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 material should I use to insulate floor over a bumpout?

My dining room has part of it bumped out about 2 feet overhanging from the foundation. The floor over this overhanging part gets cold in winter and I'm thinking about insulating below it. I've done ...
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1answer
49 views

Should my roofer have vented my insulated roof?

Shortly after buying a mid-century split-level in the Pacific Northwest I had the old torch-down flat roof replaced with a PVC membrane. As half of the top level has a vaulted ceiling without much ...
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3answers
172 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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0answers
19 views

How to insulate under hot water radiant flooring over a crawlspace?

I just built a small extension on my wood frame house. We are in the northeast (winters down to the low teens). We added three small rooms (mudroom, laundry, bath). They all now have hot water ...
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2answers
60 views

My house has Exterior & Interior insulation. Would it be advisable to remove the internal?

A bit of background: I've bought a house built in the 1960s which has been retrofitted with "bolt-on" insulation. On the inside, which was done first, there is a layer of plasterboard with insulation ...
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1answer
500 views

Insulating a post and beam construction roof/cathedral ceiling

My house (built 1972) has a cathedral ceiling with post-and-beam construction in the main room. The ceiling temperature can get as high as 90F, or even greater on a very hot sunny summer day, as ...
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1answer
64 views

Why do blinds have two different close options?

This hopefully works on this site. It certainly should be DIY, though a rather paltry task. Why do blinds have two close options? There are two different angles that they can be closed and this seems ...
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2answers
42 views

How to heat proof aluminium windows, prevent heat from entering?

Aluminium windows made about 15 years ago. In hot climate, all day sun the frame becomes hot to touch when touched from inside. What can I do to insulate heat form entering? I know about accordion ...
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0answers
103 views

Insulating already finished basement

During a repipe, I recently discovered that my finished basement was never insulated. I live in the PNW (marine climate- zone 4), and the basement is always pretty comfortable- cool in the summer and ...
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0answers
59 views

Wanting to insulate attic in 1930s home, have some questions (baffle install, soffit venting, mixing cellulose/fiberglass, etc)

Have a 1930's 2-story house. I recently upgraded the wiring in the 2nd story to get rid of all the knob/tube left in the house, and I figured while I'm up there I should add some attic insulation ...
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1answer
38 views

Remodeling an old mechanic's garage into a conference space

I am currently remodeling an old garage (Lube Center) into a conference space. Right or wrong, this is what I'm doing. I have already installed insulation with paper backing on the ceiling (Open ...
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5answers
48k views

What can I do about a room over the garage with temperature problems?

I'm learning many things about our new home. This winter I learned that a room directly above a garage stays much colder than the rest of the house (up to 10+ degrees colder in our case). What options ...
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2answers
76 views

Will batt insulation ignite if it is laying against my steam pipes?

I have steam pipes behind a wall that I loosely packed R30 batt insulation against. Is there a possibility that the insulation will ignite?
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3answers
5k views

What type of insulation is needed for exterior walls on a brick house?

I have a government grant (2,440$) to insulate all of my exterior walls. The issue is, I cannot access them from the outside because I have a brick house. My first guess was that I will need to take ...
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1answer
761 views

How can I insulate a room without tearing down walls?

The kitchen in my Philadelphia row home seems to have been a last minute idea. After last winter, I'm almost certain there is no insulation installed in the room. Is there a way for me to do something ...
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1answer
81 views

How can I add insulation to my attic cheaply and safely?

I currently have 6 - 8 inches of cellulose blown in insulation in my attic. I live in Michigan and energystar.gov is recommending a total of R49 - 60. From what I can tell only have about R19-25 ...
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3answers
466 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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1answer
111 views

Putting plywood between layers of attic insulation

Sorry if this is a silly question, but I've searched an haven't been able to come up with anything helpful. I'm planning on wiring my house for Ethernet, and I'm going up to the attic to do some ...
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3answers
358 views

Install plastic between drywall ceilings and rafters?

We are building a new house and are getting ready to install the drywall on the ceilings. We have installed a 6 mil plastic barrier on the underside of the rafters to act as an air & moisture ...
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2answers
44 views

Insulating the roof rafters

I have a heater/AC UNIT installed in my attic and in winter the heat from the unit melts the snow turning into ice and creates a nitemareso I want to put insulation in the rafter to insulate the roof ...
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3answers
40k views

What's the best way to keep my garage from freezing?

I live in Colorado. My 1950s house has a one-car attached garage that was built in the 2000s. The walls that are not shared with the house are not insulated: the studs and sheathing are visible from ...
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7answers
24k views

Is there an NEC-compliant method of repairing minor damage to electrical wire insulation without a junction box?

While trying to pry loose a stubborn cable staple that fastens a 14-gauge electrical cable to a stud, I accidentally tore a very small hole through both the outer jacket and the insulation around the ...
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0answers
54 views

Insulation and Vapor/Moisture concerns with a wood ceiling.

I have already removed the drywall in the ceiling so the rafters and bat insulation is currently visible. I plan to be adding plywood to the ceiling and then installing 1x6 boards on top of the ...
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0answers
26 views

Proper method to seal a heated crawl space

I have a heated crawlspace with a dirt floor. There are no vents, it is fully connected to the house, and currently has a pool liner and vapour barrier stretched over it, but it is not sealed. There ...
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6answers
23k views

Why don't people use rigid or spray foam insulation in attics?

I'm looking to upgrade the insulation in my attic bumping it from an R-6 to R-30 or better, and while looking into things I realized I've never seen anyone use rigid or spray foam insulation in an ...
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0answers
23 views

Insulating attic - vapour barrier question

My girlfriend has her parents 61-year-old home in St. John's NL and it has an attic with poor ventilation and unfastened R-12 kraft-faced (and facing up) fibreglass laying on the original drywall. I ...
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3answers
6k views

Installing bathroom exhaust fan: what to do with vapour barrier and insulation?

I'm adding a bathroom exhaust fan, which is being mounted in the ceiling of the bathroom (in the attic) and venting out through a vent in the wall. right now, there is a vapour barrier (paper) ...
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1answer
49 views

How should I insulate a wall I opened up?

I am remodeling a bathroom and adjacent room and walls that are on the exterior side of the house are now open. I am trying to figure out what I should do to help insulate the walls better. The house ...
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2answers
6k views

How can I insulate a sash window?

I just moved into an old flat which has old and weathered down sash windows which let a lot of cold air in. As Scotland does get very cold at times I would like to insulate them in a cheap and ...
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2answers
273 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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2answers
119 views

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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1answer
96 views

Kitchen remodel to studs, infilling a window, no insulation, no building wrap!

looking for some urgent feedback. My Husband and I are remodeling our kitchen. We're down to the studs, and two of the walls are exterior. The house is a 1920's bungalow. We're actually making our ...
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7answers
49k views

Should I insulate air conditioner coolant pipes?

I recently replaced some rotted insulation on the coolant pipe that runs out of my AC unit and into the evaporator in my house. When cleaning inside the actual AC unit itself I noticed that the ...
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7answers
12k views

Is insulating an unfinished basement worth it? If so, how should I go about it?

I have an unfinished, well waterproofed basement with cinderblock walls and a concrete floor. All but the top 6 inches / 15 cm or so is underground. Would it be worth insulating the walls down there? ...
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1answer
65 views

Which is more effective in a 3.5“ stud bay--”R13“ or ”R19" batt insulation?

I have extra R19 insulation batts (designed for a 2x6 bay)--should I use them in a 3.5" stud cavity, or does compressing them that much make them less effective than R13 batts in the same space?
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2answers
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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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2answers
37 views

South Florida roof softit roof ventilation and of insulation batts

I live in south Florida and am insulating the roof by placing batts between the rafters. I'm not sure if placing the batts up against the edge where the beams and walls meet is ok or not. The rafters ...
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2answers
36 views

Correct Glue for Foam Outsulation?

My house is masonry block about halfway up and then wood siding with top. Two months ago I had outsulation installed. It’s made up of 2x4 feet foam panels that are 2 inches thick. These are covered ...
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1answer
43 views

Can fiberglass insulation cause leaks?

I've recently bought a 100 year old wood frame house from a DiY guy who took decent care of the place. He didn't put any insulation in the attic though and my home inspector said insulation is a great ...
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6answers
18k views

Can I install cellulose insulation without a blower machine?

I've purchased a few bags of loose fill cellulose insulation from the local hardware store (GreenFiber brand). How will the insulation work if I don't put it through the machine to fluff it and force ...
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0answers
42 views

Monolithic frost proof shallow foundation, advice on the smaller details?

I'm building a 16x24 shed/garage. I have done most of the site work and I have a concrete guy starting tomorrow on the forms in preparation for a pour on Friday. He's done insulated slabs, he has 30 ...
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4answers
1k 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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0answers
146 views

Is it worth spending extra on R14 or R20 fiberglass insulation

I've put in 1" Type 1 polystyrene (estimated at R3.75) around the exterior walls and I'm deciding which insulation to use in the framing. The R12 works out to $.38 p/sqft The R14 works out to $.54 ...
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1answer
131 views

What are my options to fix cold and drafty floors over a vented crawl space?

I have a 1950s bungalow that sits on a crawl space. The crawl space is vented and has moisture problems (which I should/will fix, but that's not the main point of this question). R19 insulation is ...
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1answer
76 views

Is it better to fill up the space between rafters with insulation, or put baffles on top and add soffit vents? (inland Los Angeles, cathedral ceiling)

I have 5.25" tall rafters, about 30" on center, with roof planks directly on top of them. I would like to keep the rafters visible, but add insulation between them. So I only have a few inches to work ...
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1answer
40 views

Interested in home will mold problem . Can mold be in carpeting? Howe do i remove

Interested in purchasing a home that has been empty for several years. Has a little mold on upstairs walls able to take care of that. One room has ceiling repairs with mold. Can the mold go up into ...
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2answers
62 views

How do I insulate a crawl space?

I have approx 500 sq. ft. of crawl space (under addition to original home). 15 x 35 ft. with 2 x 10 joist & concrete flooring ( no dirt ). Ventilated to outside is provided by 3 windows. The ...
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1answer
65 views

What type of insulation should I use in a knee wall?

We have an unfinished bonus room over the garage on the second floor. A normal door goes to it and same height as rest of the 2nd floors and full sized windows and the house was zoned for the ...
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2answers
203 views

What product will insulate an exterior PVC pipe coming out of the ground with a faucet on it?

We want to insulate from freezing an exterior 24" tall PVC pipe coming out of the ground that has a faucet on it ~ a heated product is not plausible in our situation. Are there other products that ...
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1answer
51 views

Is it okay to 'sandwich' rigid foam insulation between old and new sheet siding?

I am putting new LP Smart Siding (4'x 8' and 3//8" thick) onto my house, which will overlay old T1-11 siding. I would like to put R-MAX 1/2" rigid foam insulation under the new siding. Is this okay? ...