Under / Discussions

Has anyone insulated under a swimming pool?

18' swimming pool, Northern Wisconsin, I can see Lake Superior from here, north. I would like to put 2" rigid foam boards under 6-7000 gallons of water to keep...

Posted by Randy Parent May 10, 2021, 8:28 p.m. Natural swimming pools and ponds 1 Responses

Have you excavated under one of your slabs middle of winter?

...under a slab, and no, you would not find frost under a slab we built. We engineer them and build them to meet the conditions of our climate. Our last demo house...

Posted by Mike Kolder Jan. 31, 2021, 2:31 p.m. Slab on Grade 1 Responses

Can you use spray foam Insulation under a slab?

Were building a new house and are wondering if you can insulate under slab with foam polyurethane. If not, why? When building a slab on grade, EPS rigid foam i...

Posted by Linda Martin April 6, 2020, 11:54 a.m. Slab on Grade 1 Responses

Is moisture a problem in an unvented cathedral ceiling under a vented attic?

...under a vented attic space in the same way we are concerned about moisture at the peak of an unvented attic space? There is nothing that jumps out at me as a pr...

Posted by Kyle Burgmeier Oct. 25, 2021, 11:06 p.m. Roof assemblies - renovation 1 Responses

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

...Under 2" Cement slab Roof for energy efficiency and water leaks? Maybe 2 layers? The base for the roof will be Metal beams. Thanks, Rafael, Brooklyn We would ...

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

Is it OK to put 1 inch of EPS under vinyl siding with no wall insulation?

...under floors. Walls have no insulation, siding is T-1-11 from the sixties would like to put 1 inch EPS under vinyl siding. the building is pretty well built. ...

Posted by Roger Smith Nov. 12, 2019, 6:34 a.m. Wall assemblies - renovation 7 Responses

What is the best exterior rigid foam insulation for under a deck?

...under our front deck, the hole for the foundation wasn't back filled so approximately 4 feet of concrete was left exposed with the sil plate. I'm thinking of ...

Posted by Andrew Cherubini March 21, 2021, 9:02 p.m. Insulation and soundproofing 3 Responses

Can you install tubing under a slab on grade foundation to extract heat in winter?

Can tubing for a ground source heat pump be put under a slab on grade prefab form foundation kit to extract winter heat? We generally recommend people check wi...

Posted by Jennifer Cole Aug. 28, 2019, 11:34 a.m. Slab on Grade 1 Responses

How do you remove water droplets from under a crawl space vapor barrier?

...under my crawl space vapor barrier? Water is acculating on the dirt side of the vapor barrier. If I crawlspace has water droplets forming under the poly vapor...

Posted by Paul Racioppo Feb. 7, 2020, 3:49 p.m. Crawl spaces 3 Responses

How do you prevent mold under flooring of a house on concrete slab?

...under cement but there is tar paper over cement. Replaced some tar paper water proof painted cement and installed vapor barrier installed furring stripes and co...

Posted by Linds Cullen Dec. 31, 2020, 4:11 p.m. Slab on Grade 3 Responses

How should I insulate under a concrete hydronic slab on stilts?

...underside will be exposed to cold winter air, so you will pay more for heating (or more for insulation), you are exposed to animals underneath, and houses on po...

Posted by Cam Smith Feb. 6, 2021, 12:21 p.m. Foundation choices 1 Responses

How do you stop wind from blowing under a house on piers?

...underneath if it is bare ground underneath. So since its a dirt underneath I would lay down a poly membrane before anything else. If you are looking to close ...

Posted by Robert Boyle Oct. 17, 2021, 12:11 a.m. Foundation and basement improvements 1 Responses

Which insulation should I use under my cottage?

my cottage is over a dirt floor, the foundation walls all in 2x6 and plywood, what type of insulation can i use on walls . and to point out the walls are sitti...

Posted by denis maurier May 3, 2021, 11:14 a.m. Crawl spaces 3 Responses

Why is there frost on the underside of my roof overhang?

...underside of the overhang roof deck and when the sun/temperature gets warmer there is water that drips through the tongue and groove soffitting. Please note tha...

Posted by George Paul March 23, 2020, 12:10 p.m. Roof assemblies - renovation 3 Responses

What can I use as an air barrier under an old wood floor with no sub floor?

This is an old house 1860 with 1910 addition. The old wood floors have no subfloor and on first floor, that is above a dirt floor basement. Since we have acces...

Posted by Mimi Costley Nov. 6, 2021, 11:11 a.m. Air and vapour barriers 1 Responses

Is a vapor barrier necessary under a concrete slab with foam insulation and if so, where does go?

...underslab vapor barrier from WR Meadows, we found it to be extremely puncture resistant and our final radon test showed levels under 20 becquerels, far lower th...

Posted by Grady 22 Aug. 17, 2019, 12:19 p.m. Air and vapour barriers 3 Responses

Is it smart to lay plastic under a pier and beam cottage and should I close it in?

...underneath, definitely lay down a poly membrane. If its open air underneath and not used as an air barrier or radon gas barrier , I would cut some slits in it...

Posted by b port Oct. 31, 2021, 3:19 p.m. Crawl spaces 1 Responses