Questions tagged [vapor-barrier]

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Removal of Plastic Vapor Barrier

Should the plastic vapor barrier be removed from under or replaced under exterior wall drywall? I am working on a house which had major termite damage. The house is located in a town in upstate New ...
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1answer
2k views

Is there any way to do an Ufer (concrete-encased) ground with a monolithic slab that has a vapor barrier?

If I understand correctly, when using a monolithic slab (where the footers and slab are poured as one piece), the vapor barrier is installed under the slab and the footers. The NEC does not consider ...
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2answers
241 views

Is hydraulic cement a vapor barrier?

I know hydraulic cement is designed to block the transmission of water, but does it also block water vapor to any appreciable degree that it is considered a vapor barrier at a certain depth/thickness (...
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1answer
284 views

Is it necessary to replace plastic covering pink insulation in bedroom exterior wall?

I'm doing a little project where I'm fishing some CAT6 cables from a 3rd floor bedroom to a second floor office. Because of the layout, I had to first fish the wire along an outside-facing wall before ...
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3answers
369 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
892 views

Vapor barrier above a frequently wet crawlspace?

How can I create a vapor barrier between my home and its crawlspace which frequently has standing rain water that must evaporate and drain? Some first floor rooms have smelled damp for years. I am ...
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1answer
245 views

How good of a vapor barrier is OSB in a dirt crawlspace?

Some background - I bought my current house in the middle of a drought in 2007, and knew nothing of vapor barriers. The house has a nice, albeit uneven crawlspace, that is walkable for about half ...
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1answer
104 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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1answer
145 views

What type of vapor barrier and concrete should I use for bare earth in basement?

I recently purchased a house built in 1937 that has had a number of additions to it. One of these additions was an extension of the house over the original foundation. This resulted in a small area of ...
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1answer
193 views

What is this paper/foil in between drywall and concrete block? Can I cut it and repair it?

I want to move an outlet so I cut out a horizontal stretch of drywall and found a layer of paper and foil. I assume it's some kind of vapor barrier. What I really need to know is, is it ok to cut it ...
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1answer
892 views

How do I insulate the floor under my shed?

I have a shed that has a wood floor laying on a steel frame, which is laying on some tiles on the bare earth. I would say there's roughly 30cm of clearance between the dirt and the floor boards. I ...
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1answer
246 views

Insulating existing basement wall

I'm getting ready to finish my basement and one of the rooms is already roughed in. However, the stud walls are 1/2 (give or take) away from the concrete. My plan was to insulate with fiberglass but ...
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2answers
2k views

Proper way to install subfloor in kitchen

I am remodeling my kitchen. I removed several layers of flooring. At the bottom there is some 3/8" ply. On top of that was tar paper and some 5/8" particle board. I removed everything but the ply ...
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3k views

double vapor barrier

I am constructing a mortar/cement board shower and i need to waterproof it. Is their anything wrong with using a plastic vapor barrier / pvc shower pan liner for the bottom layer and then also ...
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1answer
343 views

Do I need a vapor barrier for seasonal cottages

We have seasonal cottages in Parry Sound. We were wondering if there is a by-law stating that we are required to insulate and vapor barrier all exterior walls?
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171 views

How to Insulate Drop Ceiling Above Tiled Shower?

First post so bear with me... I am working on air sealing for my 1965 ranch style home in NJ, and noticed that the insulation in the attic above the tiled shower is black and brittle (kraft paper) ...
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2answers
3k 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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1answer
637 views

Is garage ceiling vapor barrier needed?

I am planning on insulating an older two car detatched garage that will be covered with half inch plywood. I am pretty sure it would be wise to put up a vapor barrier around the walls but do I need a ...
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1answer
290 views

Damp Crawl Space

My house is located in Missouri, currently I have a vented crawl space with a dirt floor. My home was built in 1998. I put a humidity tester in the crawl space and it reads anywhere from 75%-88% ...
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0answers
505 views

what is best vapor barrier for second floor bathroom on a concrete slab?

My question is about the separation of the bottom of the 2" concrete slab I'm installing as subfloor to my second floor bathroom, and protection of untreated wood beams and joists in 1876 house: I"ll ...
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1answer
292 views

Vapor Barrier Advice

My carpenter installed a metal bulkhead to box in some plumbing. My question is, how can I effectively install a vapor barrier here? I was able to insulate behind the bulkhead, but now the top plate ...
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0answers
26 views

Vapor resistant ceiling fixture installation

I am installing vapor barrier on a ceiling using poly, acoustic sealant, and a vapor-tight ceiling fixture (FN-426-C-V - pictured below). Note the ring of soft foam around the circumference of the ...
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1answer
1k views

How should I mend the plastic sheeting behind my drywall?

My house was built around 2000, and seems to have plastic sheeting behind the drywall (I'm unsure what thickness plastic was used and what type of plastic; is there some sort of standard?) My house ...
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2answers
216 views

Vapor Barrier for Wine Cellar

I am building a wine cellar, we have 3 1/2" of closed foam insulation. One wine cellar company says that I do NOT need a vapor barrier because a double barrier is a recipe for condensation and mold ...
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1answer
399 views

Vaper barrier for kerdi lined shower walls

I'm using kerdi membrane for my shower area with cement backerboard. Should I still add a layer of plastic vapor barrier behind the backerboard. Normally that's required to prevent the studs and ...
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1answer
74 views

Do I need a vapor barrier on an 8" pour + carpeting over tile?

So I am finishing my basement and the side I'm finishing has an extra 4" pour on it as well as old 8x8 asbestos tile. My plan is to carpet over it. Do I need a vapor barrier? I get that concrete is ...
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3answers
4k views

Do I need a vapor barrier on tub surround with 1 external wall?

I know variations of this question have been asked dozens times and it seems like there is no real consensus. Each post or website I look at seems to advocate something different. I understand that ...
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1answer
1k views

What's the proper way to flash an inside roofing corner, with self-stick membrane?

What's the proper detail to apply membrane or tar paper to an inside roofing corner, where a sloped roof meets a higher wall at a corner? Of course a metal flashing goes on top of of the membrane, and ...
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0answers
244 views

What Should I Use to Seal the Concrete Slab under the Joists?

I'm renovating a slab on grade half bath. I'm concerned about moisture/condensation forming under the joists. Should I seal/paint the slab? If so, what product should I use? Most of the products I've ...
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2answers
1k views

Running cable through vapor barrier

I have a manufactured home (2001 vintage) sitting on a crawlspace. (I.e. it has mortared cinderblocks around it rather than skirting.) The home has a vapor barrier attached to the underside between it ...
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1answer
453 views

Insulation and vapor barriers behind Corian/Greenboard shower walls

I've got a small bathroom that I am working on repairing/refinishing. I've removed the existing (leaky) shower and base and am replacing them with Corian-like materials (Kohler's Choreograph for the ...
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1answer
83 views

Should I add a vapor retarder to an interior cinderblock wall as part of my basement remodel?

I am currently in the process of finishing my basement and I want to know whether, in general, anything should be done to an interior cinderblock wall related to moisture protection. To show what I ...
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1answer
783 views

Do I need to repair a slit vapor barrier on fiberglass insulation

I am cutting holes in the ceiling to install IC-rated recessed lights and I accidentally slit into the brown paper lining of the underside of the fiberglass insulation. Do I need to repair the cuts ...
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3answers
23k views

Do you tape kraft faced insulation?

So I am going to use 12" R-38 kraft (paper) faced fiberglass insulation in my attic. I plan on face stapling the paper to the bottom chord of each truss. I imagine most of the seams sideways where ...
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1answer
1k views

Vapor barrier problems

Update: added some additional details below based on comments. I have a basement bathroom that I am currently working on. I've framed and installed rough plumbing. I have some vapor barrier problems ...
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1answer
140 views

Vapour barrier for basement garage ceiling

To make the floor of a bedroom above a garage warmer it is desireable to insulate the garage ceiling. Does a vapour barrier go up in the joists against the floor above since the house would be ...
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1answer
346 views

Attic insulation: Giving unfaced insulation a face

I just moved into a small 1950s home. The previous owner had purchased tons of unfaced fiberglass batts and they are still in their bags, piled up in the attic. So I'm going to clean up the little bit ...
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4answers
22k 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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2answers
587 views

Insulating between boiler room and bathroom

Part of my bathroom is directly above the boiler room. The boiler room is only accessible via an external door and is well ventilated with wall and door vents, so I consider it more like an outhouse ...
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0answers
68 views

Proper method to seal a heated crawl space

I have a heated crawlspace with a dirt floor. There are no vents, it is fully connected to the house, and currently has a pool liner and vapour barrier stretched over it, but it is not sealed. There ...
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0answers
230 views

Super-Insulating a Crawlspace

I am getting ready to have a contractor insulate my crawlspace. The exterior facing walls of my crawlspace are about 2" above grade, with the remaining 2 ft 6 in - 2 ft 10 in below grade. One of the ...
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0answers
307 views

Garage Wall Question- Insulation and vapour barrier?

We live in Vancouver, BC, Canada. We are redoing the wall that separates our house from the garage. The wall is built with 2 by 6's and has been insulated with Roxul R20 thermal batt insulation. On ...
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1answer
1k views

Should I install a plastic vapor barrier below the insulation between my ceiling and attic floor?

I'm redoing the insulation in my attic the floor/ceiling cavity and then the ceiling of the attic. I have 2 rolls of plastic that is 15 ft by 150 ft just sitting around -- I've had it for years. Is it ...
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1answer
79 views

Is there something I can do after not putting a moisture barrier between grade and concrete of a garage?

I built a 3 car garage 7 years ago. I didn't know at the time that I needed a vapor barrier between grade and concrete; Is there something I can do to keep the floor from being wet on a regular ...
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0answers
455 views

vapor barrier between sub floor?

A friend and myself are building a cabin in southern california. It doesn't snow often where it is located. The cabin itself is setup on a post foundation and we are almost finished with the subfloor....
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3answers
1k views

Is it okay to not have a vapor barrier in lightweight tiny house type construction?

So, I have a bit of an odd project. It is a bit outside of the box, and I'm looking for alternative approaches that stick with the theme (if the plan outlined below doesn't work, that is). ...
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1answer
2k views

Wisconsin Basement Finishing questions

Last year I decided to let my brother-in-law finish my basement. After he finished the framing he moved away. Now I have wood framing complete and nothing else. He claimed he knew what he was doing,...
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1answer
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Is it normal to notice underneath the plastic barrier in crawlspace drops of water?

A radon barrier was placed using 6mil polyethylene sheets and sealed with silicon in at the seams. However, I do notice in certain spots a couple of drops of water underneath the sheet. Is this okay? ...
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2answers
139 views

polystyrene insulation over dryloc basement walls

I am a DIY beginner. If I am installing polystyrene over drylocked basement walls, do I need a vapor barrier? Do I put the studs on top of the polystyrene? So, from exterior to interior it would be:...
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4answers
2k views

Best way to air seal, vapor seal, and insulate exterior wall in old house?

I have a 90-year old house in Seattle. Exterior walls are constructed as follows: lath and plaster, uninsulated 2x4 stud bays, plank sheathing, cedar clapboard, 1" foil-faced styrofoam, vinyl siding. ...