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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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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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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85 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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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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129 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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2answers
105 views

How Do I Insulate My Bathroom Floor?

I'm renovating my bathroom and I need to insulate the floor. It's a concrete slab with 2x4 joists set on one brick piers. The home was built 50 yrs ago. There was no insulation at all in the floor. ...
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183 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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145 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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4answers
166 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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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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43 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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63 views

Attic Insulation

I have Insulated AC flex duct work in my attic. Am I correct in that since its insulated already if I lay insulation over the duct work it is fine as long as the duct work is sealed properly? I have ...
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105 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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174 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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93 views

Insulation and vapor barriers behind Corian/Greenboard shower walls

I've got a small bathroom that I am working on repairing/refinishing. I've removed the existing (leaky) shower and base and am replacing them with Corian-like materials (Kohler's Choreograph for the ...
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2answers
86 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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79 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
29 views

Replace insulation in a Trane HVAC? (TWE030C140B0)

I found a little mold on the foil covering the insulation in my TWE030C140B0 air handler/ AC/Heater. I am 95% sure I have the moisture problem resolved and now I need to replace the insulation. Does ...
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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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50 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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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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52 views

Insulation over ceiling drywall nailers or scabs

So fiberglass batts 12" thickness. The goal is to not let the insulation become compacted or have gaps between unconditioned and the conditioned space. When a drywall nailer is fastened to the top ...
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79 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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78 views

Will foam tape stop condensation on metal windows?

I am having an issue that water is building up on the inside of my metal window. has anyone tried putting foam tape on inside or outside to stop condensation?
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102 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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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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228 views

Do you tape kraft faced insulation?

So I am going to use 12" R-38 kraft faced insulation in my attic. I plan on face stapling the paper to the bottom chord of each truss. I imagine most of the seams sideways where stapled will ...
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100 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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113 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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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
63 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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680 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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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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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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54 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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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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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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50 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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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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69 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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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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269 views

What's the right way to insulate and frame around this pipe?

I have been studying the latest engineering on how to insulate and frame basements after tearing out a partially finished basement that had wood and insulation in direct contact with the concrete. ...
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51 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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151 views

How do I handle baffles at the corners on a hip roof?

What do the energy pros do here in the corner of a hip roof? I don't have enough room to install a baffle. I want to install insulation here, so I'm not sure if I would run into problems with moisture ...
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142 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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83 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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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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93 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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119 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
415 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 ...