Questions tagged [vapor-barrier]

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2answers
32 views

Should I put a moisture barrier between a single ply of pressure treated (PT) plywood and a second non-PT ply when constructing a shed?

I am building a shed. The floor consists of 4x4 PT runners, 2x8 PT girders, and 3/4" PT Plywood flooring. Anytime in the past, when I have laid PT lumber next to non-PT lumber, there is mold/...
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2answers
21 views

Vapor barrier on heated entertainment shed

i am building an 8x10 entertainment shed with a loft for kids to hang out and have sleepovers in, i will be heating it. I have tyvek and t1-11 it is on 4x4 skids on top of the Concrete patio and has 3/...
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1answer
11 views

Is Fiberboard sheathing under cedar siding ok with no vapor barrier?

I am patching horizontal lapped cedar siding on a 1950s house in Minnesota with fiberboard sheathing. I think it’s Nu-Wood. There’s no vapor barrier. I will have to put a vapor barrier per code where ...
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1answer
57 views

Are glass textiles with PTFE coating used as vapor barriers for installation under the roof?

In construction in Central Europe are in use vapour barriers, in special cases more precise as vapour retarders. These enable the drying of building materials such as insulation, if moisture has ...
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2answers
123 views

If I have vapor barrier under joists in crawlspace, is hardwood underlayment a problem?

I have spray foam under the subfloor with vapor barrier. The foam is sprayed to the underside of the subfloor deck, and vapor barrier is attached to the joists bottoms between the joists and the soil ...
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3answers
73 views

Can a vapor barrier follow the profile of floor joists?

I'm renovating the 4th and top floor of a house built in 1906 in Rotterdam, the Netherlands. The house has masonry load-bearing walls and wooden beams. The current situation is shown in the image ...
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1answer
353 views

Basement insulation in front of vapor barrier

I am getting ready to finish my basement. We have lived in the house for 7 years, never any moisture or water issues in the basement. It currently has pink insulation from ceiling to 12" above floor ...
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1answer
2k views

Exterior wall vapour barrier behind shower install?

There is discussion of vapor barrier behind a shower at this question, and many recommend not to have a vapor barrier behind the backer board if you are using a membrane on top of the backer, as it ...
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1answer
1k views

Insulating a 3 season room with no crawlspace access

I have a small room off of my kitchen that appears to have previously been a back porch with cement blocks as its foundation. I already re-insulated the walls and ceiling, but there's still obvious ...
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3answers
62 views

Suggestions to hold floating laminate floor from sliding on vapor barrier installed over concrete slab

I need suggestions for keeping a laminate floating floor in place during installation on a vapor barrier over concrete. I was hoping to hear of good ideas to prevent this slip/slide effect on the ...
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2answers
62 views

How to insulate metal roof on shed and avoid condensation?

I’m fixing up an old uninsulated shed. The roof — built of metal sheeting on plywood, nailed to the 2-by-4 rafters — needs to be insulated. What is the best way to insulate the roof that avoids ...
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3answers
97 views

Humidity levels in new basement are high

I'm currently living in a new build in Ottawa Ontario for which I took possession in February 2020 ( I've been here for about 5 months ). The humidity levels in my basement have gone gangbusters in ...
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3answers
85 views

Densheild tile backer board use advise needed

I'm in the process of doing my bathtub walls and I'm thinking of using Denshield™ boards. My total area is 55 sq ft. I found 4'x8' Denshield™ sheets so I will need to buy two sheets to cover my area (...
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1answer
39 views

Must we install a “moisture, not vapor” barrier, room-side, on an insulated above-grade portion of an exterior basement wall [closed]

Must we install a "moisture, not vapor" barrier, room-side, on an insulated above-grade portion of an exterior basement wall Can we forgo installing any " moisture, not vapor, " ...
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0answers
25 views

Vapor Barrier Under Insulation on Attic Floor

My brother tore out the mdf tile ceiling of his cottage and nailed down ~1x6 pallet wood on top of the ceiling joists in the attic. There are large gaps in the boards. On top of the boards, he rolled ...
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1answer
34 views

Faced or unfaced insulation

So my house was built in 1957, I have shiplap siding and behind black boards that are fireproof. On the photo you can see the exterior wall where these boards are. Should I use unfaced insulation or ...
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1answer
39 views

Vapor barrier on Bathroom tub exterior wall(s)?

So I keep seeing conflicting answers on this. I'm renovating a bathroom that was torn down to the studs. On the exterior wall I have siding-tyvek-plywood sheathing-fg insulation inside studs. My plan ...
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1answer
690 views

Should I use a plastic moisture barrier underneath a new deck to help prevent rot?

Our deck was 12 yrs old a lot of rot and we have torn it out. My husband is thinking of putting a plastic moisture barrier underneath the new deck. The deck is on a slope and consists of an upper ...
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0answers
22 views

Can rigid insulation be added to attic space over a plastic vapor barrier in a 100 yr old home

This is a century home and we are trying to restore as much as possible.The attic has a plastic vapor stapled to the rafters and some spots it jus hangs exposing the wood. would it be wise to staple ...
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2answers
4k views

How do I install a vapor barrier and insulation in an existing floor?

I have a large room in my house that is built over a crawl space. The floor of this room does not have any insulation installed in it. I live in upstate New York so it is my understanding that I ...
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1answer
490 views

Should I use a vapor retarder in Missouri?

I'm constructing a small house in southern Missouri, climate zone 4. My question about vapor barriers is multifold: Should I install a vapor barrier at all? Should it be on the interior (warm-in-...
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0answers
23 views

Outside Sauna Build Moisture control any suggestions?

I am currently building an Octagon sauna that will double as a mobile bug out shelter that will be mounted on a trailer. I'm putting the octagon on edge if you can imagine so that when viewed from ...
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2answers
95 views

Insulating against brick in rim joist bay

I was hoping to air seal and insulate the rim joist in my basement. This is a balloon-framed house in zone 5, so the bays are open to the floor above. At some point brick and mortar were put in the ...
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0answers
978 views

Another Question on How to Cover Up Exposed Insulation in A Basement Ceiling

I have read through many questions with a similar problem, but different circumstances than I have regarding this issue. The home is in Ohio so cold winters and hot summers built in 1997. I have a ...
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3answers
286 views

How Do Houses Prevent a Water Buildup in the Flooring?

I have been reading Canadian Wood-Frame House Construction to get an idea how houses are built and function, and am really confused about one aspect. External floors are built just like external ...
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2answers
48 views

Deal with humidity in Garage with no vapor barrier

My garage slab has no vapor barrier and I live in Houston which is often wet and almost invariably humid. Water seeps up through the concrete and humidity is always pretty high in the garage. Power ...
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3answers
87 views

Redoing insulation in the basement of the home I recently purchased

I recently purchased a home and have begun to do renovations on the basement. I am starting to look at insulation and so I have been researching what the best way would be to do that. The problem I am ...
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1answer
58 views

Can I install Insulation board in the interior wall with House wrap on the exterior

I am insulating a shed as a wine cooler. I have house wrap on the outside. I will install unfaced batt insulation between studs. Can I then install foam insulation board under the drywall? I am ...
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1answer
388 views

How should I prepare a log home for vinyl siding?

I am going to side over a log home. Some of the logs are deteriorated and the maintenance has not been done for years but for the most part the logs are solid. I want to fur out the logs with 1 x 4 ...
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2answers
103 views

Crawlspace encapsulation

This past weekend I recently had to fix the flooring of my family cottage. In a heavy-traffic side entryway, the plyboard floor was bending when you walked over it. We opened up the floor to see ...
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1answer
28 views

Fireplace/brick foundation

I'm rebuilding my garage and have planned to install a footer, full brick base, and full brick wall behind a wood burning stove. I'm planning to have the "base" be mostly standard concrete block with ...
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1answer
81 views

With a vapor barrier installed, how critical is slashing/destroying faced insulation underneath?

After installing a vapor barrier, forgot to slash/destroy the faced batts of insulation within some wall cavities and/or ceiling areas. Am I in "OMG deep doo-doo" for not slashing the batts, or ...
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4answers
20k views

Install plastic between drywall ceilings and rafters?

We are building a new house and are getting ready to install the drywall on the ceilings. We have installed a 6 mil plastic barrier on the underside of the rafters to act as an air & moisture ...
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8answers
142k views

What are the pros and cons of adding a vapor barrier behind shower backer board?

After much research, I have a lot of conflicting advise about the need to add a vapor barrier before installing the backer (hardy / cement) board for my bathroom shower. The "expert" at Home ...
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1answer
61 views

Can the vapor barrier between a dry floating concrete slab and linoleum flooring be foregone?

I have a two year old house that sits on an 8" concrete floating slab. The slab is insulated below and around the side. The floors in the house are unfinished. That is, the concrete slab is ...
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2answers
80 views

Concrete vs suspended floor over vapor barrier

Our house has a sizable crawl space large enough to use as storage. The space has no slab covering it, but due to radon issues, it does have a vapor barrier to maintain a suction for the radon ...
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0answers
32 views

Unfinished basement in Georgia townhome; would vapor barrier on interior trap moisture?

I have a town house that is a middle unit on a slab. The back wall is above grade, with exterior windows and door. The sidewalls abut adjacent units, so there is no wall in contact with soil for the ...
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2answers
72k views

Do I need a vapor barrier in an exterior basement wall if I use purple drywall?

I purchased some purple drywall (mold and moisture resistant)for installing in a finished basement bedroom. One wall is an exterior wall. Do I need to install a vapor barrier between the drywall and ...
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2answers
31k views

How to properly insulate a garage?

I'm considering insulating (and drywalling) my garage, which already has insulated garage doors. My main goal is to keep it from getting much below freezing during the winter. This garage is located ...
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2answers
1k views

plastic vapor barrier on basement ceiling - is it optional?

I have a finished basement where the builder added a plastic vapor barrier between the fiberglass insulation and a suspended ceiling. It is stapled to the joists. The problem is the vapor barrier ...
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2answers
2k views

How to deal with upside-down insulation?

I'm considering buying a house, but in the crawl space, they installed the insulation like you would from the inside -- by stapling it in using the kraft paper. Of course this means that there is ...
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2answers
218 views

Installing in-wall speakers in an exterior basement wall

I've been debating installing in-wall speakers on an exterior basement wall for a home cinema, and I see problems with every solution. Naive approach Cut out a section down to the concrete and ...
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1answer
14k views

What are my vapor-barrier options under Hardie siding?

I'm currently in the process of replacing all the siding on my 1940s home. It was originally wood dutch-lap and that was covered with felt paper and asbestos siding. I'm taking all the siding off, ...
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1answer
524 views

Vapor barrier behind electrical panel?

My electrical panel is mounted on bare studs of an exterior wall in my attached garage (living space above). The garage is not insulated and it does not need to be (except for the ceiling which will ...
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1answer
95 views

tearing out tub/shower surround

I live in Vancouver, and my condo is about 25 years old. A couple of the tiles in the tub/shower surround are cracked, and I know that when I take them off I'm going to find soggy drywall. I'm ...
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0answers
113 views

Vapor barrier for foam + Roxul

I am renovating my basement in New York. I have 2" thick r10(5x2") Owen Corning rigid foam board insulation covering the wall and Roxul 3" comfort batt insulation between wood studs. My contractor ...
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1answer
243 views

Attic Fan Box Vapor Barrier

This past weekend I installed a ceiling fan to replace an already existing light fixture. I had to replace the plastic electrical box from when the home was built in 1992. I am unable to get into the ...
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5answers
105k views

Should I install a vapour barrier if I'm using rigid foam insulation?

I'm re-insulating a room in my house from the inside. I've read that polyisocyanurate (polyiso) rigid foam insulation is the best R-value, so I plan on using that. Details: The house was built in ...
2
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0answers
91 views

garage vapor barrier

I am converting my garage into a wood shop and have insulated my walls with faced R13 insulation.The ceilings have faced R13 installed with R30 unfaced additional to the R13. Do I need to install ...
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2answers
1k views

plastic sheeting under monolithic concrete slab

I'm trying to figure out how to put the vapor / moisture barrier under a monolithic concrete slab. Do I just put the plastic down and drape it over the form, and then cut to ground level when done (...