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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114 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
53 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
50 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
33 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
61 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
86 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
137 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
75 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
24 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
132 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
170 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
332 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
184 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
146 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
40 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
44 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
64 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
111 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
178 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? ...
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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
61 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
924 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
89 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
63 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
51 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
47 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
80 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 ...
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2answers
104 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 ...
2
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1answer
41 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
101 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
299 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
2k 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
116 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
681 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
59 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
64 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
67 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
20 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
51 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
20 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 ...