Vapor / Discussions

What insulation should I put on basement block walls that is resistant to mold?

...vapor barrier on the walls if that's where the moisture issue is coming from. If it's a poured concrete floor and it has no vapor barrier beneath then that will...

Posted by Ken Gee July 31, 2019, 3:25 p.m. Basements improvements 3 Responses

How do you fix high humidity levels in a basement?

...vapor barrier below the concrete floor, so even if you did insulate and seal the walls with a spray foam vapor barrier , it will likely continue to absorb moist...

Posted by JR Tadinac Aug. 21, 2019, 11:26 a.m. Healthy indoor air quality 3 Responses

Can you install foam boards directly against basement walls?

...vapor barrier) you would be ensuring that the wall cannot dry to the interior either, so what you would have is an ideal mold incubation chamber. If you are s...

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

Is the ZIP sheathing system good or bad for water control?

...vapor barrier paint here on our site or somewhere else? We tried it (we could because we did the exterior peel and stick membrane I mentioned above), it was par...

Posted by Trevor Prinz Nov. 26, 2019, 4:03 p.m. Walls and Roofs 4 Responses

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

...vapor barrier’ in residential constrution . So that would be sufficient for us, and if you get one with a foil membrane then it is even less permeable that XPS,...

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

How do you prevent walls from rotting in humid climates?

Hi there, we live on the gulf islands, building a new home as owner builders and figuring it out as we go. I worry that being in such a damp environment for so...

Posted by Rose Alderson Nov. 5, 2018, 4:34 p.m. Wall assemblies - new construction 1 Responses

How do you insulate a ceiling and finish it on the inside with wood?

...vapor barrier. And it sounds to me like you have something of a timber frame ceiling at least, which would give you room to insulate between the purlins or ra...

Posted by antonija klotz Oct. 20, 2019, 7:31 p.m. Roof assemblies - renovation 1 Responses

What is the best way to insulate the basement of an old house?

...vapor barrier, but I would put the vapor barrier right against the foam and do the poly on top. And as for finishing the floor afterwards, yes you can, but I’...

Posted by Bryan Squirrell Jan. 14, 2020, 7:59 p.m. Basements improvements 1 Responses

Can I add Larsen Trusses and cellulose to 1920s House in Minneapolis?

...vapor barrier on the outside of a building is not a wise. I’m wondering if perhaps you misread that? You should never put a vapor barrier on the exterior of a w...

Posted by Ken Traefald Feb. 17, 2020, 2:30 p.m. Wall assemblies - renovation 3 Responses

How do you insulate a crawlspace?

...vapor barrier on the warm side of the insulation, meaning between the joists before the insulation. And due to the stack effect, this air will also rise into th...

Posted by Drew Weistend Nov. 14, 2017, 9:22 a.m. Crawl spaces 1 Responses

How do I stop a leak from my attic?

...vapor barrier properly at the same time. It’s not necessarily an easy job, but once you remove the existing batts you could lay down a 6 mil poly vapor barrier ...

Posted by Markus Duess Feb. 11, 2019, 12:42 a.m. Roof assemblies - renovation 1 Responses

I'm looking at installing rigid insulation the exterior of My Double brick 1880s

...vapor barrier ’ I suspect you are writing from Canada? There’s no place in the great white north where you would want to put a vapour barrier on the outside of ...

Posted by Gordon CASWELL Dec. 13, 2019, 11:38 a.m. Wall assemblies - renovation 1 Responses

How do you build a mold-free basement in a new construction house?

...vapor barrier, or drywall just yet, so is it at the stage of wood only? Mold typically forms in basements when wood studs and insulation are sandwiched agains...

Posted by Charmaine Herzig Feb. 10, 2020, 7:32 p.m. Basements improvements 3 Responses

Followup to the question How do you install Larsen Trusses on a home in Minneapolis?

Perhaps my wording should have been, wrap the poly around the sheathing, then nail on the Larsen Trusses. My house like most in built in the early 1900's, has ...

Posted by Ken Traefald Feb. 27, 2020, 1:49 p.m. Wall assemblies - renovation 1 Responses

What is the best way to insulate the ceiling of my crawl space?

...vapor barrier. Generally speaking, we are fans of Rockwool (mineral wool) insulation in cases when you aren’t sure of conditions, because it is not harmed by mo...

Posted by Judy Mendel Feb. 17, 2020, 11:10 p.m. Crawl spaces 3 Responses

What is the best practice to insulate a crawl space floor?

...vapor barrier between your conditioned space and unheated crawl space below. If you only had a subfloor then it would be easy to lay down a membrane first and p...

Posted by austin Fanning March 16, 2020, 8:55 a.m. Crawl spaces 4 Responses

Can you provide Crawlspace Insulation Design Assistance?

...vapor barrier / vapor retarder products are a poly, foil is among the least permeable materials, I just want to make sure you are getting the kind of product yo...

Posted by Randy Christensen Dec. 10, 2019, 12:17 p.m. Crawl spaces 1 Responses

What is the best way to Insulate the crawl space of an old home?

I have a 120 yr old home with a dirt crawl space that is completely dry, no Mold in the entire home, has new windows and new insulation in the attic. I have st...

Posted by Aj Jan. 21, 2020, 8:13 a.m. Crawl spaces 1 Responses