DIY R-39.3 Foam Board Installation For vaulted ceiling and flat roof

[@paulhume8083]

From the UK. I've just discovered your channel and subscribed. Good luck with it all.

[@GreatScottHomes43]

Thank you so much! Hope you get to experience the rest of the project with me!

[@seankelly1291]

That is a super great point. About the potentisl of roof leaks with spray foam. Never thought of that. Great point!

[@GreatScottHomes43]

kept me up at night when I was about to pull the trigger on a spray foam install, I actually just had a issue with my chimney and everything worked as planned, was able to identify a leak.

[@CamIarrobino]

nice videos. i'm located south of Boston. couldn't agree more on spray foam. i refuse to put it against roof sheathing / in a roof cavity

[@JonathanCamargo-cw9hd]

I'm currently installing the Sika RMAX 2 in boards and tried all kinds of diff approaches to cutting it with little mess , even tried the Bullet Tools Centerfire FoamBlade CC52-1507 7.25 but found that a sturdy razor works best Most important thing to note when using a utility knife, have a fresh blade and do multiple passes until you fully cut through, it's super quick and very little dust ; my favor blade so far is OLFA LA-X 18mm Utility Knife

[@GreatScottHomes43]

sweet, yeah that long blade is probably great, and you wouldn’t have to snap the product so it’s all probably coming out nice. I just already had that insulation knife around and once I realized it worked pretty good I never looked back.. the very long blade of the insulation knife also allows me to use it as reference and get a very nice straight cut.

[@jhippl]

I use the Bosch foam jigsaw blade to cut this kinda stuff, it works out great. Also how are you addressing the thermal bridging on the rafters that aren’t covered in insulation?

[@GreatScottHomes43]

A forth layer across the face of all the rafters would have been ideal, but it would have left unwanted air gaps in between. Also at the end of the day it’s an added cost, going to be a rental unit, and consumed more precious head room.

[@GreatScottHomes43]

Is that the one that looks very similar to the insulation blade I was using?

[@jhippl]

@@GreatScottHomes43 yep that’s the one it basically turns a jigsaw into an electric version of what you did

[@dr.emilschaffhausen4683]

How will this impact the life of the shingles over time?

[@GreatScottHomes43]

Fantastic question, I spoke with several local roofers and they all said it’s a perfectly fine installation as long as it’s a similar installation to spray foam, no ridge and Eve vents. They also had no concern of the shingles experiencing higher temps and all said the temp really wouldn’t be all that different with a vented assembly and doesn’t affect warranty of shingles.

[@dr.emilschaffhausen4683]

@@GreatScottHomes43 Thanks for the quick reply!

[@GreatScottHomes43]

@@dr.emilschaffhausen4683 you got it, consider subscribing, would be much appreciated. So much to come