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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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
838 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
638 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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2answers
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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2answers
1k 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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1answer
374 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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1answer
94 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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2answers
42 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
362 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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2answers
551 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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2answers
142 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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4answers
3k views

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
5k 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
25k 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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2answers
4k 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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1answer
953 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
1k 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
241 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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2answers
279 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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1answer
27 views

How are thermal (fire) barriers installed over foam insulation in a crawlspace?

I will soon be sealing my crawlspace with plastic sheeting across the floor and up the concrete walls. I plan on then adding rigid foam insulation. My reading of the Residential Code is that I will ...
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2answers
192 views

Is it difficult to work around cellulose installation?

I am a new house owner since July of 2014. I bought a 50 year old house with good bones and a great opportunity to flip it. My attic has a pathetic R5 insulation at the moment. Being a young home ...
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2answers
446 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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2answers
1k views

How should I insulate this basement wall?

I've been doing a lot of reading. I live in Maryland, not particularly cold. We have an 8 foot ceiling in the basement which is poured concrete built in 1973. Only about a foot is above grade. I've ...
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2answers
148 views

spray foam personal protection

I have a closet in the master bedroom of my home that is on an exterior wall. Unfortunately there's no insulation on the back wall of the closet and so a lot of heat escapes. We keep the closet door ...
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2answers
161 views

How can I get the maximum light while avoiding heat from a window?

I have a west facing window. How can I get max light while avoid any heat coming from it?
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1answer
307 views

How should I mount external hardware to a Greenboard/EPS exterior wall?

The external cladding of my house is rendered NRG Greenboard (an EPS product). What is the best way to mount simple external hardware (specifcally, a hose reel) to this material? The reel itself just ...
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1answer
2k 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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3answers
7k views

What is a good solution for hiding insulation in an unfinished basement?

First off, let me note that I am a tenant in this house. My landlord lets me do small improvements, but I'm not going to finish the basement with drywall myself. Basically, we have an unfinished ...
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1answer
660 views

Could space above a drop ceiling and below sound absorbing insulation increase echo in room?

Our builder has asked whether we have any objection to his laying sound insulation on top of the suspended ceiling he's going to install, rather than attaching it to the actual ceiling above. He ...
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1answer
3k views

How do I prevent window drafts?

I live in Florida. I have noticed that in the Winter it seems that the cold air leaks through the windows and into the rooms. This, of course, raises my energy bill for heating (yes we have to turn on ...
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1answer
52 views

How can I increase the effectiveness of the A/C in a hot 2nd floor converted attic master suite?

Just bought a 1940's masonry construction house. House has a finished basement (cold as a meat locker), first floor (comfortable) and 2nd floor (too hot). The 2nd floor is an attic that has been ...
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2answers
137 views

cold damp corner with a dry sump

The corner of my living room (on split level) has drafts coming in via the bottom of the wall and a sump pump well (specifically, a plastic pipe that drains into it). The carpet is damp to the touch, ...
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1answer
67 views

How do you insulate exposed crawl space?

How do you insulate floor of cabin built on piers that has exposed crawl space and also keep the mice out? I want to insulate floor from underneath cabin. Cabin is in northeast U.S. and subjected to ...
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1answer
137 views

Options for insulating a ceiling that is already finished (former 3 season room)

Is there a way to insulate a ceiling that is already finished and has no access point? More details below: Recently purchased a home in Eastern Massachusetts; one of the features was a room off the ...
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1answer
262 views

sliding door leaking air, is it installed correctly?

I have 2 very newly installed ( < 1yr) jeldwen sliding patio doors (aluminum clad) , and I found that they are leaking air on inside around the bottom and side edges of trim. I am wondering ...
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1answer
186 views

Can I use 1“ XPS and fiberglass batts instead of 2” XPS insulation in my basement?

I have read multiple sources on the internet suggesting use of 2" XPS foam boards to insulate basement foundation and then building a 2x4 wall in front of it. 2" foam board is very expensive when ...
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2answers
289 views

How can I insulate behind pipes that are close to a foundation wall?

Reading around, it seems like most people suggest to put up XPS insulation when finishing a basement. That's great and all, but how do you put 2" of rigid foam behind pipes that already exist in the ...
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1answer
402 views

Can I properly install Roxul mineral wool batts in a mostly-drywalled stud bay by pushing them up from below?

Using my nifty thermal camera, I discovered that my furnace closet's combustion air duct (visible in this question) is getting really hot when the attic heats up, and then (being sheet metal) it ...
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2answers
105 views

How to check the type of installed insulated glazing

In the Netherlands, insulated glass is rated by a standardized rating system, classifying it into 3 categories by the u-value: HR : U value between 2.0 and 1.7 HR+ : U value between 1.6 and 1.3 ...
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1answer
229 views

What type of insulation can I use to insulate around my furnace exhaust?

I've got a cold breeze blowing through my basement, originating from where the furnace exhaust turns vertical. What type of insulation can I stuff in around the exhaust, to stop the cold air? This ...
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2answers
96 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
226 views

How can I insulate my attic conversion, without pulling down the plasterboard?

I recently purchased a house, and it has an attic conversion. Once winter came along we found out that there is no insulation between the roof and the plasterboard. Does anyone know of a way I can ...
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2answers
6k views

Should I add batt insulation to concrete basement walls?

We're planning how to finish our basement, and haven't been able to figure out something related to insulation. The home's in Minnesota, and was built in 2008. XPS insulation (installed by the ...
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2answers
5k views

How do I properly insulate an attic ceiling?

I'm considering insulating my attic ceiling using a foam kit. Doing a bit of research tells me that air sealing and proper ventilation are key I live in Long Island NY and currently have about R-19. ...
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5answers
4k views

What to do with a cold corner?

I live in an apartment on the 4th floor. My bedroom has the misfortune of being in the very corner of the building - it has two outer walls. On top of that, the corner between these two walls is ...
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3answers
1k views

Vented vs unvented crawl space

I've asked this question before: Vented vs unvented crawl space However, now that I'm going to get air conditioning the question comes back again and again people seem to have different opinions. ...
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4answers
931 views

What is the best way to seal this old fireplace vent?

I am doing some minor renovations to my basement with the drop ceiling and found that one of the geniuses that owned the house before me, used fibreglass ceiling tiles to seal off an old vent for a ...
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2answers
3k views

How do I determine what supplies to buy to insulate an attic?

I would like to add more insulation to an attic. What measurements and points do I need to look at to decide what materials to buy? How do I determine if I need airflow baffles? How do I determine ...
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1answer
28 views

Should I insulate my attic with a hot or cold roof?

I'm turning my 3rd floor attic into a usable space. It's a hip roof, 25' x 23', with one dormer. We just had new asphalt singles put on it and it was about 12 foot of ridge vent on the dormer / ...
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1answer
39 views

Attic ventilation, do I have enough?

I currently have blown-in insulation, that reaches the top of the attic floor. I was told by several insulation companies that I need a R value of at least 49, meaning, I need to add a good 12-18" ...