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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What's a high R-value insulation material alternative to dimensional lumber

Years ago I read somewhere about a building material described like this : a composite/synthetic material (not wood) available in traditional dimensional lumber sizes (e.g. 2x4) rigid enough to have ...
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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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100 views

Can I remove the framed wall on the outside of my basement?

I have a 20 year old house (which is a basic colonial box). The basement has a standard poured concrete exterior wall. Against the concrete exterior wall, they framed a standard wood 2 x 4 wall, ...
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292 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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2answers
2k views

Do I need to replace soaking wet insulation resulting from a plugged A/C drain?

I had a company install an A/C evaporator unit on my existing heating system. A plugged drain caused the plastic pan inside the evaporator to overflow with water, which then ran out through the metal ...
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1answer
983 views

At what temperatures do pipe sleeves protect pipes from freezing?

Pipes start icing at 20ºF and below. Down to how many ºF do the foam sleeves protect the pipe? The foams I placed in my outdoor pipes had a 0.35" thick polyurethane foam surrounding them. This is a ...
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454 views

How can I prevent aluminum window frames from heating up when they're in full sun?

There is a room that has a window, the frame of the window is made of aluminum. This window is subjected to direct sunlight a long time of the day, which makes the aluminum get really hot, and start ...
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1k views

How do I insulate interior basement walls that are not against the exterior walls?

I'm in the process of building an office and family room in my basement and need some help with the walls and insulation. There is a perimeter drain in the slab around the exterior walls that ...
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98 views

How do I provide proper fire protection in this situation?

HVAC guys are running a vertical duct (supply and return) from my basement to my 2nd floor attic. It will run adjacent to an exterior wall and will eventually be enclosed in a drywalled-in vertical ...
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1answer
357 views

What kind of pipe insulation is appropriate for sun exposure?

I want to insulate a water line outdoors, where it will be exposed to sun. I expect that UV light will damage many foam pipe insulations over time. Is there a type of insulation that will tolerate ...
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2answers
1k views

How can I insulate the floor of a room above a porch?

I've been searching around for an answer or pointers on this for a while, it's possible I'm using the wrong phrases when searching! I have a UK 1930's built semi-detached house, Streetview pic before ...
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1answer
697 views

How do I raise my garage ceiling after spray foaming?

I'm starting to add central vac to my house, which mostly involves pipes in the garage. I cut a hole in the garage ceiling (drywalled) to check things out, and found there's an 18" up to the bottom of ...
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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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990 views

Worthwhile to insulate basement ceiling while remodeling?

I have an existing finished basement where I'm in the process of replacing an severely damaged plaster ceiling with drywall. I've got the entire thing open, and as it's an old house (1925) there is ...
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2answers
770 views

Is it a good idea to put 1/4" XPS under engineered floors?

We're pulling out the carpet in a room next to a room with hardwood floors. After removing the carpet and putting down the engineered floor, we'll be 1/4" short of the hardwood. Options: Use ...
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1answer
252 views

Should I have my old ceiling vacuumed before installing insulation?

My house (built about 1890) has no insulation in the roof and so I plan to put in insulating batts. There is a lot of old dust and a few possum droppings up there, and I have heard that the dust can ...
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1k views

Should I apply rigid insulation between existing basement framing?

I'm replacing wood paneling in my basement with drywall. There are 1x furring strips attached to the cinder block and covered with tar paper, and the wood paneling was attached to those strips. ...
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1answer
792 views

Reducing Attic Fire Risk

When I had my house built, it got cold and so we called the local power co-op energy savings expert to give us advice. One of the things he said was that we had the wrong kind of insulation in the ...
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2k views

How do I insulate around a gas fireplace without tearing it apart?

My home has a gas fireplace that we do not use very often. It is in a "bump out" on the back of the house. In the winter, cold air flows through the vents under the fireplace and if you feel the ...
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100 views

How can I air seal around a brick chimney with a metal flue liner?

We have a 1954 brick chimney that has a metal liner inside and is only used by the natural gas hot water tank. It's had fiberglass right up against if for guessing 20+ years. I'm air sealing the ...
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97 views

Can I install insulation on the ceiling of an old unfinished basement?

Can I install insulation on the ceiling of an old unfinished basement? I have a bungalow home with hardwood floors.
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1answer
82 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 ...
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1answer
113 views

What is the proper way to insulate a cantilevered bay?

I have two areas of my house which are cantilevered. One is a bay area which extends about 2'. The other is the bottom of a fireplace box (gas fireplace). I have placed two layers of R-13 (I think) ...
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1answer
41 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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1answer
94 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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1answer
312 views

Insulate and fill hole in wall that was for cables?

Great Stuff doesn't look ideal, since it's going to get a lot of sunlight on the outside, and Duct Seal doesn't say anything about whether it actually insulates. Also, the Duct Seal material safety ...
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4k views

Should I replace old blow in attic insulation with new roll out insulation?

I have attic filled with old grey blow in insulation. I estimate it to be 20-30 years old. I suspect that it causes a lot of dust in a house. Plus any work in attic would stir it and some will end up ...
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1answer
3k views

How can I install soffit vents from the outside?

When we moved into the house we live in there was literally no insulation in the attic. We have a 4 1/2 pitch roof. We live in Texas and our first electric bill in a 1450sf house was almost $500. ...
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1k views

How to choose floor insulation?

My question is about insulating the ground floor. I have a crawlspace under the floor which is vented and therefore quite cold (average temp in the winter is 4 °C and in the summer 13 °C plus ...
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1answer
235 views

How can I reduce the sound of water moving through a pipe?

Introduction I am re-purposing a room from a kitchen to bedroom. The room has a concrete-block built wall through which cast iron water pipes pass. Here is the approximate schematic neighbor | p | ...
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1answer
468 views

How to insulate sloped top of concrete block foundation?

I am planning to insulate the inside of my basement. I have a concrete block foundation. I am planning on going XPS board route, applied directly to wall with foam/tape on all the seams to make it ...
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2answers
7k views

What could be causing my bedroom to be so cold, and how can I make it warmer?

I live in a two story townhouse with a basement. This summer, they replaced the furnace and air conditioning unit. Last winter I put 3M film over the windows to help with drafts and it worked great, I ...
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What's behind my plasterboard?

We've just moved house, and I've never had to deal with plasterboard before. I'm in the UK, and the house is about 10 years old. My understanding was that behind the plasterboard would be a gap ...
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1answer
546 views

Insulating attic ceiling and looking for synthetic t&g ceiling boards

We have a 3/4 upper floor room that is in desperate need of a complete overhaul. The current ceiling consists of 2x4 ceiling rafters with a foam vent and perhaps 2.5" of foam insulation, then the ...
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Getting R38 in roof with 2x8 rafters

I was planning to use foil faced 2" polyiso plus an air gap, plus 5 1/2 rock wool, to get 13+3+23, or r39. But this is all between the rafters below the roof deck, and the polyiso is impermeable. If ...
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How should I insulate a cantilevered bay with plumbing, ducting, and electrical?

If you were faced with the following cantilevered bay, how would you go about insulating it? I can seal most of the wood air dams between joists with Great Stuff, but as you can see, there are two ...
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137 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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735 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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888 views

Rim Joist Insulation without a Sill Plate

I've seen a few similar questions but the answers don't add up... I would like to use some rigid foam insulation to insulate my rim joists. Here is the problem: everything I have seen shows putting ...
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502 views

Can I sheetrock over styrofoam on a garage ceiling?

I am buying a home with a detached garage that the original owner insulated. The garage is probably 25 years old. At the time of construction, 1" expanded foam was nailed directly to the rafters to ...
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2answers
930 views

Is it safe to run the oven without insulation around it?

My oven had mice in it and made a nest. So I took all the insulation out of it too look for the mouse. This was because it smelled like a dead animal every time I turned on the oven so I cleaned it ...
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5answers
14k views

How can I insulate my fireplace when it's not in use?

I have a wood burning fireplace insert, that is not currently being used. Now that it's cold in my area (27F), I've noticed that there is quite a draft coming from the fireplace. How can I ...
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2k views

Will insulating pipes shorten the time it takes for hot water to reach the faucet?

Ok, so I took a few weekends and totally insulated all hot water pipes I could get access to from the water heater. Now, I still wait approx 90 seconds for hot water to reach the farthest faucet from ...
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2answers
791 views

Is a thick, unvented hot roof a good candidate for spray foam?

Upon removing some drywall from an unvented hot roof I noticed two serious issues: 1) The roof sheathing is not a taped or sealed ply but a 2x8 T&G 2) There is no vapor barrier and the cavity ...
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4answers
4k views

Could insulation around copper pipes cause condensation problems?

Should you insulate hot water pipe (copper) located in an attic? I live in Louisiana, where it rarely gets cold. The plumbers insulated the hot water pipe from the tankless water heater. Now ...
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274 views

Insulation options for narrow ceiling space

I've got a flat roof ( wooden, sealed with tar and then roofing iron on top of that ) with a 30 cm gap between the ceiling. Not really enough for someone to crawl in unless skinny. There's no ...
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181 views

Will removing the insulation from an unfinished basement cause it to be a lot colder?

We live in upstate NY and the house has an unfinished basement. It's waterproofed with cinder block walls and a concrete floor. There is no framing, no drywall. However someone put up this hanging ...
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251 views

Why does my house feel colder in one area after installing blown cellulose insulation?

I recently insulated my flat roof with blown cellulose insulation. I installed two vents on the roof as well. The house used to warm up well at 72°F. In order for our bedroom to be warm we have to ...
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107 views

mold problem in basement

I had some insulation put on half my basement wall. Since then I have been having a problem with mold.I know my basement walls leak. Could wet insulation cause mold? If so is it bad mold. Alls I know ...
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2answers
5k views

Is it more effective to insulate the walls, or ceiling of an unheated basement?

We have a new house, well built, spray foam insulation, tight seals. My daughter's room is over an unfinished area of the basement and is COLD this winter. There are vents in the unfinished area, ...