XPS / Discussions

How should I install XPS insulation in a basement?

...XPS against the foundation and framing an interior wall inside of that. Option 1 is to piece the XPS to follow the contour of the transition to the narrower blo...

Posted by Ken Hunold Dec. 27, 2020, 7:22 p.m. Basements improvements 0 Responses

Can I purchase XPS made with HFOs?

...XPS insulation have switched blowing agents yet. So as it stands, any XPS rigid insulation board you purchase will still have an impact several hundred times wo...

Posted by Kate Noblio Dec. 14, 2019, 12:35 p.m. Insulation and soundproofing 3 Responses

Is EPS or XPS better for use in basement rim joists? Should faced or unfaced foam boards be used?

...XPS Foam Insulation & Styrofoam We always choose (and recommend) EPS over XPS due to the fact that XPS has much higher greenhouse gas emissions than EPS. So i...

Posted by Thomas Dispenza Sept. 8, 2019, 12:43 a.m. Basements improvements 6 Responses

What is the best way to install 5" of XPS rigid foam on interior basement walls?

...XPS rigid insulation. It’s a great product; we have reservations about the climate impact as XPS foam has high green house gas emissions , but finding used stuf...

Posted by Sean MacDonald June 14, 2021, 10:42 a.m. Foundation and basement improvements 8 Responses

What kind of foam board should I use to insulate rim joists in Wisconsin?

...XPS would be the alternative but I'm concerned with fire code rating. While XPS has a lower fire spread rating its not suitable for exposed inside walls. It wou...

Posted by Matt Kime Sept. 12, 2021, 10:31 p.m. Basements improvements 1 Responses

Should you seal all rods and penetrations for a radon barrier?

...xps foam panels on the interior basement walls? Yes, to reduce radon levels in homes and have an effective radon barrier, you would need to seal all holes protr...

Posted by D H Dec. 25, 2020, 9:08 p.m. Healthy indoor air quality 1 Responses

Can you use polyiso insulation on the exterior of a wall behind cedar siding on the west coast?

...XPS ? Polyiso starts to fall off in R value around 5-10C , but it's not a catastrophic failure, and given your use of Celsius and ‘West Coast’, I’m thinking you...

Posted by Iain Matheson Jan. 28, 2020, 10:38 p.m. Wall assemblies - renovation 2 Responses

How do insulate a basement slab that is sloped ?

...XPS and osb/plywood achored with tapcons. The problem here is that there's a significant slope to a central drain (4" at the lowest). I will be removing that dr...

Posted by Louis-François Lapointe Nov. 11, 2020, 10:34 a.m. Basements improvements 1 Responses

What is the best way to insulate embedded joists in a basement Montreal Home?

...XPS ridgid boards for the wall and floor. ( Top of slab) Whats the best approach. Thank you We advise against spray foaming any rim joists that are wet se...

Posted by Emil Idf Jan. 7, 2020, 8:34 p.m. Foundation and basement improvements 1 Responses

How do I insulate my half below grade basement?

...XPS with 4" studs and roxul insulation to give around r24 (local code). This is expensive and I'm not 100% on board because the basement is half above grade. ...

Posted by tom mckeand Oct. 14, 2019, 11:01 p.m. Basements improvements 1 Responses

Do I need to insulate under the footings of a frost protected shallow foundation?

Hello, I’m designing a FPSF in Southern Vermont (AFI 2300). I want to fully insulate the radiant slab by including 4″ XPS under the footings but this seems t...

Posted by Jon Piana April 15, 2019, 8:45 a.m. Slab on Grade 1 Responses

Should I install a poly moisture barrier before the rigid foam board against a basement wall?

...XPS foam board insulation held in place with the special plastic pegs (since the poly will not allow adhesive to affix it to the wall), blue sheathing tape on f...

Posted by DONandCATHY Crenna Dec. 14, 2020, 2:21 p.m. Basements improvements 3 Responses

How much insulation should I install underneath my concrete slab in my basement?

...XPS below a slab, the added R value of XPS just isn’t worth the added cost – meaning EPS is cheaper per R value, and XPS manufacturing has very high green house...

Posted by Scott Antonation Sept. 27, 2019, 1:06 a.m. Slab on Grade 3 Responses

What's the difference between EPS and GPS insulation?

While searching to purchase EPS boards, which are very difficult to find here in QC, I've bumped into a 4' x 8' x 1" thick board, called GPS. Do you have a web...

Posted by Ronald Tetrault Feb. 3, 2021, 5:22 p.m. Insulation and soundproofing 1 Responses

Is polyiso board or styrofoam best for insulating when finishing a basement in CO?

...XPS rigid insulation boards I have a few questions that will help us pin down the best way forward for you - How old is the home? Is there an exterior membr...

Posted by Evan B. Nov. 21, 2019, 8 p.m. Basements improvements 1 Responses

What is the best insulation Under 2" Cement flat Roof in NYC?

...XPS Foam Insulation & Styrofoam It's still a great insulation, just not quite up to the R6.5 + levels that were originally claimed. So the more 'energy savvy'...

Posted by Rafael Mor March 29, 2019, 5:19 a.m. Roof assemblies - new construction 1 Responses

Can Rockwool be installed over Type II EPS?

...XPS Foam Insulation & Styrofoam Sometimes adding XPS or EPS rigid foam to the outside of a house can cause problems since it can trap moisture. That said, it ...

Posted by Brian Bonnell March 30, 2020, 11:04 a.m. Wall assemblies - renovation 1 Responses

What is the best way to insulate my basement?

I have an unfinished walkout basement with 3 sides at or below grade. The two sides of the house have poured concrete step foundation down toward the rear with...

Posted by Chris Rogers Oct. 27, 2019, 11:23 a.m. Foundation and basement improvements 1 Responses