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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Can I setup insulation without tearing down walls?

My situation is this: I moved into a new apartment last year and my office is the only room that isn't insulated, which is annoying. My daughter's room and her playroom are both insulated as expected. ...
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4answers
180 views

How to cover exposed attic wall insulation

I have a small walk (crouch)-in attic from the closet of one of my upstairs bedrooms. It has insulation on the walls that form the bedroom closet/wall. Given how small the attic is, whenever I go in ...
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1answer
268 views

knee wall no venting possible

My master bedroom is above my garage. There is one part of the bedroom that has a cathedral ceiling with knee walls on both sides. There is no attic above this area because the drywall goes up along ...
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1answer
42 views

Improving insulation on windows and preventing heat loss

Here are the images of my window (currently it's 18F/-8C outside, 74F/23C inside): Now, this condensation / ice forming gets even worse - on some days whole bottom of the window from the first ...
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1answer
293 views

Adding ventilation and insulation with limited soffits

I’m hoping to add some insulation and ventilation to our attic. It’s a 1954 with a 1991 addition. The second floor is warmer in the summer, the original part much warmer than the addition. Current ...
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1answer
291 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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1answer
42 views

What type of garage door seal is this?

Is this a type I cannot find, or is this just a normal flat rubber type that has been shoved into the kerf cut, folded over, and stapled? If the latter is the case, any idea why someone would do it ...
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2answers
81 views

Aerogel insulation viable?

I have read that new aerogel-type insulation offers potentially better efficiency than ordinary fiberglass, albeit with greater cost. Is this true at a practical level? Should I look at replacing some ...
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1answer
83 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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0answers
34 views

Jenn Air SVE47600 electric slide in range hole in oven--fire hazard?

My Jenn Air SVE47600 16 year old electric slide-in downdraft range has a hole (approx. 1.5" to 2" x 1") in the oven liner (underneath the broiler element) near a steam vent! Seems like it rusted. ...
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1answer
56 views

Attic insulation: Giving unfaced insulation a face

I just moved into a small 1950s home. The previous owner had purchased tons of unfaced fiberglass batts and they are still in their bags, piled up in the attic. So I'm going to clean up the little bit ...
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4answers
120 views

Should I use spray foam to insulate a basement?

Home in CT cape w/ uninsulated basement. Its a cold, not drafty house, with new Marvin integrity windows. The basement is very cold, and it seems like the cold basement is making the rest of the house ...
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3answers
328 views

Insulating/preventing heat transfer on non-IC rated recessed lights

I recently bought a thermal leak detector and discovered that my recessed lights upstairs are leaking a lot of heat and causing the upstairs to be uncomfortable and hard to cool. This is the brand ...
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1answer
207 views

How to build a wall under duct work

So I'm trying to finish my basement. I have a conundrum as to how to build a wall under a soffit. Here's my situation - I have an HVAC duct that is running really close to the wall - like maybe 1.5" ...
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1answer
36 views

What is the best skim coating for polystyrene sheets?

My log hut is extremely hot, I have glued polystyrene sheets to the ceiling and would like to skim to create a clean finished off appearance. The sheets are the pressed pellets type (not isoboard) ...
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3answers
38 views

Should I add another gable vent to my attic?

I have a long house with a 3 sq foot gable vent on the east end. I have two 6 ft long roof vents in the middle and I want to know if I should install another gable vent at the west end to increase ...
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2answers
124 views

Do I need to insulate the entire basement or just a few walls?

I have a 1920s house with concrete foundation that had a semi-finished basement. After a recent 3-day rain storm, my basement flooded (about 1") due to hydrostatic pressure. It wasn't just my house -- ...
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2answers
80 views

Where can I buy home improvement materials and supplies in my community?

I'm new to Home Improvement. I've been planning to start (slowly) finishing my basement myself. The first thing I need to do is tear down the existing ruined insulation and replace it. I'm trying to ...
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1answer
55 views

How to build attic space in garage

I have a garage with a peaked roof supported by 2x6 trusses spaced at 48". I want to insulate the attic space. How should I proceed? I'm planning to toenail 2x4s perpendicular to the trusses (spaced ...
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2answers
52 views

Should I insulate a garage when converting it to a workshop?

I am wanting to convert my garage in to a workshop and i wanted to know how important it is to insulate the walls so i am never working in freezing or roasting conditions. I am in the UK so our ...
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0answers
34 views

How do you insulate with XPS around interior basement windows?

I'm using 2" XPS to insulate my interior basement walls. How do I work around windows? Do I cut it flush with the concrete opening? Do I spray expanding foam to seal the XPS against the concrete ...
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1answer
62 views

How to lay heat cable (de-icing cable)?

The issue I'm having is that ice builds up on the lower roof, creating a dam. The upper attic is double insulated, but is exposed to sun throughout the day. The lower roof (next to the sidewall) ...
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3answers
87 views

Adding insulation to attached garage

I have an attached garage I use as a workshop, and I'd like to insulate it since I plan on running water and sewer lines into the garage for a utility sink*. Right now, the garage is just studs and ...
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1answer
76 views

Interior cement walls

I want my interior walls to be cement. Can insulation Foamular 150 rigid foam be added to the cement wall on the exterior side with siding on top of it.
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3answers
138 views

Semi-finished basement, water-resistant “baseboards”?

I'm planning on applying foam-panel insulation over my basement's concrete wall. I'm told a fire barrier is required over that, either plasterboard or decently-thick plywood. I've been considering ...
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1answer
76 views

Insulating ducts in unfinished basement?

Hi I am looking to insulate circular metal air ducts in my basement because the air reaching some of the farther rooms (from furnace) on the second floor of my home is comparatively much cooler. I ...
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1answer
25 views

EPS insulation inside exterior walls

I have access to a large amount of EPS in the form of used multi-cubic-foot blocks (I believe they used to be boat dock floats). Because of the high R value of EPS, I am thinking about slicing them ...
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1answer
136 views

What to insulate first? Attic, walls, kneewalls?

I know a number of people in a similar situation that want to add insulation to older, poorly insulated homes. Homes are similar. Poorly insulated attics (6" of fiberglass batts), no insulation in ...
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4answers
180 views

How to prevent heat loss over a recessed light?

I have a recessed light installed in a sloped ceiling - no attic space over it. On a cold morning when there is frost or snow on the roof and I stand outside the house, I can see a warm spot directly ...
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2answers
372 views

What is the downside to installing faced fiberglass insulation in a dirt floor crawlspace vs non-faced?

I have a vapor barrier on the dirt floor already. The insulation will go in the floor joists above, paper side down.
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1answer
78 views

Foam insulation in interior walls

If I use foam insulation on the outside (2") and in the 2 x 6 walls (from 4 - 5"), do I need to fill in the leftover space on the inside with fiberglass or Roxul, or just put the vapor barrier over it ...
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1answer
201 views

How to stop cold air entering through the breaker box

The breaker box is located in the laundry room of the house, which itself is an air conditioned space. I bought the house in the summer and this winter the room has been extremely cold even when the ...
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1answer
3k views

Can I install insulation over the HVAC duct work and plywood?

Currently there is R19 faced insulation installed between the floor joists. I am adding R30 unfaced perpendicular to the currently installed R19. I have two questions: 1) There is an HVAC unit in ...
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2answers
161 views

Insulation foam in hollow bricks and blocks

This is a wall in the extension to my house, which I estimate to have been added around the 1930s (house is 1909) using mostly large hollow bricks that look more like cinder blocks but are not of ...
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0answers
41 views

How should I go about insulating a 1920's stucco house in LA?

I own a two story, 3200 Sq ft house in Los Angeles. The exterior is stucco and the walls are lathe and plaster. A year ago we had some water damage after a rain storm. When the contractor demo'd ...
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1answer
48 views

Should there be a gap when adding insulation in a wooden outbuilding?

I'm currently in the middle of a home office project. It's a simple wooden outbuilding and I'm insulating it with polystyrene sheets. Once they are in, I'll go over them with with some tongue and ...
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2answers
11k views

How to insulate a concrete slab foundation in an older house?

What are some ways to insulate a concrete slab type foundation in an older home built in the 1950's? As far as I can tell, the slab is not insulated at all and results in a very cold floor and living ...
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4answers
2k views

What is the best way to patch 3" holes in plaster

I have a number of ~3" holes in my plaster from where my walls were filled with insulation. (Why did they drill a 3" hole? I have no idea). Obviously I would like to fill these holes in, but they ...
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1answer
67 views

Leftover mineral wool insulation

I am insulating my house, going with R38 Fiberglass batts (single faced) in the attic. I will have a decent amount of Mineral wool 1.5" thick and 7" thick that ranges from R5 to R30 respectively. I ...
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1answer
129 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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3answers
210 views

Spray foam insulation around wood stove pipe

I recently had some spray foam installed in the attic and the crew put it right up against the chimney pipe. Is this a concern? Should I carve out 2" and replace with something? ...
3
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1answer
87 views

How can I repair a bathroom fan under garage that is leaking in the winter?

I have a rigid metal exhaust pipe coming out of the bathroom fan over my downstairs bathroom. It goes up at approximately a 30 degree angle for about twenty feet and stops just before it gets to the ...
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3answers
67 views

How do I check my upstairs bedroom for insulation in the ceiling?

I have a bungalow home in Michigan that has plaster ceiling. How do I check if the ceiling is insulated between ceiling and roof with no access point? The upstairs room was meant to be an attic but ...
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2answers
930 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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2answers
124 views

How can I seal an interior door

One of my bedroom doors has gaps at the bottom and side. How can I close or seal these gaps. I would like to heat only this room and prevent loss of heat to other rooms. The gap at the bottom is from ...
2
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1answer
65 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 ...
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2answers
57 views

Add fiberglass rolls across joists in attic if joist cavities not completely filled?

We purchased a house with an insufficiently insulated attic. There's currently about 2-3 inches of loose-fill fiberglass insulation in between the 2x6 joists. I'd love to just roll unfaced R-30 ...
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2answers
49 views

Choosing a soundproof apartment - how wall and ceiling material predicts sound levels

Looking at different flats for a new home I would like to determine how much noise I would get from neighbours based on the brief visits to see the candidates. How could I measure that practically? ...
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3answers
84 views

Mineral wool on top of fiberglass. Density and compression

A while back I asked about adding my 1.5" thick pieces of mineral wool insulation batts ontop of my 12" thick fiberglass I am installing in my attic. As I have began doing this, I am seeing that the ...
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4answers
28k views

Is super insulating exterior walls with rigid foam board insulation possible?

2" rigid foam-board insulation can have an R-value of up to R-10, layering 4 boards would create a R-40 value, right? However that creates an 8" foam wall above the actual wall. What would be a ...