Foam boards / Discussions

Can you install foam boards directly against basement walls?

...foam boards against the wall THEN the stud wall, you don't want to have organic material exposed to moisture, particularly having a source of moisture on one si...

Posted by Ted Gorab Oct. 3, 2019, 6:09 p.m. Basements improvements 4 Responses

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

...boards for installation in my basement rim joists, should I be looking for faced or unfaced foam boards to install there--and which surface of the boards (faced...

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

Can you use Foam boards on basement walls to stop condensation?

...foam board and still be a problem? Hoping to just be able to apply foam to regulate the concrete temps and prevent inside warmer air from touching the concret...

Posted by Chad Johnson Dec. 21, 2019, 7:59 p.m. Basements improvements 3 Responses

Can Rockwool be installed over Type II EPS?

...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 is m...

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

What is the best way to insulate a crawlspace to keep humidity down and stop odors?

...foam boards on the walls, sealing the floor. There is no moisture only when I put a piece of plastic down. Just want to warm it up a little and keep away any sm...

Posted by Dave Bell Oct. 24, 2019, 3:57 p.m. Crawl spaces 3 Responses

What is the best way to insulate my basement?

...Foam Board Insulation over the bare concrete and leave the framed walls insulated as the are? 2. Install Foam Boards over the concrete and replace the foam in...

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

What is the best way to deal with a drop ceiling in a high humidity room?

...boards, then rigid foam insulation and then faced fiberglass batts and then plywood subfloor of the outdoor deck. The rigid foam was not sealed (no air barrie...

Posted by steve Roberts Dec. 24, 2019, 8:01 p.m. Walls and ceilings - interior surfaces 1 Responses

What is the best way to insulate a 2x8 wall?

...foam or 2 layers of 4" foam board not sure which kind would be best ......or spray foam and fill the rest with rock wool....it would be nice to talk to someone ...

Posted by Michael Sweglar July 8, 2020, 10:43 a.m. Wall assemblies - new construction 3 Responses

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

...foam the joist area while using XPS ridgid boards for the wall and floor. ( Top of slab) Whats the best approach. Thank you We would advice against spray ...

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

Do frost lines where studs are on a wall show a failure of spray foam insulation?

...foam rather than a failure. The wood studs will transfer far more heat than the Spray Polyurethane Foam (SPUF) , so what you are seeing could actually be an ind...

Posted by Gerald Crozier July 22, 2019, 10:24 p.m. Insulation and soundproofing 1 Responses

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

...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 membrane on the basement w...

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?

...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' bui...

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

How do I insulate my half below grade basement?

I am about to start a full strip out and rebuild of my basement to make a secondary suite. I've been reading all the information on the site and find it very u...

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

How to insulate an apartment you don't own?

...foam boards (learn which are best here) to the wall with a few tiny nails, holes that small are easily repaired when you move out. That would go a long way to m...

Posted by Teresa Cunningham Oct. 21, 2019, 3 p.m. Wall assemblies - renovation 1 Responses

Can you spray foam a house from the outside?

...foam with foil directly under the siding. Someone recommended removing the sheathing and doing spray foam from the outside. It seems we could also drill holes a...

Posted by Joan Lawrence July 11, 2019, 7:17 p.m. Wall assemblies - renovation 3 Responses

What is the best way to insulate rim joists with EPS and batts?

...foam boards will act as a vapor barrier and the thermal barrier. For an air seal, you may want to actually do that first, which could be a simple matter of appl...

Posted by Steve J July 18, 2019, 3:53 p.m. Basements improvements 1 Responses

What do I in my basement where new insulation meets old?

...foam them (like you it's not our first choice but it works) or you can cut pieces of foam boards and place them between the joists and seal them with acoustic s...

Posted by Steve J July 20, 2019, 10:01 p.m. Basements improvements 2 Responses

How do you fix radon and water infiltration in a dry stone foundation?

...foam, it will still insulate, so the risk of freezing is still there. Here is our page on choosing rigid insulation boards , you can see some options there and ...

Posted by john flannery July 14, 2020, 4:24 p.m. Foundation and basement improvements 5 Responses