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1answer
21 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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0answers
11 views

Best way to cover vapor barrier in crawl space for storage purpose

I just put in a 20 mil vapor barrier over a 300 sqft crawl space. I'm considering covering that to prevent any tearing while using this space for large-item storage with a relatively cheap flooring ...
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0answers
34 views

Floor insulation & vapor barrier for an (sometimes) climate controlled shed sauna

I have an existing 10'x12' wood shed on my property that I want to convert to have a sauna, changing room and small shower inside. Climate wise I'm in the Pocono mountains of PA. The shed is built on ...
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0answers
28 views

dangers of putting both mineral wall and rigid foam insulation back to back

I am thinking of putting in thick, class A fire-rated polyiso insulation in my walls and ceiling instead of drywall. As even the thickest insulation will not completely fill the cavities, are there ...
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0answers
26 views

Flat roof, polyurethane sprayed ceiling, holes in a air and vapour barrier

Ok guys, I really made a mess. I hired someone to spray my flat roof garage. I was going to put rockwool, but after researching those issues with flat roofs, i choose SPF closed cell. But it's not ...
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0answers
36 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
36 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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0answers
34 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 ...
2
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2answers
109 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 (...
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1answer
33 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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0answers
19 views

Is Sheet Vinyl a Good Moisture Barrier Between Concrete and Wood

I'm replacing the old nasty particle board vanity in my bathroom with a custom unit and doing tile on the floor and walls. The current floor is sheet vinyl rolled on a concrete slab. I'm creating a ...
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1answer
72 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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2answers
53 views

What type of interior vapor barrier is appropriate in the southern US?

I'm in the midst of a remodel in Austin, TX and I'm struggling to resolve the "right" way to go about insulation for exterior walls in this region. I'm generally familiar with the concepts of vapor ...
2
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1answer
175 views

How should I repair small tears in the kraft paper insulation caused while running a new water line?

While installing new electrical and water drops my wire snake (and pipe deburer) poked though and tore the paper face of the insulation above my bathroom. As this area is likely to see a lot of ...
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0answers
298 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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1answer
404 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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0answers
28 views

Sealing/Insulating Exterior Wall/Uninsulated Slab/Interior Wall

The corners of an interior partition wall were rotting and crumbling, and unsurprisingly, after removing the rotted drywall, I found that the metal sill is rusted, as well. The partition wall abuts an ...
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2answers
85 views

Remodeling garage to include an attic storage area for gutter supplies

Garage is 22'x 22', I removed the 2x4 rafter ties that were spliced and on 4' spacing , replacing them with a 22' 2x6 every 2'adding a knee wall on each side creating a 10'W x 20'L x 5'H at the peak. ...
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0answers
90 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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1answer
131 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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2answers
543 views

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 ...
1
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1answer
399 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
122 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 (...
2
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1answer
63 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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2answers
98 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
264 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 ...
2
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1answer
94 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
60 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
62 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 ...
0
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1answer
119 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 ...
0
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1answer
294 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 ...
1
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1answer
87 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
614 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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2answers
668 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 ...
0
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1answer
114 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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0answers
106 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) ...
1
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1answer
307 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 ...
2
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1answer
199 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
207 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 ...
1
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1answer
178 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
20 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 ...
1
vote
1answer
372 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 ...
0
votes
2answers
135 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 ...
0
votes
1answer
156 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 ...
0
votes
1answer
62 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
1k 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 ...
2
votes
1answer
674 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
158 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
410 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 ...
1
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1answer
344 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 ...