Questions tagged [vapor-barrier]

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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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93 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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948 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 ...
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39 views

is there anything wrong with using plastic sheeting under joists in a dirt crawlspace area?

background info: old farm house crawlspace with exterior perimeter walls made from boulders and cement skimmed to create a fall surface. joists under the main living space have batting type fiberglass ...
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2answers
165 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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38 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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508 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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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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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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308 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
295 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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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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1answer
817 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....
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1answer
40 views

How can I add more insulation to my finished attic walls without trapping moisture

I have a finished attic that has a kneewall insulated with fiberglass batts, insulation facing in. The batts fill the depth of the wall cavity completely to the end of the stud, there's no more room ...
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15 views

Metal shed/roof/ with window air conditioner/insulation foam board

I have an un insulated metal shed. Both walls and roof are metal. I bought insulation foam board for the ceiling that has the shiny foil on one side. I have a air conditioner mounted in the wall ...
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35 views

Should I install a vapor barrier before adding drywall to my garage?

I'm refinishing my attached garage, and part of the job will be to install drywall. Currently, the walls have faced installation installed are are covered with pegboard. I'll be removing the pegboard ...
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12 views

How to find my IRC zone?

I'm replacing old insulation in a 1962 cape cod style house in the Baltimore area and trying to determine if I need vapor barrier. The more I research, the more complicated the answer becomes. The IRC ...
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243 views

What type of insulation do i need to replace in my AC air vent registers?

We noticed we had mold on our register grills due to one of our AC unit not draining anymore in the attic (water was ponding in the pan); we had a remediation company come out and they told us we ...
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28 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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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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2k 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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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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246 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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231 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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458 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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230 views

Replacing old windows - how to make vapor barrier?

I'm replacing a couple windows in an 80 year old house. Not surprisingly, there is no house wrap or any kind of vapor barrier. It's 2x4 studs with 1/2" tongue and groove wood siding on the inside, ...
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958 views

What should I do about the insulation in my basement?

So in my basement I have insulation that was put up by the builder. My first question is what is this type of insulation called? The second question I have pertains to finishing the basement. I plan ...
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1k views

Should I spread lime in my crawlspace before laying moisture barrier?

The crawlspace is currently just earth. I'm going to be raking it, laying moisture barrier and then taping to seal. Should I spread lime onto the earth before laying the barrier?
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1answer
3k 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
2k 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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1answer
417 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 ...