Questions tagged [vapor-barrier]

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349 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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2answers
100 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
17 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
50 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
53 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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1answer
311 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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3answers
221 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
131 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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1answer
942 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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2answers
41 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
42 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
68 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
95 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
27 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
59 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
18k 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
132k 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 Depot, ...
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1answer
59 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
72 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
31 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
67k 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
29k 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
839 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
179 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
12k 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
358 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
90 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
110 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 ...
1
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1answer
178 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
95k 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
90 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
745 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
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
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2answers
173 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
950 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
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 ...
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2answers
97 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
939 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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1answer
756 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
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1answer
180 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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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 ...
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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 ...
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3answers
3k 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
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1answer
94 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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1answer
210 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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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
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2answers
667 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 ...