Insulation is any material used to slow the transmission of heat or reduce the transmission of sound. Typical materials include fiberglass, foam, blown cellulose, and reflective foil. This should not be confused with weather stripping.

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Do I leave this insulation up?

I am researching how to finish one room in my basement, and not sure what to do with what I think is vapor barrier or wall wrap insulation. Its only on two of the four walls which I assume is because ...
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28 views

How can I repair a bathroom fan under garage that is leaking in the winter?

I have a rigid metal exhaust pipe coming out of the bathroom fan over my downstairs bathroom. It goes up at approximately a 30 degree angle for about twenty feet and stops just before it gets to the ...
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205 views

Can I block a skylight during summer without condensation?

I have a small fixed skylight and figure that during winter it's no problem to block the tunnel at ceiling level as suggested by an answer to a similar diy.stackechange question. (The only difference ...
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38 views

elegant attic hatch design for several purposes

My attic hatch measures roughly 2' square. Presently, it has insulation on top of the hatch door (in the attic). Because some of the hatch sticks up above the insulation on the floor of the attic, ...
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138 views

Can rigid foam board have an air space between it and rim joist?

I am insulating my rim joists with 2" rigid foam board. Most of the rim joist is bare, and the foam fits along it nicely. Some sill boxes have some small irregularities (vent pipes, plumbing, etc) ...
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48 views

How do I dry up a stucco wall that presents efflorescence?

I have determined the source of the water and I would like to believe that I stopped that with a temporary fix (a large tarp that will cover my patio which used to collect water at the base of the ...
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438 views

Can I install insulation over the HVAC duct work and plywood?

Currently there is R19 faced insulation installed between the floor joists. I am adding R30 unfaced perpendicular to the currently installed R19. I have two questions: 1) There is an HVAC unit in ...
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97 views

Insulating and reducing boominess of plywood subfloor

I have a plywood subfloor in a ground floor extension that is laid directly on the joists. The current floor is half solid wood tongue-and-groove laid on top of green fibre underlay and half fake ...
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217 views

How can I vent my roof without removing drywall?

I have a finished attic, that needs to be updated. The pitched sides of the roof are sheetrocked & insulated, the ceiling is a suspended ceiling (will be sheetrocked) and the low knee walls are ...
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36 views

Thermal Mass Puzzle I Can't Figure Out

I live in Los Angeles and have 2 units on my property. I use the front one as my office. I had the floors done years ago and thought I would get tile and have a subfloor of cement put in so that I ...
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66 views

Where do I need to insulate my house to help avoid ice dams?

We have had some leaking this past winter due to ice dams. After we get everything dried out, we would like to put up some insulation to help prevent this in the future. Is insulating the ceiling ...
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29 views

Best way to stop boiler steam from entering attic

I have a cape cod. The boiler is in the basement and vents to the outside about a foot above ground level. I get a considerable amount of snow melt and ice buildup in the attic section directly ...
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33 views

How can I stop my windows from leaking when mild winter weather occurs?

We have an 11 year old bungalow and this problem only occurs on the middle section of a bay window. We think that frost happens inside the insulation somewhere and when the temperature outside is mild ...
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152 views

Cost of XPS panels vs. sprayed closed cell foam

I'm starting the process of finishing my nearly full height (7'2") basement and am costing out the insulation. Based on my research of what's best below grade, I'm debating between XPS foam panels ...
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31 views

What is the best way to subdivide and heat a large room?

I live in a large room and would like to subdivide my room, such that it can be heated with a space heater/small mobile radiator. I live at the end/corner of a large L shaped room, with concrete ...
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40 views

What could cause moisture on my bonus room floor?

Last week during a cold snap with high winds. I discovered moisture along the floor on one side of my bonus room, above the attached garage. Their was enough moisture that the baseboard molding ...
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231 views

How can I insulate and elevate an A/C line set on a flat rubber roof?

The Scenario An apartment building with a flat black rubber roof. The A/C condenser is on a platform on the roof with an air handler inside the unit. The line set runs across the roof for about 20 ...
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51 views

How can I insulate an already converted attic space?

A couple of years ago we had our attic converted to a spare bedroom, It became obvious after the first winter that there was a problem, after inspection it was confirmed that there is no insulation ...
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132 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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58 views

How do I attach windows to a block wall covered with rigid foam insulation?

I'm wrapping a block wall house with rigid foam insulation. I plan on liquid nailing it directly to the exterior block wall of the house. I plan on attaching furring strips with tapcons on top of the ...
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92 views

How can I insulate a combo basement/crawspace?

I live in Louisville, Kentucky, so we have relatively cold winters (nighttime lows consistently below freezing) and relatively hot, humid summers (daytime highs consistently in the muggy 90s). My ...
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56 views

Does this count as a material alteration or repair for code purposes

Ontario Building Code, 2012 Except as provided in Section 3.17. of Division B, Section 9.40. of Division B and Part 11 of Division B, if an existing building is extended or is subject to ...
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644 views

How can I insulate brick exterior walls in a 100 year old house with wood beams in brick pocket floor supports

My sister has a 100 year old or older home over a wet and damp crawl space on an island which has high tide and rain water flooding of streets an crawl spaces. A sump pump runs all the time. The home ...
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333 views

Should I install drywall or plywood above a drop ceiling to increase the insulation value?

I am currently insulating a new room in my house. I am planning to put up a drop ceiling. I have insulated between my roof trusses. Do I need anything else between my drop ceiling and attic space ...
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371 views

Do I need to add a protective layer to insulation for wall heater?

I am going to install a 4000 watt wall heater to an add on. It is the kind of wall heater that is seated in the wall. i also plan to install insulation in between my wall studs. there will be ...
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126 views

Whats the difference between metal and plastic insulation support fixings?

I am putting 30mm of fibre insulation on a party wall and then covering it with 12.5mm soundbloc plasterboard which will then be skimmed. Does it matter whether I use plastic or metal insulation ...
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25 views

How to re-insulate between roof and top floor?

The space between my roof and the ceiling of my 2nd (top-most) floor is barely enough for me to crawl in. The roof tapers down to either end of the house from that, making the outer reaches ...
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28 views

Can i replace the existing screed on concrete slab with floor insulation and electric underfloor heating?

Can i replace the existing screed on concrete slab with floor insulation and electric underfloor heating ? Standard screed thichness is something like 50 mm to 80 mm or so. My idea is to replace the ...
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32 views

what is air permeability of silicone caulk?

What is the air permeability rating of silicone caulk? (say, GE Silicone II). I see that at building science there is a listing of various building materials and their permeability ratings, but it ...
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61 views

How can I stop an in-the-wall air conditioner from leaking air into the home?

As far as I can tell, the air conditioner fits nearly perfectly in the hole, but there is considerable air leaking into the home through the bottom. I think it may be because of metal strips that line ...
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42 views

how to fix the dry wall inside of the outer wall ? and what is brown glossy paper in between drywall and insulation? ?

I just found a mold in the bottom corner of my house inside of outer wall. I cleaned mold with bleach and cut the corner. is there any specific way to fix the dry wall of outer wall. Also plz what ...
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28 views

basement wall insulation

just bought a house the basement is below grade and the walls are all most finished needing one more sheet of drywall all the way around. im worried about the way they finished the insulation they put ...
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79 views

Should I add an air return in my basement and seal old vents?

My question is basically a variation of two prior questions: "How do I close and seal an old external vent" and "Should I add an air return in a finished basement." My house has a bottom level that ...
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135 views

What are my options for my chimney? (Ventless fireplace, insulation)

When we moved into our house it had an original chimney (now about 40 years old) but the original owners had converted the once-wood-burning brick fireplace into a ventless gas insert. I immediately ...
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74 views

How should I insulate a 12x24 metal shed?

I am having a 12X24 metal shed delivered today. Wood floor of course with studs to the ceiling. Am adding an air conditioner to use when in this work shop for furniture making. Was wondering how to ...
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30 views

Fiberglass insulation in basement

How effective is fiberglass insulation for interior wall separating basement living area from furnace room?
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73 views

What is the minimum thickness of an insulated bathroom wall

I am trying to build a basement bathroom in the corner of the house. Where I am, basement insulation codes are R10/13. What is the minimum that I can do to frame and insulate a wall. The two ...
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88 views

Bathroom remodel - Insulation/vapor barrier behind tub surround question

I am renovating my bath and my tub surround says it should be fastened to the studs. With this in mind my 1923 building has serious insulation problems and I would like to add R value as well as some ...
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79 views

How to insulate this portion of split AC Pipe?

I bought a new Hitachi split AC lately which isn't cooling as much I was expecting. I checked for leaks/bad installation and found this. (This is connection point of external pipe and pipe which ...
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97 views

Insulation of Basement Block Wall and Framing

In finishing part of my basement, we've gone ahead and installed 3/4" rigid insulation (R-3.8 IIRC), and then 2x4 framing against the rigid insulation. Then, the small gaps with between the 2x4 ...
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404 views

Can I run heat tape on my water pipe behind drywall without hardwiring?

In removing the ceiling tiles in renovating our basement, it came to my attention that the first 5 feet or so on water supply line has heat tape on it. While we've had no problems with it freezing ...
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330 views

Is it safe to fill in or insulate the space in my walls around my fireplace flum?

Moved into a new home and I noticed something about my fireplace. I have a large brick enclosure that surrounds my wood burning fireplace and when I was up in the attic I noticed that the space ...
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48 views

Minimum covering of brick wall for insulation purposes

There is a brick wall in our condo that is part of the exterior building that was never meant to be used as an interior wall. We were hoping to insulate it and we saw recommendations for using XPS ...
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99 views

How can I prevent my garage soffit vents from pulling in sewer vent smells?

My garage has a ceiling with fiberglass insulation over plastic air spacers leading to vents under the roof shingles. There is no plywood or drywall over the insulation. The walls are insulated and ...
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184 views

What thickness Styrofoam should be used to insulate a toilet tank?

So, based on my question here, I like the idea of insulating the inside of the toilet using Styrofoam because it seems more interesting/fun than installing a mixing valve. I plan to use silicone caulk ...
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0answers
79 views

Can a false ceiling improve insulation?

My new house has a very small kitchen which is actually an extension of the house with its own roof. I suspect its roof insulation is old and not effective, because this kitchen is quite cold (12 ...
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194 views

Is it possible to insulate existing ducts without removing drywall?

My second story is always warmer in the summer and cooler in the winter than the ground floor. I've had the ducts cleaned and sealed and I've also adjusted the blower motor speed. It occurs to me that ...
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246 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 ...
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0answers
261 views

Do I need a vapor barrier between the insulation and finish wall in a new garage?

Can I put plastic between the insulation and finish wall in a new garage? Or would we gain anything by doing this? We have some who told us to do this and others who say definitely do not. There is ...
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197 views

Can i replace the insulation in my stove/oven with any kind?

I need to replace the insulation in our oven/stove. Do i have to buy specific insulation?