Questions tagged [vapor-barrier]

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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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1answer
82 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
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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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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3answers
15k 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) ...
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229 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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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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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
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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3answers
16k views

What is correct vapour barrier method for bathroom ceiling in a bungalow in Canada

I am in the middle of a complete main floor bathroom gutting and re-finish job in my house in CANADA.. and WINTER IS COMING!!!! THE BACKGROUND (pics below): My bathroom is 5'x 13' in a bungalow with ...
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934 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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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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2answers
21k views

Should I install a moisture barrier behind drywall in house with T1-11 siding?

My home interior walls are thick redwood paneling in the bay area mountains. i'm about to start removing the wood in my second bedroom and want to install a moisture barrier on the 1 outside wall of ...
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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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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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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. ...
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1answer
1k views

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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3answers
4k views

Is the lack of a vapor barrier in the attic causing my mold issue?

For the last couple of days we have noticed more and more mold growth on the ceiling throughout the house. Wondering what was going on, I climbed into the attic this past weekend and notice that no ...
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2answers
3k views

Vapor and moisture barrier for “above ground” basement

I'm finishing the basement of my home in New Jersey, and I'm a bit confused about the general guidance for basement moisture and vapor barriers. My "basement" is built from concrete block. However, ...
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2answers
71k views

What type of tape is used to seal vapor barrier seams?

If I was installing vapor barrier in Canada, I'd use Tuck® Contractors Sheathing Tape. However, after a trip to the local Home Depot (USA), I came up empty in my search for Tuck Tape. I did find ...
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1answer
2k views

Can I use a 5 mil blue tarp as a moisture barrier over a dirt floor in a crawl space instead of poly sheeting?

Can I use a 5 mil blue tarp as a moisture barrier over a dirt floor in a crawl space instead of poly sheeting?
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3answers
311 views

How should I insulate the ceiling between floors in a ski cabin?

I have a small ski cabin in upstate New York (cold climate) that we only visit on weekends. It is heated by a wood stove. During winter we had many problems with bursting water pipes so they are now ...
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1answer
3k views

Do I need vapor barrier to insulate a cinder block garage?

Similar to How to properly insulate a garage? and https://diy.stackexchange.com/questions/31028/do-i-need-a-vapor-barrier-between-the-insulation-and-finish-wall-in-a-new-garage both of which do not ...
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1answer
11k views

What kind of insulation should we put under new tin roof?

We live in an old long leaf pine farmhouse that has no insulation in it. We are going to be putting a new metal roof on the house. The attic of the house was made into living space and so there is ...
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1answer
288 views

Vapor barrier for room next to garage?

I'm finishing a room that was built between the house and detached garage. I know I need to put 5/8" drywall for fire protection after insulating the wall. Do I also need vapor barrier? If so, how do ...
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228 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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1answer
723 views

Do I need a replacement attic vapour barrier after asbestos removal?

I recently had our Zonolite vermiculite asbestos professionally removed. The company used a large vacuum truck to remove it. They also ripped out the 6mm plastic vapour barrier in the attic. They ...
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1answer
104 views

how do I build a 7 to 9 inch high water dam?

how do I build a 7 to 9 inch high water dam? In wet weather, water gets into my house. I need to create a berm of earth that will be grass covered, and it should also have a water barrier to keep the ...
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2answers
2k views

What are my insulation options around a shower?

I'm remodeling my bathroom and shower and I'll be replacing the insulation on the external wall. This wall is the "back" of the shower (opposite from where the water supply lines are). With this in ...
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1answer
730 views

Where to locate moisture barrier in engineered hardwood floor sandwich placed over insulation board?

I'm planning to install an engineered hardwood floor on a concrete slab that is very very cold. The climate is northern New Mexico. The slab perimeter is not insulated, and doing so is cost-...
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1answer
1k views

Crawlspace Vapor Barrier Overkill?

I am about to install a vapor barrier in my damp Atlanta, Georgia area rental home. I plan to seal it about 3 feet up the poured concrete walls and overlap and seal all seams essentially creating an ...
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1answer
296 views

Do I need a vapor-barrier for laminate if my current floor is raised off a concrete floor?

My basement was finished in the 50s or 60s, including a real white-pine hardwood floor. It's raised off the concrete floor by nominal 2x4s as furring strips. The floor has seen better days, and for ...
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3answers
10k views

What are the pros and cons of a vented vs unvented crawl space?

I find it very confusing to read and hear conflicting advice on crawl space: vent vs air seal, different ways to do insulation, vapor barriers vs not, etc. Mine currently has some moisture and has ...
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1answer
467 views

How do I seal a vapor barrier on my basement walls if I have none from the floor above?

I am redoing my basement and was wondering how to seal the wall vapor barrier if there is no existing vapor barrier from the floor above. Or is it better off not using vapor barrier ? I am from ...
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1answer
1k views

How do I deal with vapour barrier for central vac inlets in exterior walls?

I'm retrofitting a central vac system, and it will be easiest to put a couple of the inlets in the exterior wall between the garage and the house (the vacuum itself is going in the garage). One ...
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1answer
4k views

Should I install vapor barrier in my basement bathroom?

I have a brick house built in the 1920s. I'm installing a bathroom basement based on an existing layout, but I'm trying to keep the "wet" side (mechanical room with hot water heater, etc.) physically ...
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2answers
131 views

Recommended method to insulate a raised (joisted) floor in the UK?

We're just about to get a new wood-burning stove fitted with an external air feed and have a load of squeaky floorboards which need fixing in the same room, so we're planning on taking the floor up. ...
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1answer
351 views

Can I install Delta-FL in only part of a basement?

I've been looking at finishing my basement and am leaning towards using 7/16" OSB over Delta-FL for the subfloor. I was also considering leaving some areas as bare cement (laundry room, utility room, ...
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1answer
1k views

What is good advice for a beginner layng insulation?

Background I have a manufactured home from the 70's with metal siding, wood studded walls and fiberglass insulation on the inside. I had a clogged gutter, which caused water to run behind the siding, ...
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2answers
2k views

How do we repair vapour barrier after a flood?

We recently had a flood in our basement which was completely finished. We have two bedrooms down there which is why I want to make sure it is fixed properly. When the restoration company came in to ...
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1answer
193 views

Should I use a vapor barrier when repairing a portion of the wall?

I'm replacing sheetrock 2.5' up from subfloor in remedy to mold issue. Does it make sense/provide benefit to put up a vapor barrier for this portion of the wall? The sheetrock that remains is foil-...
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1answer
489 views

How can I find out if a vapor barrier is requried for finishing a basement to code?

I'm planning out a basement finishing project, and I'd like to do it correctly. I've done a lot of research but what I can't tell is if I do, or do not, require a vapor barrier. I was hoping from a ...
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1answer
9k views

How do I retrofit a junction box in an insulated wall?

Typical cold climate construction: Drywall, 6mil vapour barrier, fiberglass batt insulation. How do I retrofit a junction box and maintain the vapour seal? To be clear, by 'retrofit', I mean the ...
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1answer
5k views

What is the purpose of a vapor barrier?

I live in southern Brazil and I don't really know if I need a vapor barrier, mainly because I'm still confused about its purpose. The house in question have brick exterior walls and interior drywall. ...
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1answer
292 views

How do I install vapor-retarder underlayment paper under vinyl floor planks?

Do I overlap the sheets of paper or are the seams supposed to lay flat against each other? Is it okay to use nails to hold it down, or does it have to be stapled? Can I use silicone to seal the seams?...
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2answers
5k views

What can I do in this vented crawlspace to keep the room above warmer?

I've recently moved to a new home. This home had an addition that was built on top of a Crawlspace that is vented to the outside. Needless to say, the morning after the first cold night made me ...
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3answers
12k views

Is torn kraft paper vapor retarder in the attic a problem?

I'm adding additional insulation in my attic. Unfortunately, I tore the kraft paper vapor barrier of the existing fiberglass insulation in many places while air sealing. Is this a problem? Or is this ...
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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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2answers
3k views

What should I do about this possible mold I found under paint?

I live in Austin, Texas, which is important in that we don't receive much rain, and it's not very humid. I was peeling paint off of the old drywall, and found what appears to be mold on the bottom of ...