Questions tagged [vapor-barrier]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
3
votes
1answer
2k views

Are there any special steps when installing drywall over vapour barrier?

I have a simple (I think) question about installing drywall overtop vapour barrier. Obviously the drywall screw will puncture the vapour barrier. What is typically done to prevent that puncture ...
2
votes
2answers
204 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 (...
1
vote
1answer
1k 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 ...
7
votes
2answers
1k views

When insulating with closed-cell Spray Foam, what ERV and HVAC resizing considerations should I bear in mind?

I am building a 2800 sqft, two-story brick home in Austin, TX. I have heard many good things about the benefits of insulating with closed-cell Spray Polyurethane Foam (ccSPF)1, and have requested ...
2
votes
2answers
118 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
votes
1answer
1k 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 ...
1
vote
1answer
794 views

Can I use a vapor barrier paint instead of polyethylene sheets to encapsulate my crawlspace?

I was looking into "encapsulating" my crawlspace by some manner or other. From what I can tell the way to do this involves (primary) some thick poly (.15 or more) along the the soil and up the walls....
2
votes
1answer
211 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 ...
0
votes
2answers
1k 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
vote
2answers
3k views

Should I install a vapor barrier on the bottom of my garage ceiling?

I have a house that has a garage below the main floor. The house is built into a hill, and so the entry way, the basement, and the garage are all on the same level, and the entry way has a stair case ...
0
votes
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 ...
2
votes
1answer
135 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 ...
0
votes
1answer
276 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?
0
votes
2answers
2k 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 ...
2
votes
2answers
788 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 ...
0
votes
1answer
165 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
votes
1answer
129 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
votes
1answer
747 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
vote
1answer
207 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 ...
1
vote
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 ...
1
vote
3answers
19k 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 ...
0
votes
0answers
159 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
vote
5answers
44k views

Do I need a moisture barrier between my bedroom and attic?

This is related to my other question about moisture barriers. There is an attic above the bedroom and there is insulation with paper backing in place. The attic area seems far more likely to get ...
1
vote
1answer
577 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
votes
1answer
281 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% ...
5
votes
2answers
3k views

Should I add a vapor barrier when re-siding?

I am removing the siding on my house in Montana, which was built in 1964. From inside out I have sheetrock, 4" studs with R-11 paper backed fiberglass insulation and gypsum board sheathing. I want ...
1
vote
1answer
876 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 ...
1
vote
0answers
427 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
vote
1answer
260 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 ...
1
vote
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 ...
1
vote
1answer
656 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 ...
0
votes
1answer
133 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 ...
0
votes
2answers
212 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
2answers
953 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 ...
2
votes
2answers
516 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 ...
1
vote
1answer
432 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 ...
3
votes
5answers
60k views

Should I put vapor barrier only on exterior wall of a bathroom?

I've been searching around the site and haven't found an answer for my question on where to place a vapor barrier so I'm hoping to get a little more clarity here. Basically I'm in the home stretch of ...
1
vote
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 ...
2
votes
0answers
925 views

How should I seal and insulate a crawlspace to mitigate radon and allow for storage in the space?

Background: I recently bought a house built in 1996. It has a 1480sq ft (approx) living area, which is the same as the crawl space size. The location is in the Kansas City metro area. The yard is ...
0
votes
1answer
346 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
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 ...
0
votes
1answer
316 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 ...
0
votes
0answers
222 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 ...
0
votes
1answer
80 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 ...
1
vote
1answer
921 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 ...
1
vote
0answers
63 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 ...
5
votes
3answers
14k views

Installing bathroom exhaust fan: what to do with vapour barrier and insulation?

I'm adding a bathroom exhaust fan, which is being mounted in the ceiling of the bathroom (in the attic) and venting out through a vent in the wall. right now, there is a vapour barrier (paper) ...
0
votes
0answers
207 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 ...
0
votes
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). ...
1
vote
0answers
294 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 ...