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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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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6k 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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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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244 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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546 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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9k 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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2k views

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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564 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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45 views

How to seal the exposed top of glass block windows

My basement has some glass block windows, that seem to be improperly (or not-optimally) installed. See picture.... As I understand it, there should has been a perimeter channel attached to framing, ...
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133 views

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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1k 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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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 ...
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563 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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229 views

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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2answers
1k 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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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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3answers
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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882 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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469 views

Most bang for buck approach to insulating home

My home is a bit over 100 years old, wood frame aluminum siding house, that was not very well kept up by the previous (30+ year) owner. We've lived in it for two years, and are looking to improve the ...
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3answers
1k views

Is there any reason not to use a radiant barrier in the attic?

i am considering putting up a radiant barrier in my attic, with a product like AtticFoil, to 1) reduce the attic temperatures as my A/C ducting is in the attic and 2) to reduce heat convection into my ...
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4answers
5k 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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2answers
2k views

How useful is double-glazed glass for sound and heat insulation in a semi-tropical climate?

I'm located in Bombay/Mumbai, and I've been trying to figure out what windows I should install for soundproofing and heat insulation. I was talking to someone who does consultation for uPVC windows. ...
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245 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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320 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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110 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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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, ...
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How should I insulate a bedroom in the attic?

After doing lots of research and reading lots of different opinions I would like to know what is the best way to insulate and vent a 1 1/2 story house that has a bedroom upstairs in the roof/attic ...
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3answers
958 views

How do you calculate if it's worth it to insulate?

We live just north of NYC, and the house was built in 1906. We're putting on a new roof and trying to figure out if it's worth it to insulate too. It's a cathedral ceiling on the inside, and we do ...
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2answers
938 views

How to best insulate an exposed waterpipe during the cold season

i have an exposed (out of the ground) water pipe and during the night freezes over. What is the best way to insulate it so it does not freeze?
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2k views

How can I reduce heat transfer around my window unit air conditioners?

I have three old window units in my house and they function as my A/C. I am concerned about the amount of heat seeping into the house and cool air leaking out around the A/C units themselves. They're ...
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2k views

IKEA recessed lights: extreme clearance requirements?

I'm finishing the ceiling on my basement. I'm planning to insulate the ceiling with the Roxul Safe'n'Sound Fire & Soundproofing Insulation. It is 3 inches thick so it only occupies the upper 3 ...
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391 views

insulating exterior walls

I have an old house with no insulation. The walls are 2x4 with plaster and lath. The outside is aluminum siding, in good shape. I would like to blow cellulose insulation inside the wall cavities from ...
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159 views

Is it dangerous to use polyisocyanurate without covering it with drywall?

I would like to glue sheets of polyisocyanurate to one basement wall which is very cold in the winter. Due to plumbing and electrical panels, I will not be able to cover the polyiso with drywall. Are ...
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191 views

What's the right approach for insulating the slab & footings underneath a masonry fireplace/heater?

The fireplace will be located in the middle of the concrete slab (away from the foundation stem walls) so it will have its own footing. My impression is that footings should rest on soil & gravel ...
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1answer
658 views

What do I use to fill in the crack between the wall and floor of my tiled bathrooms?

Yesterday I had an energy audit performed on my home which revealed sever leakage of air from the floors in both my bathrooms. The inspector told me to fill the cracks but was vague as to what would ...
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819 views

Can I re-fluff blown-in fiberglass insulation with a cellulose blower?

I am planning to add blown-in cellulose (GreenFiber) to my 15' x 40' attic, which currently has blown-in pink (circa 1971) which has really settled/compacted. A lot of it, I can actually pick up in ...
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638 views

What can I fill a trench around my house with to avoid creating a drainage issue?

I am planning out my footing insulation job. Right now it's a pretty standard floating slab-on-grade with footings extending down a few feet, and the footings are uninsulated. A ring of concrete was, ...
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143 views

How can I reduce how much a flat roof heats my house?

My flat roof is insulated with wool, but still it's heating up my room considerably. The situation is much better in the rest of the house. Any ideas how to do a quick fix? The roof is currently ...
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How can I measure the r-value of a wall?

What is a reproducible test to measure the r-value of an exterior wall? Or even a specific spot on a specific wall? It needn't produce an absolutely certain result, but a good estimate with known ...
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1answer
6k views

Can a new ceiling be build directly onto an old one

I would like to build a new ceiling on to an old slightly sagging and poorly finished ceiling (peeling paint and no joint plaster used). I see this way as more convenient and less messy than ripping ...
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3answers
32k 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 ...
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5k views

How should I use heat tape?

I've been considering using heat tape this year, to protect my pipes from freezing. Are there any suggestions for the proper use or installation of heat tape, or pros/cons?
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1k views

Why am I getting condensation on the first floor joists of my new build?

We're building a new house in New Hampshire. We insulated the 1st floor joists with batting last winter so the minimal amount of heat we had in the basement to prevent the foundation from cracking ...
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1answer
2k views

Easiest/Cheapest way to improve insulation of a room

I have a home office, which has 2.5 walls that border the outside of the house, and a floor that is over the garage. It's a nasty combination. It gets quite hot during the part of the day where the ...
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2answers
256 views

Should I think about insulating a cheap conservatory? if so how do I do it?

I made an offer on a house today that had a cheap upvc conservitory on the back on the house. The conservatory had a cheap plastic sloping roof on that leaked a little, the walls are very thin, and ...
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288 views

Check heating pipes for thermal leaks

I would like to check basic thermal leaks of the house heating system (and perhaps the house thermal insulation as well). As the professional services or equipment (thermocamera) are very expensive, I ...
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82 views

Can I add more insulation to my attic?

I currently have pink fiberglass bats in the attic. I wanted to add blown in insulation. My attic space is a bit unique. I'm used to a moderate sized attic that you can access. This attic has no ...
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1answer
56 views

Best insulation to adhere to back of door leading to attic space?

In the closet of an upstairs bedroom, there is a door about 3/4 the size of a normal door that leads to an unheated attic space. It gets pretty chilly in that closet during the winter months, since ...
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62 views

Covering attic baffles with plywood instead of drywall

I have these newly spray foam insulated baffles with 2x6" rafters, and I would like to cover them directly with plywood (for aesthetic reasons) rather than drywall. Is that an issue with fire ...
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52 views

Best way to hold interior wall insulation in place prior to drywalling

I'm insulating the interior walls in my house with rock wool insulation for sound proofing. I'm having drywallers come in to drywall everything in one fell swoop and the insulation needs to be in ...