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 type of insulation can be used near knob and tube wiring?

I have a house build in the 1920's. I recently had a HVAC system installed, and i have to insulate my actic (Unfinished). The three bedrooms and one bath on the floor below have a center ceiling ...
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128 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 ...
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362 views

Can an IR thermometer be used to check wall insulation?

IR point thermometers have come down a lot in price. IR imaging cameras haven't. Is there a reasonable approach to using the point thermometer to determine how well or poorly insulated my walls ...
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1k 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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229 views

Quick and cheap insulation for skylight

I just moved into a condo and on the top floor there is a skylight window. The room gets pretty hot during the day, I have friends coming in town this weekend and I would like a cheap and quick fix to ...
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140 views

How to keep an attic over the garage cool?

The space over my garage is dominated by a large dormer, which I use as my office. On either side of this dormer, the remainder of the over-garage area is attic space. We have access panels into ...
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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 ...
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280 views

Stop heat loss through unused chimney duct

We had a 10 inch diameter metal chimney duct running from the basement to the roof. After replacing the furnace with a direct vent one it was no longer used. Cue more renovations and the section on ...
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552 views

What type of insulation has the highest R value per inch?

I am trying to find the best insulation for my apartment. The limitation is that space between the drywall and the ceiling is 1/2". I live on the top floor of my building.
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10k views

What can I do to reduce cold infiltration by a direct-vent gas fire place?

My home has a direct-vent gas fire place on the ground floor, and each winter the area around the fire place inside the house becomes very cold (granite finish). On colder days, the carpeted floor ...
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543 views

Is a PTHP an HVAC option for a super or well insulated structure?

Is a Packaged Terminal Heat Pump a good HVAC system for a structure that is super insulated or passively insulated assuming the unit is sized and fitted to meet the needs of the structure. There is ...
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3k views

What options are available for insulating interior walls myself with minimal damage to the wall?

United State | California I'd like to insulate the interior walls in my house using a minimally invasive method. My understanding that is that "blown-in insulation" requires specialized equipment ...
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927 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 ...
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1k views

How do I insulate around conduits and into difficult edges in my attic?

I am thinking about adding a little over a foot of insulation to my attics. I understand that there shouldn't be gaps between fiberglass batts (I read that this can reduce efficiency by 25%, whatever ...
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310 views

What height of insulation should I use between joists in an MDF floor?

Background I am starting my first serious DIY project - converting our garage into a playroom for the kids. The garage floor is concrete. My plan is to run timber (Sawn Kiln Dried Timber (L)3000 x ...
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3k views

How can I seal around a light fixture/light switch outlet?

I Have a house built in 1972. I'm currently 80% finished in installing a ceiling fan into my master bedroom. I had an energy audit about a month ago, which revealed that I had "pretty good sealing" ...
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24 views

Replace batt insulation or leave it?

Currently, the exterior walls have batt insulation. It has the paper face on one side. A few months ago, I removed a window due to watered down drywall caused by the window. At the time, I didn't ...
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3answers
64 views

How do I protect and insulate a ceiling built against the roof?

My upper floor used to be a large attic. Sometime in the past the entire space was converted to living space: 2 bedrooms, 2 finished closets, and two unfinished storage "closets". Much of the ...
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61 views

Do basement walls with metal framing and foam insulation require fireblocking and draftstopping?

Question: Do non-load bearing basement walls with metals framing and foam insulation (such as extruded polystyrene) in a single-family home require fireblocking and draftstopping? If so, what is the ...
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83 views

Bathroom above the Garage

Is it advisable to build a bathroom above the garage? What kind of obstacles might we face if there is a bathroom above the garage in terms of piping, insulation, etc.?
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68 views

after sealing the chimney, fireplace still not insulated

I found a way to use a large chimney balloon and pretty much block all downdraft. Sadly, the fireplace and hearth are still very cold, and it sucks heat out of the surrounding floor too. Perhaps the ...
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226 views

Water heater on concrete--should I build a platform? how much heat loss in winter?

I don't know if that title the best way to phrase the question. It's winter(ish) now, and I swear the hot water just doesn't last as long as it does in, say, September. The water heater tank is ...
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443 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. ...
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1k views

How do I insulate my garage ceiling?

My garage gets really cold in the winter and I'd like to insulate my ceiling and/or roof. Here is my ceiling I store quite a bit of things in the ceiling, so the idea is to insulate the inside of ...
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439 views

Do I have to worry about condensation on plywood over rigid foam insulation in the attic?

I have a vented attic space with poor insulation in the attic floor and rafters, so I'm going to button it up. My energy auditor suggested I insulate the floor as follows: cut blocks of rigid foam ...
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377 views

How can I insulate a room without tearing down walls?

The kitchen in my Philadelphia rowhome seems to have been....a last minute idea. From last winter, I'm almost certain there is no insulation involved in the room. Is there a way for me to do something ...
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80 views

Where to attach a storm window?

We have two very leaky, single pane windows that we need to insulate. Because interior shrinkwrap storms are impractical for several reasons, we're looking at exterior storms instead. Home Depot has ...
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90 views

Bunch of insulation questions

I have the following situation. I have a raised ranch and we're having drain tiles installed. I wanted to use this time to install some additional insulation while we've got wood paneling down. The ...
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263 views

How do I stop the second floor of my house from being so hot in the summer and so cold in the winter

I have a window AC upstairs in the summer but it is not enough I can fell the heat coming off of the ceiling in the summer and in the winter it is way to cold that my kids have to sleep downstairs ...
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112 views

Type of insulation between exhaust flue and chimney flue?

We converted a wood stove to a propane fireplace. It's a direct vent but we're only using the exhaust insert. The intake air will come from the interior. Anyways, as such, we have a gap around the ...
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229 views

How does water supply enter into a pedestal house in cold climates?

I do a fair amount of traveling through West Virginia and other Appalachian destinations and I have noticed a number of pedestal houses (that stand on concrete piers, wooden posts or a combination of ...
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8k views

How should I use fiberglass batts to insulate between floor joists over a stone basement?

I have an old home built on a stone foundation. The stone foundation is solid, as well as the floor joists. I run a dehumidifier in the basement full time, to keep the air moisture low. There is ...
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288 views

How should I insulate behind the last floor joist that runs parallel to the foundation wall?

As an aside, I can't for the life of me figure out what to call the last floor joist that runs parallel to the basement foundation. Does it have a name? In my house, there is a little cramped gap an ...
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696 views

What are some cheap (and landlord friendly) ways to fix a drafty flat?

The worst affected seems to be my room. It is the end of the turret with a massive vent (now gaffa-tape sealed) I will be sitting by the wall and actually feel the freezing cold air against my neck ...
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206 views

How can I insulate a window against the sound caused by high winds?

I'm on the top floor of an exposed block of flats which is currently being battered by high winds on a nightly basis. I have draught excluders fitted but there's still a lot of noise that comes in ...
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483 views

When should I open a skylight vent?

I have a one-floor (plus basement) house with a large skylight in the living room. It has an openable vent. When is it proper to open the vent? Should I open it in midsummer with the AC on, on ...
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50 views

Would enveloping an attic in insulation cause any problems?

My attic currently has batt insulation between the joists, and a second layer of batt insulation on top of that. In the summer, the second floor is quite a bit warmer than the first floor. I'm ...
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18 views

Concerned about the outcome of insulation fibers

I was working in an attic ,an exhaust fan was turned on I immiedetly breathed and was choked with the insulation to the point I couldn't breath ,I now feel it in my lungs as uncomfortable ,any idea if ...
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27 views

Can you paint Dow THERMAX WHITE FINISH INSULATION?

Can you paint the insulation boards after installing them? This would be for an attic interior installation. Then could I skip the dry wall? How good would it look compared to drywall?
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28 views

Replace portion of slab for radiant heat

Our 1600 SF basement has a slab floor with no insulation underneath. I'm redoing the bathroom (roughly 100 SF, with 7' along the foundation wall) and would love to put in radiant floor heating, but I ...
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36 views

Insulation type to use on a hinged metal attic door

In this question, I asked about the best type of insulation to use on a hinged metal attic door, when one is also concerned about heat entering around the edges of the door when closed. The answer I ...
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86 views

Cell Foam vs. Traditional Fiberglass Insulation for Party Wall

In an end-unit townhouse, cell foam is being used to insulate the three exterior walls. Would the gains from also using cell foam on the party wall be noticeable? Or would the cheaper alternative of ...
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66 views

How should I insulate an interior wall between a warm humid bathroom and a cold bedroom?

We're redoing the master bath. I'm wondering if and how I should insulate the interior wall. Bedroom is kept at 50F. Bathroom will be warm (radiant floor) and humid even if we have and run vent fan. ...
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80 views

Can I insulate flat roof using this method?

I just wonder if I can insulate my flat roof in northern India by following steps as under: Apply a cover of Bitumen Cover it with polythene (for water proofing) Lay used cement bags on polythene ...
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62 views

Looking for Second Opinion on New Insulation in Attic

I had someone come take a look at the attic yesterday to do an assessment. He uses the sprayable foam insulation and said that he would spray the ceiling of the attic rather than the floor (and remove ...
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88 views

Can I insulate PEX pipe in a crawlspace with fiberglass insulation?

I have PEX pipe hung under the floor joists in my crawl space. I am inclined to cut fiberglass wall insulation R-14 into strips and run it under the pipe.That will encase it as the floors are well ...
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53 views

How to fill an old window alcove?

In one of the bedrooms in my house (1930s), there is a sunken alcove where an old window used to be, the internal sill is still there. Whoever bricked up the window used bricks much thinner than the ...
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156 views

How do I apply foam board insulation behind a new recessed shelf in an exterior wall?

I want to make a recessed shelving in a exterior wall. When i took out the drywall, I found no insulation between the studs. Before I place the shelving parts, I want to put some insulation first ( I ...
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45 views

how to insulate very wide fireplace?

I want to air-seal my fireplace. The damper is 44" wide, and it's about 4 feet off the floor, not easy to reach. The chimney tapers gradually for several feet after that, a couple inches narrower per ...
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53 views

Foam Insulation

I recently had to partially rip out the dry wall and insulation from an inside wall that joins to the garage. The outside wall had a styrofoam layer to it. My tape measure says it's 1 inch thick. ...