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 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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33 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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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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29 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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34 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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40 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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41 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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16 views

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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30 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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59 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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51 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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65 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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28 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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59 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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23 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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74 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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48 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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36 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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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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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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69 views

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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35 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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68 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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25 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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164 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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44 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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73 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
171 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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136 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
100 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 ...
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2answers
132 views

Can I insulate my exterior walls myself using blow-in?

I live in western Washington, where we see plenty of rain, but only a month or two of freezing temperatures each year. My exterior walls are drywall with horizontal wood siding. I feel crazy as I ...
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76 views

sliding door leaking air, is it installed correctly?

I have 2 very newly installed ( < 1yr) jeldwen sliding patio doors (aluminum clad) , and I found that they are leaking air on inside around the bottom and side edges of trim. I am wondering ...
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64 views

rigid foam board in basement with exterior guard overkill?

I'm finishing a basement and have 8 foot and half concrete walls that I will be placing a stud wall in front of. I've scoured the net only to find a large number of opinions. My basement wall has an ...
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139 views

Rim Joist Insulation without a Sill Plate

I've seen a few similar questions but the answers don't add up... I would like to use some rigid foam insulation to insulate my rim joists. Here is the problem: everything I have seen shows putting ...
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64 views

how do i improve the temperature of my sons room?

i have a house in new york and i have insulation with paper backing in the attic. My room which has the thermostat is always 4 degrees warmer than his room which is situated over the living room can i ...
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3answers
106 views

Best way to air seal, vapor seal, and insulate exterior wall in old house?

I have a 90-year old house in Seattle. Exterior walls are constructed as follows: lath and plaster, uninsulated 2x4 stud bays, plank sheathing, cedar clapboard, 1" foil-faced styrofoam, vinyl siding. ...
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25 views

Fragile paperback on cellar ceiling batts

Installed in 1968, these insulation batts now fall, or hang. The paperback has become so fragile the insulating weight pulls it apart. What suggestions for a remedy? Replace? Or?
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93 views

Insulating near a breaker box

Hello: In remodeling my basement I have so far finished installing R-10 2" XPS insulation against my block walls. My question is: How close or how far away from the circuit breaker panel can I place ...
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91 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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71 views

which layer of rigid foam should i caulk when insulating rim joist?

I am insulating my rim joists with rigid foam board in a manner similar to that described on the familyhandyman's website. I am considering adding a second layer of foam board to get closer to the ...
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52 views

Strip on side of window letting cold air in

My apartment bedroom window has a thin vertical strip along the right side that allows warm air from the room to escape. Even with the bedroom thermostat set to 80 degrees, the room hasn't gone above ...
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51 views

How can I stop an in-the-wall air conditioner from leaking air into the home?

As far as I can tell, the air conditioner fits nearly perfectly in the hole, but there is considerable air leaking into the home through the bottom. I think it may be because of metal strips that line ...
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38 views

How do I dry up a stucco wall that presents efflorescence?

I have determined the source of the water and I would like to believe that I stopped that with a temporary fix (a large tarp that will cover my patio which used to collect water at the base of the ...
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1answer
73 views

Is sealing via tape necessary for knee wall foam board insulation.?

I have dramatically improved the ventilation and insulation situation in my house's knee wall attic space, but I have one concern. I nailed up foam board over the studs and fiberglass batts. Do the ...
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563 views

How do I insulate my garage ceiling?

My garage gets really cold in the winter and I'd like to insulate my ceiling and/or roof. Here is my ceiling I store quite a bit of things in the ceiling, so the idea is to insulate the inside of ...
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37 views

how to fix the dry wall inside of the outer wall ? and what is brown glossy paper in between drywall and insulation? ?

I just found a mold in the bottom corner of my house inside of outer wall. I cleaned mold with bleach and cut the corner. is there any specific way to fix the dry wall of outer wall. Also plz what ...
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37 views

What type of insulation can be used near knob and tube wiring?

I have a house build in the 1920's. I recently had a HVAC system installed, and i have to insulate my actic (Unfinished). The three bedrooms and one bath on the floor below have a center ceiling ...
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158 views

How can I close off crawl space vents for the winter?

My exterior air vents are still letting air into the crawl space, even after being closed for the winter. I've seen the suggestions for wedging plywood over the air vents to further block the air, but ...
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128 views

Should I install the exhaust hood outlet through the chimney or house wall?

What are the advantages and disadvantages of implementing an outlet of a kitchen exhaust hood through a chimney or directly through the outer wall of the house? There are unused chimneys in the house ...
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37 views

How do we properly insulate a loft ceiling with 2“ by 4” without loosing space?

We have recently started a home improvement project that involved completely redoing all of our vaulted ceilings. We have a loft area that was about 6 foot in height at the peak. When we did the demo ...