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Questions tagged [vapor-barrier]

Vapor barriers are used to limit how much humidity penetrates a home. This is most commonly done via kraft paper, adhered to in-wall insulation. Use for questions about installing it.

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Smart vapor retarder for retrofit preferrably sprayon/roll on

Does any one know if there are Smart vapor retarders for Retrofit purposes? Im needing to install from the outside of the house as the interior walls cant come down and the outside is needing to be ...
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Vapor barrier for walls [closed]

We have unfaced insulation for the walls. There is a debate if vapor barrier/retarder is needed. We are in Virginia with mixed climate. Should I do it? What should I use? I see paper and plastic but ...
Jennifer Murray's user avatar
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What kind of material/product can I use as a vapor barrier for insulation?

I'm adding insulation into a room I'm building here in the PNW. The insulation is unfaced R-30 fiberglass roll. The room is in an unfinished attic space with the ceiling, and two of the walls are ...
Helixdnb's user avatar
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Can I drywall directly over rigid foam insulation

If I apply rigid foam insulation directly over a wall and tape the joints, can I drywall directly over that? The wall is a combination of brick and 2x4. It was previously for an exterior room that ...
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Why is the right vapor retarder on interior wall so difficult to determine for a bathroom remodel?

I am doing a bathroom remodel, poly plastic vapor “barrier” was on the the outside wall under Sheetrock and on a part of the ceiling, it was not in the bathtub tile surround drop down ceiling I tore ...
Billyboy 's user avatar
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Vapor barrier (sheet) over concrete pad below ground level deck?

I've just finished the framing for a low deck that's partially over a concrete slab (see pics below). As you can see, there is minimal clearance under the deck for air circulation. I'm now thinking I ...
Texaus_76's user avatar
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Is a vapor barrier really necessary in crawl spaces in dryer areas (Colorado)?

We're looking at putting an offer in on a home in Northern Colorado. However, the home has had foundation work in the past and has notes on previous work that installing a vapor barrier to the crawl ...
MNeat's user avatar
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How to refinish this so mold doesnt reappear

Looking for some advice on how to refinish this half wall, mid way down my basement stairs so mold doesn't come back. This was strapped with a couple of horizontal 2x2's with insulation in between and ...
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How to repair small holes and tears in waterproof backing paper behind stucco

I’m remodeling the bathroom. The bathroom is by the exterior wall. When I pulled an uneven stud out, it dislodged some nails from plaster and caused some small holes and tears on the black ...
Chimichanga's user avatar
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Should there be a vapor barrier for between two drywall layers?

The noise from outside was really bothering me in one of the rooms in my house, so I decided to address it by installing additional layers of drywall on top of my existing finished walls, with ...
Emin Ozkan's user avatar
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Should I install an interior vapor barrier when an exterior barrier is present?

I have a wall on the first floor of my house that is very close to another building, but they are not connected. This wall has an exterior black vapor barrier in the outside and the sheathing is ...
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How can I prevent basement slab moisture from causing mold in flooring?

I live in a residential community built in the late 80s. I believe no vapor barrier was put under the concrete because when we switched from carpet to wood floors mold starting coming through after a ...
Julie's user avatar
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How to connect Vapor barrier to joists basement

I’m trying to figure out best way to connect Vapor barrier to the joists in a basement renovation. House is in Alberta Canada. 1970 build. The basement wall consists of a concrete wall with a pony ...
Paul's user avatar
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How should I insulate and block moisture in a floor over a crawl space?

Summary Planning to replace carpet in walk in closet. Pulled up padding and found 5/8" partcleboard as only subfloor. Ripped that out and have some 23/32 gp dryguard osb going in. Under the ...
meguy's user avatar
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Wondering about the need for a vapor barrier

My home is on a slab. There is a vapor barrier under the concrete. One bedroom is about 18 inches lower than the remainder of the rooms (the original owner/builder designed it that way). I am ...
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How to correct siding on a porch

A piece of siding on my enclosed front porch blew away in a recent storm. It made me realize 1) that there's insulation directly under the siding which seems, weird?? Is that normal? shouldn't there ...
Indigo's user avatar
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Can tile, cement, and grout rubble be used as fill under crawl space vapor barrier?

I am remodeling my bathroom (one of two) and was thinking how I can reuse the demolition debris instead of throwing it away. As one of my future projects was to encapsulate my crawl space, one of the ...
Bluebird's user avatar
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Vapor barrier along concrete wall

I'm turning a 20X40 ft pig pen into a woodshop. The pen has a 4ft concrete knee wall and then 2X4 framing on top of that to 8 ft. It has a 2X6 framed ceiling. The pen is on a concrete pad and entirely ...
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Remedy for Gap Between Water-Resistive Barrier Behind Vinyl Siding

In the last residing, the old wood siding was covered with green foam board as the water-resistive barrier and the new vinyl siding was install on top it. I know it was not a good practice in general, ...
bobby_yan's user avatar
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Insulating old house attic with lath and plaster ceiling

My attic has a bunch of cardboard spanning across the ceiling joists that a mix of loose fill and batt insulation rest on. I had to run electrical and cut through the cardboard to gain access. I'm ...
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Vapor Barrier possibly concealing leaks [closed]

Vapor barrier concealing leaks Hey there! I could really use some advice on those that have plastic sheeting in their ceilings. We just moved into a 1970s socal home in June. We have had numerous ...
Rachael's user avatar
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Radon and moisture mitigation when joists are on dirt

In this house in a dry climate, the floor joists are directly on dirt, and the floor boards are just one layer (no subfloor). After 150 years, there is no rot, and there has of course been substantial ...
Star Ford's user avatar
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"Smart" vapor barriers

.Hi, all! I've been working through insulating my kitchen. Had a drywall guy out who'll be patching all my stuff. He suggested that in his exp poly vapor barrier tended to create moisture problems. I ...
Zoinks's user avatar
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Fiberglass insulation above grade in basement

We have an unfinished basement that we want to finish. The walls are bare concrete and there is no subfloor. In the exterior, it seems there is a vapor barrier (we have the tar marks on the wall) . We ...
Daltoniana's user avatar
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How can I install vapor barrier to an exterior wall from the outside?

I am insulating the garage portion of the house inside my garage. I will remove the siding and fiberboard used in the 60s. There is no insulation in the house. How do I get a vapor barrier without ...
Richard Martinek's user avatar
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How can I insulate exterior stuccoed walls from the interior side?

I am renovating two rooms of an old house and have removed the interior lathe/plaster with the intent to replace it with drywall. The walls were not insulated. My plan is to insulate these walls from ...
Steve's user avatar
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1 answer
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Insulating exterior 2x4 walls, from inside

KS weather (zone 6) is always averaging 5°F in winter at least a few times, and always over 100°F in summer for 20+ days. I bought a manufactured home that apparently has 2×4 exterior walls. I ...
Daniel's user avatar
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1 vote
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Using a combo of 2x6 batts and 2" polyiso foam as vapor barrier inside of 2x8s?

I am in need of insulating 2x8 cantilever bays, under my kitchen, accessible through my basement. I was considering pulling up the cantilever OSB and then running plastic under, then putting 2x8 (7.25&...
Zoinks's user avatar
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2 votes
2 answers
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How do I vapor seal around a fireplace exhaust?

I have a fireplace exhaust going through an exterior wall. It is a double-wall one for a freestanding propane fireplace, with the supply air coming in the outer chamber. The wall has rockwool ...
gregmac's user avatar
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Basement slab water permeance and vapor barrier, and mold precautions?

. Hi, all! I ran a moisture test in my basement where you put some Calcium Chloride under a plastic dome for a few days, and then measure weight before and after. I came up with general permeance in ...
Zoinks's user avatar
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Can I use XPS insulation over poly sheet foundation waterproofing?

I recently had an internal perimeter French drain to sump installed along with a vapor barrier that directs water down into the French drain. Now I need to frame and get walls up. The piece I am ...
Garrett999111's user avatar
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What are the Best Practices for insulation, vapour barriers et al on a vintage RV with a single sheet galvanized metal roof. From the inside

Likely due to bearing heavy snow loads ( previous owner(s) ) The single sheet galvanized roof developed a few dips where water collects. When the water is deep enough it infiltrates around the edges ...
Charlene W Notelling's user avatar
1 vote
2 answers
1k views

Vapor barrier under shed floor

I'm purchasing a shed that I intend to use as a home gym. On delivery, the shed will be uninsulated, aside from the roof which is metal with a bubble underlayment. The floor is a single layer of ...
John Carter's user avatar
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What moisture barrier would I use in this specific situation in a basement bathroom for a shower?

I live in climate zone 4. It's hot in the summer cold in the winter. It can get pretty humid since we live near rivers. This is an exterior wall. The shower will touch the two studs that are attached ...
JuseCub's user avatar
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1 answer
2k views

Should I use a plastic vapor barrier on foundation walls? [duplicate]

I’m renovating my partially-below-grade guest room, and I currently have it stripped down to the cinder blocks. The only other part I’ve left in place are the vertical 1/2” plywood strips that are ...
SMCutter's user avatar
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Can I un-insulate my basement quickly, and refinish it slowly over time?

I live in MN, so, a very northern climate. The previous owners of my home insulated the belowground basement poorly. It is air conditioned and heated, but insulated with 2in fiberglass bats and wood ...
Nicholas H's user avatar
1 vote
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Replacing an old damaged lath and plaster wall and found wood plank walls under it. What type of vapor barrier is needed and how should it be applied?

We purchased an old house (1900s) that has lath and plaster walls. One of the interior faces of an exterior wall was badly damaged and the lath and plaster had to be removed. Under the lath and ...
Tia's user avatar
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2 answers
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How to paint interior of old uninsulated house

I live in a 70 year old bungalow with no insulation in a cold climate. The old paint is deteriorating, and there have been condensation problems. I believe the old paint is oil based and acted as a ...
QTX's user avatar
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Choice of tape for Kraft-faced insulation

I am preparing my home remodel for a HERS (Home Energy Rating System) insulation inspection. The design included a typical amount of over-engineering for new construction in California (Bay Area), and ...
5000fingers's user avatar
1 vote
2 answers
3k views

Would unfaced insulation with a plastic vapor barrier work better than faced insulation in a finished attic?

I am insulating my attic which will soon be drywalled. Is it better to go with faced insulation or unfaced insulation with 6 mil plastic sheeting as a vapor barrier? I live in Michigan (zone 5). Is ...
Brian Kalski's user avatar
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Should a vapor barrier go on before or after attaching furring strips?

I am installing furring strips to support drywall and I was wondering if the vapor barrier (planning on 6 mil plastic) should go before installing the furring strips or should it go on after the ...
Brian Kalski's user avatar
1 vote
1 answer
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Can I attach a vapor barrier directly to plaster, then install cedar tongue & groove?

I have a 1900 house that's never been insulated, and I'm putting in a new bathroom and kitchen. I plan to blow in cellulose insulation in most of the house walls. In the bathroom, I have a small space ...
Paul's user avatar
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Attic Insulation Retrofit with XPS Foam Board

I have an attic space in my house that has been converted into part of the interior envelope and is now heated. Unfortunately, the rafters making up the ceiling are only 2x6 and contain only R-21 ...
AlaskaChris's user avatar
2 votes
1 answer
1k views

Use of vapor barrier underneath a 3-season room

I have enclosed a screen porch with airflow underneath into a 3-season room. I have installed OSB over the existing pressure-treated decking, with the intention of installing ceramic tile over the OSB....
joetheDIYer's user avatar
1 vote
2 answers
3k views

How do I install a vapor barrier on the exterior of an existing wall?

In this answer, it states quite emphatically that the vapor barrier should be on the exterior side of the wall, outside the insulation. In this particular question, the OP is in Michigan. I'm just a ...
FreeMan's user avatar
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Fixing a drywall hole near shower

In trying to diagnose/fix a leak (details here), I cut a hole in the drywall near the shower. I found that immediately behind the drywall was some sort of barrier that was both rubbery and a little ...
Andrew's user avatar
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2 votes
1 answer
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Can I attach crawlspace vapor barrier over existing foam board on perimeter?

I have a very low crawlspace that i finally have access to while the floors have been removed. The crawlspace is vented freely and Former owner attached unfaced polystyrene boards to the perimeter ...
Ya Guy Godzilla's user avatar
1 vote
1 answer
67 views

Is there any benefit of a Vapour-barrier with gaps?

I'm installing fiberglass insulation to the floor of a cold loft. I've heard it is best to lay a vapour barrier first. The trouble is that it is a 1960's house with poor access. There is no chance ...
Buh Buh's user avatar
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1 vote
1 answer
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Vapor barrier under laminate in Florida humidity

We are converting a small building on our property to a mother in law suite. The concrete has a vapor barrier underneath of it according to my brother who saw it when jack hammering to install the ...
Kait's user avatar
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Is this mold growing behind duct tape that's holding vapor barrier to concrete foundation?

We put a vapor barrier down in our crawl space. Some parts of the perimeter were not completely sealed, so a few months ago, I used a clear duct tape to attach the vapor barrier to the concrete ...
K. Don's user avatar
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