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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Why is it so cold downstairs?

My house has a concrete slab foundation and the floor in the kitchen and living room is all tile. It is always freezing downstairs in the winter and I'm wondering if this is due to the floor or maybe ...
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+50

cold damp corner with a dry sump

The corner of my living room (on split level) has drafts coming in via the bottom of the wall and a sump pump well (specifically, a plastic pipe that drains into it). The carpet is damp to the touch, ...
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1answer
29 views

How to fill an old window alcove?

In one of the bedrooms in my house (1930s), there is a sunken alcove where an old window used to be, the internal sill is still there. Whoever bricked up the window used bricks much thinner than the ...
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2answers
36 views

What to use when sealing floor-to-wall and window-to-wall?

During my infiltration (air leakage) test we found two other major places where air is leaking through into my home: the joints between the wood floors and the wall (wood) molding the joints ...
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1answer
66 views

What do I use to fill in the crack between the wall and floor of my tiled bathrooms?

Yesterday I had an energy audit performed on my home which revealed sever leakage of air from the floors in both my bathrooms. The inspector told me to fill the cracks but was vague as to what would ...
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64 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
29 views

Best way to stop boiler steam from entering attic

I have a cape cod. The boiler is in the basement and vents to the outside about a foot above ground level. I get a considerable amount of snow melt and ice buildup in the attic section directly ...
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3answers
61 views

Is it okay to not have a vapor barrier in lightweight tiny house type construction?

So, I have a bit of an odd project. It is a bit outside of the box, and I'm looking for alternative approaches that stick with the theme (if the plan outlined below doesn't work, that is). ...
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1answer
36 views

Thermal Mass Puzzle I Can't Figure Out

I live in Los Angeles and have 2 units on my property. I use the front one as my office. I had the floors done years ago and thought I would get tile and have a subfloor of cement put in so that I ...
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2answers
73 views

How can I fix a leaky door with new compression stripping?

I have two exterior doors that are leaking air, they shut fine and the weather stripping is the original installed when the house was built about 8 years ago (with the exception that I replaced ...
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1answer
39 views

How do you insulate exposed crawl space?

How do you insulate floor of cabin built on piers that has exposed crawl space and also keep the mice out? I want to insulate floor from underneath cabin. Cabin is in northeast U.S. and subjected to ...
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1answer
52 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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2answers
65 views

How should I insulate garage walls?

I am remodeling a one car garage in an old house. As part of the remodeling, I am taking all the insulation out (in the walls that have insulation). It is a combination of faced and unfaced ...
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2answers
43 views

Can I install insulation on the ceiling of an old unfinished basement?

Can I install insulation on the ceiling of an old unfinished basement? I have a bungalow home with hardwood floors.
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1answer
37 views

elegant attic hatch design for several purposes

My attic hatch measures roughly 2' square. Presently, it has insulation on top of the hatch door (in the attic). Because some of the hatch sticks up above the insulation on the floor of the attic, ...
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3answers
169 views

Easy way to temporarily insulate gap between hardwood floor and baseboard?

Odors are entering my apartment from a neighboring unit, and it appears to be getting in via a draft between the baseboard and hardwood floor in my apartment. The draft appears to be localized to a ...
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1answer
45 views

Should I install a moisture barrier before installing engineered hardwood in a partial basement?

I am thinking about using a 6 mil poly and a thicker sound/water barrier to make walking on the floors a bit softer. I plan to tape (or use silicon) as a means to seal moisture. My question is, is it ...
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1answer
53 views

Wisconsin Basement Finishing questions

Last year I decided to let my brother-in-law finish my basement. After he finished the framing he moved away. Now I have wood framing complete and nothing else. He claimed he knew what he was ...
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2answers
47 views

after sealing the chimney, fireplace still not insulated

I found a way to use a large chimney balloon and pretty much block all downdraft. Sadly, the fireplace and hearth are still very cold, and it sucks heat out of the surrounding floor too. Perhaps the ...
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0answers
27 views

Can i replace the existing screed on concrete slab with floor insulation and electric underfloor heating?

Can i replace the existing screed on concrete slab with floor insulation and electric underfloor heating ? Standard screed thichness is something like 50 mm to 80 mm or so. My idea is to replace the ...
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1answer
42 views

How do I apply foam board insulation behind a new recessed shelf in an exterior wall?

I want to make a recessed shelving in a exterior wall. When i took out the drywall, I found no insulation between the studs. Before I place the shelving parts, I want to put some insulation first ( I ...
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1answer
44 views

Insulating a stucco home

What is the best way to insulate a 1969 stucco home in the SF Bay Area? I have added a lot of insulation in the attic area but the rooms and walls are cold. Any suggestions? Steve
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0answers
22 views

Basement insulation under cantilever [duplicate]

I have a currently unfinished basement in a rather new home. There are a few places that have bay windows, or cantilevers that currently have only a bit of pink insulation thrown in fro the basement. ...
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1answer
42 views

Options for insulating a ceiling that is already finished (former 3 season room)

Is there a way to insulate a ceiling that is already finished and has no access point? More details below: Recently purchased a home in Eastern Massachusetts; one of the features was a room off the ...
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1answer
38 views

how to insulate very wide fireplace?

I want to air-seal my fireplace. The damper is 44" wide, and it's about 4 feet off the floor, not easy to reach. The chimney tapers gradually for several feet after that, a couple inches narrower per ...
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1answer
48 views

Foam Insulation

I recently had to partially rip out the dry wall and insulation from an inside wall that joins to the garage. The outside wall had a styrofoam layer to it. My tape measure says it's 1 inch thick. ...
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1answer
55 views

What is the proper way to insulate a cantilevered bay?

I have two areas of my house which are cantilevered. One is a bay area which extends about 2'. The other is the bottom of a fireplace box (gas fireplace). I have placed two layers of R-13 (I think) ...
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0answers
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How can I stop my windows from leaking when mild winter weather occurs?

We have an 11 year old bungalow and this problem only occurs on the middle section of a bay window. We think that frost happens inside the insulation somewhere and when the temperature outside is mild ...
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0answers
39 views

What could cause moisture on my bonus room floor?

Last week during a cold snap with high winds. I discovered moisture along the floor on one side of my bonus room, above the attached garage. Their was enough moisture that the baseboard molding ...
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2answers
64 views

Does anyone have experience with insulating with waste-wool from shearing?

Does anyone have experience with insulating with waste wool from sheep-shearing. I am interested in washing and deodorizing techniques and also in the packing-density requirements. Plan is to use ...
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1answer
70 views

Can I use foil bubble insulation inside the house on exterior walls?

I am retired and on a very limited income and this house needs some insulation! The walls are cold in the interior (the walls that are not interior type walls but on the other side is the outside.). ...
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2answers
67 views

How do I find the proper wires for service drop?

I have 125 amp service, and bought two #1 AWG black-colored wires for the electrician to use in his replacement. I couldn't find a white wire that size, or bare copper. Neither at Lowes nor Home ...
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1answer
58 views

How could one insulate sill plate from the outside?

My house has a gap between the Basement wall and Sill Plate (location best shown in this picture). While there are several question and answers here, I have not found any that deals with a fix from ...
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2answers
63 views

Optimize insulation cost / benefit

I have roof made by scheme from images. Both should be same, just different angle. I have 20cm of space yet to fill. How can I calculate conductivity in W/m2K if i fill missing 20cm of space with 20cm ...
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1answer
28 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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0answers
144 views

Cost of XPS panels vs. sprayed closed cell foam

I'm starting the process of finishing my nearly full height (7'2") basement and am costing out the insulation. Based on my research of what's best below grade, I'm debating between XPS foam panels ...
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2answers
55 views

Attic Moisture frost forming

WE have frost forming on the underside of the roof decking and on the nails there seems to have adequate insulation R-30 proper vents and ridge vent
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1answer
76 views

Air Seal recessed cans without attic access

I recently discovered moisture in my attic and the mold inspector recommended sealing all the canned lights in our house. We have about 30 in vaulted ceilings where there is no attic access. Any ...
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0answers
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What is the best way to subdivide and heat a large room?

I live in a large room and would like to subdivide my room, such that it can be heated with a space heater/small mobile radiator. I live at the end/corner of a large L shaped room, with concrete ...
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1answer
23 views

When insulating a new house does the poly have to be caulked and taped at the top?

How far down from the top of the wall does the poly covering the insulation have to be and does it have to be caulked at the top and bottom and taped?
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3answers
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Can I remove the framed wall on the outside of my basement?

I have a 20 year old house (which is a basic colonial box). The basement has a standard poured concrete exterior wall. Against the concrete exterior wall, they framed a standard wood 2 x 4 wall, ...
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2answers
61 views

How to strengthen cracking joint compound after application over insulating foam sealant

Long story short, the wife is pregnant and wants the cats litter box 'outside.' My solution: put a 1'x1' hole in the wall ~10" deep between our living room and patio. Place a pet door over the ...
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1answer
93 views

Help needed to calculate the R value of a brick veneer wall (house built in 1958)?

I live in a house that was built in 1958. I am looking for the R value of my brick veneer walls. For that I would need to know how the wall was built (there should be the brick, some sheating, ...
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0answers
32 views

what is air permeability of silicone caulk?

What is the air permeability rating of silicone caulk? (say, GE Silicone II). I see that at building science there is a listing of various building materials and their permeability ratings, but it ...
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1answer
479 views

How to seal between sill plate and foundation wall with wide gap?

Here is a picture of the top of my uninsulated basement wall. The foundation is poured and from early 1970s. For orientation to the photo: the white in the lower left corner is the vertical face of ...
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1answer
54 views

What can I use as a temporary noise insulation on a door that connects bedroom and bathroom?

our bathroom has 2 doors and we only use one. The other one remains shut and it connects to a bedroom. We do not intend on ever opening it (but we are renting the place so we need something that ...
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1answer
89 views

Water heater on concrete--should I build a platform? how much heat loss in winter?

I don't know if that title the best way to phrase the question. It's winter(ish) now, and I swear the hot water just doesn't last as long as it does in, say, September. The water heater tank is ...
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6answers
237 views

was in attic for an hour without mask. could this cause issue?

my bathroom fan was dropping water so i went up to the attic and applied fiberglass insulation to the bare metal vent pipt from the fan out to the roof. i was up in the attic for an hour wearing ...
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1answer
308 views

Draft from under baseboard - pull back carpet or remove baseboard to caulk?

Using an infrared thermometer/camera, I found what seems to be a draft coming from beneath a baseboard in the corner of a carpeted room. I understand that caulking can stop drafts from under ...
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3answers
136 views

Device to detect where heat or cold air is escaping or entering a structure

I would like to lower my environmental impact and reduce my energy bills by reducing areas where air might be entering or exiting my home. What type of device can be used to detect where heat or cool ...