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8
votes
2answers
17k 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 ...
7
votes
2answers
25k 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 ...
7
votes
1answer
645 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 ...
6
votes
3answers
6k 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 ...
6
votes
1answer
3k 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 ...
5
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 ...
5
votes
1answer
624 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, ...
5
votes
3answers
6k 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) ...
5
votes
3answers
3k 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 ...
4
votes
6answers
47k 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, ...
4
votes
2answers
2k views

What happens when a vapor barrier is too close to the cold side?

The vapour barrier must be installed on the warm side of the wall, that is on this interior side of the house. It is permissible to have it sandwiched in the middle between two layers of insulation, ...
4
votes
1answer
1k 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. ...
4
votes
2answers
4k 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 ...
4
votes
3answers
2k 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 ...
4
votes
2answers
1k 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 ...
4
votes
2answers
2k 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 ...
3
votes
3answers
579 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 ...
3
votes
2answers
8k views

How can I measure water/moisture content within a wall cavity?

Related to improper placement of a vapour barrier within wall insulation, are there any tools or methods for measuring water/moisture content within a wall cavity?
3
votes
1answer
290 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 ...
3
votes
1answer
734 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 ...
3
votes
3answers
5k 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 ...
3
votes
2answers
2k 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 ...
3
votes
1answer
1k views

Should I install vapor barrier in a seasonal cottage?

I am installing drywall in the bedrooms of a seasonal cottage in northern Ontario. It is unheated in the winter. The cottage is insulated with R14 insulation. Will the installation of a vapour ...
3
votes
1answer
308 views

Should I vapour barrier an (inside) sistered wall when the exterior wall already has it?

I have a 8' x 8' garage wall w/vapor barrier on warm side attached to house. This wall has 2 vertical duct runs. It had 5/8x drywall with fire stops insulated with R13FG batts except on the 2 duct ...
3
votes
3answers
37k 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 ...
3
votes
1answer
392 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 ...
3
votes
1answer
209 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,...
3
votes
5answers
18k 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 ...
2
votes
1answer
3k 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 ...
2
votes
2answers
145 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 ...
2
votes
2answers
112 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. ...
2
votes
1answer
500 views

How to attach plastic (vapor barrier) to the studs?

What's the best way to attach 4 mil plastic (vapor barrier) to the studs? I tried to use regular nails (sinkers 4d 1 - 3/8'') but the plastic sheet goes off the studs (through the head of the nails) ...
2
votes
2answers
15k 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 ...
2
votes
2answers
1k 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, ...
2
votes
1answer
151 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-...
2
votes
0answers
345 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 ...
2
votes
1answer
424 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-...
2
votes
1answer
135 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 ...
2
votes
1answer
245 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, ...
2
votes
1answer
110 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 ...
1
vote
2answers
2k views

Removing Tuck Tape from an unfinished window frame

The builder taped the vapour barrier to the window frames in my basement. Is this normal? I attempted to peal it off but the glue residue is stuck to the wood. Any suggestions on how I can remove ...
1
vote
4answers
21k 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
524 views

Additional Vapor Barrier with Faced Insulation?

When installing faced insulation into exterior walls, are there any benefits or detriments to adding an additional vapor barrier to either the non-faced side of the insulation?
1
vote
3answers
172 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 ...
1
vote
1answer
2k 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 ...
1
vote
1answer
1k views

Will installing an OSB floor in the attic create moisture problems?

I installed some new OSB flooring in my attic. The area it covers is about 160 sq. ft. The total area of the attic is about 750 sq. ft. There is just blown fiberglass up there, and there is no vapor ...
1
vote
1answer
31 views

Mending plastic sheeting behind sheetrock

My house was built around 2000, and seems to have plastic sheeting behind the sheetrock (I'm unsure what thickness plastic was used and what type of plastic; is there some sort of standard?) My house ...
1
vote
4answers
1k 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. ...
1
vote
1answer
3k 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, ...
1
vote
1answer
46 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 ...