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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140 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
80 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
28 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
164 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
208 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
501 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
79 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
242 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
195 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
43 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
53 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
74 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
165 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
285 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? Pictures:http://m....
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1answer
90 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
84 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
960 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
224 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 ...
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1answer
74 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
70 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
58 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
100 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
30k 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 ...
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2answers
173 views

Is having cloth touching a grounding wire ok?

In my basement, the ceiling of one of the closets is the copper grounding wire that runs from the breaker box to my water main. This wraps around the perimeter of the basement on the top of the rooms ...
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1answer
49 views

Using 10 1/4 inch fiberglass insulation in a 6 inch space?

I need to insulate under a floor that has hydronic radiant heat. I am going to use fiberglass batts between the joists of the floor, with the kraft vapor barrier upward (toward the warmer area). The ...
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1answer
128 views

Vapor barrier problems

Update: added some additional details below based on comments. I have a basement bathroom that I am currently working on. I've framed and installed rough plumbing. I have some vapor barrier problems ...
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1answer
314 views

Can rigid foam board have an air space between it and rim joist?

I am insulating my rim joists with 2" rigid foam board. Most of the rim joist is bare, and the foam fits along it nicely. Some sill boxes have some small irregularities (vent pipes, plumbing, etc) ...
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2answers
3k 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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2answers
210 views

Sheathing with Foam Board and OSB

I have read a number of other articles related to sheathing and the use of rigid foam panels for insulation and was wondering; is it possible to place a 1" to 2" rigid foam panel against the wall ...
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5answers
747 views

Can insulation foam expand around window framing and cause warping?

I was just wondering if insulation foam (I used regular Great Stuff from HD) can expand in dry conditions around a window (frame) and cause warping and damage to the window up to and including ...
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1answer
61 views

Method to fasten pink board to interior foundation wall

So I'll be finishing my basement soon and will be using 1.5" pinkboard attached to my interior foundation walls. What is the best method to fasten this to the wall (construction adhesive, caulk)? ...
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1answer
94 views

Concerns about cutting into roof for attic access?

I've spoken with a contractor who proposes cutting a hole in the roof of our circa 1900 house to access the attic for installing insulation. This intuitively seems like a bad idea--that it could ...
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1answer
85 views

Insulating the concrete attic with rockwool slabs

I want to insulate the attic with rockwool slabs in an unusual way. My house is old and we may have to rebuilt a new house in next 5 years, so I do not want to spend a lot of money on this. Attic / ...
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4answers
3k views

How to apply wallpaper over styrofoam?

I live in an attic, and the head part of my bed is in a corner where the roof slope, an outer wall and the wall to the neighbour's unheated attic meet. After a few winters of waking up to the feeling ...
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0answers
22 views

Slab on grade room construction

Older home built in 1968, southern Ontario, 4-level split, built in single car garage. Behind the garage is a bathroom that I had to gut because of a pipe burst. This room is slab on grade. The two ...
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3answers
6k views

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
52 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
174 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
21 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
78 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
65 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
67 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
165 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
117 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
54k 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
104 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?