!

[@ConstructionwithKieren]

My pleasure!

[@MMG_MoonManGuitar]

Solid work mate. Making it look easy. 🔥

[@ConstructionwithKieren]

Thanks mate!!

[@chapsheating1006]

Good Video buddy 🙂

[@joyguan1476]

no moisture barrier?

[@ConstructionwithKieren]

Under the concrete

[@ConstructionwithKieren]

And then goes over the celotex

[@stephenjprice]

Hi there many thanks for the video What do you fit on top of the newly insulated floor or is it floorboards or can you put carpet directly on top of the insulation?

[@ConstructionwithKieren]

Stephen Price hi there, so we have 4 inch of concrete then 4inch of insulation which you can see in the video and then we have 70mm of floor screed. That’s when you put your carpet/flooring down ontop of the screed!👍🏽

[@SocialAnomaly88]

Lost me once the EDM started playing.

[@george4vIogging]

That's when I really got into it

[@jimmymorgan3324]

SHOULD OF. STUCK THEM DOWN. WITH SOMETHING. LIKE LEAD SEAL . , AND. TAPED THE JOINT.S WITH SILVER FOIL TAPE. WOULD HELP WITH THE. U VALUE. . NEXT TIME A .

[@Overfl00d]

WHAT IS U VALUE?

[@Overfl00d]

GOOD IDEA WITH SILVER FOIL FOR JOINTS

[@jimmymorgan3324]

s

[@waqqasanwar1912]

Insulation should be staggered, and any gaps between the boards should be filled with expending foam