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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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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2answers
536 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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1answer
342 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
98 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
763 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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1answer
315 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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1answer
202 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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1answer
372 views

Can I use a 5 mil blue tarp as a moisture barrier over a dirt floor in a crawl space instead of poly sheeting?

Can I use a 5 mil blue tarp as a moisture barrier over a dirt floor in a crawl space instead of poly sheeting?
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1answer
128 views

Properly insulating crawl space

Currently my crawl space has no insulation. The previous owner put gravel on the ground. I was told by my home inspector that I would save some money on energy costs. However, I'm not sure what's ...
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1answer
499 views

How can I add insulation above my finished ceiling?

What is the cheapest option for adding insulation above a finished ceiling? There has never been any in the spot that I need it. Should I take the roof off or have it sprayed in? The space is 20 feet ...
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1answer
55 views

insulation below fireplace

I was removing wood paneling in the basement to fix some seepage cracks and I noticed a huge space that was un-insulated. This spot had some pipes running through it and it runs right underneath the ...
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1answer
803 views

How would you repair this exterior foundation insulation/wrap?

A home I purchased, which was built in 2005 located in the upper Minnesota/US (frigid winters, balmy summers) has the larger faces of the above-grade poured foundation covered in a strange insulation ...
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1answer
268 views

Proper order of operations for re-doing windows, stucco, and footing insulation

I have three big projects coming up: Replacing all the windows and a sliding glass door Adding 2 inches of rigid foam insulation to the exterior and re-stucco-ing Adding rigid foam insulation ...
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1answer
94 views

Worth it to add footing insulation if there's already a thermal break?

I've been considering insulating the outside perimeter footings of my 1972 ranch house in northern New Mexico. The slab-on-grade it's built on (that constitutes the subfloor) reaches a temperature ...
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1answer
109 views

Is insulation blockinng airflow of my vented soffit?

I have insulation shoved in front of my vented soffit's should the insulation Be there It was already there when we moved I didn't think much of an till I started doing some research after I blew in ...
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1answer
209 views

Turning a mobile home with a basement into a recording studio

I recently moved into a mobile home that has a basement. The basement was an apartment, but had multiple issues with mold and frozen/broken water pipes. The owner was prepared to demolish the entire ...
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1answer
161 views

should i remove trim before caulking window

For weatherization purposes, is it worth removing the trim around windows (and sliding doors, etc) and filling the gaps behind the trim with spray foam (or perhaps caulk?), or is it acceptable simply ...
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2answers
270 views

Insulating attic with no soffit vents.

I just bought a house in northern Midwest where there's lots of snow and was planning on adding blown in cellulose insulation to attic space. Then I noticed that there are no soffit vents in the main ...
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2answers
255 views

Insulation to condition attic space

I have a two story 1916 foursquare home in Ohio with spacious attic and basement. Before I purchased it, the HVAC system was redone by installing two independent furnaces/blowers (one in the attic and ...
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2answers
5k views

Removable windows for the porch or sunroom

I have a potential project where there is a metal roof/awning/overhang supported by posts on the south side of the house. It is sort of like a car port, except there is no vehicular access to it (...
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4answers
148 views

What could cause a temperature variance between our kitchen and the rest of the house?

Our newly remodeled kitchen holds a temperature that averages about 5 degrees cooler than the remainder of the house. The house thermostat is set at 70 degrees, and the kitchen has been as low as 63. ...
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2answers
4k views

Can I insulate my soffit vents in the garage for the winter?

So I recently had a new 30x24 detached garage built and intend to leave it mostly unfinished. I live in Iowa and we have pretty cold winters here, which will be coming soon, and I'm looking for a low-...
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1answer
119 views

Can I insulate under my condo's subfloor?

My condo does not have a basement. I have a subfloor with three dummy registers. I don't know why they are there. My heating ducts are in the upper part of the side walls. In the winter the cold ...
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1answer
956 views

Will sealing off rafter spaces and unusable spaces help my attic insulation plan?

I am trying to warm an exercise floor in an unfinished attic and save on heating at the same time. I want to evaluate whether covering the rafters in my attic with various materials will be worthwhile ...
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1answer
627 views

Is blown-in insulation appropriate for on the foundation block in a crawlspace?

Our home has blown-in insulation on the foundation block in the crawlspace. I've never seen this before. The other homes in the area I've seen had foam board glued to the wall. There doesn't appear ...
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9 views

cooling and heating

We have A RASTRA built homeuilt in 2007, we purchased two years ago. We purchased a new HVAC system, all new windows and slider, but it is still super hot in the summer and cold in the winter, ...
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29 views

noise vibration happening everyday except saturday night

A few months ago, a low bass noise started and vibrates slightly the house. It started not too loud and since 2 weeks it got louder and constant except Saturday night. It does not let me sleep as ...
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9 views

How to install rigid foam installation w/radiant barrier under a cathedral ceiling?

I'm in the process of insulating my shed-turned-office. I've installed typical fiberglass insulation in the walls, and currently have some 8x4 sheets of rigid foam insulation tacked to the bottom of ...
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1answer
20 views

Roof Ventilation and Insulation - Midwest - Gable and Ridge vents only, no soffit vents

I have a 1920's home in Ohio, and have NO soffit venting in the house. There are 2 gable vents, with one small temp-controlled fan (set to turn on ~95 F or higher). There is also a ridge vent. The ...
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17 views

Applicability of cellular shades in a sunroom

I'm trying to keep my sunroom/solarium with a sloping ceiling cooler in the summer and warmer in the winter. Cellular shades seem like a good approach, but hard data is tough to find on the web - I've ...
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1answer
14 views

Attach XPS to back of stud framing?

In the basement that I'm finishing I have an irregular, rough stone foundation wall, pretty dry. I'll use 1" XPS foam insulation, then drywall. Can I build the framing on the floor, attach the XPS to ...
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1answer
43 views

Foam board insulation over drywall

Guys I am living in a 500 sq ft apartment built in the 1950's and it has a south facing wall. I run the 10000 BTU AC almost 24/7 and in the afternoons the wall is very warm if not hot to the touch on ...
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1answer
54 views

How can i stop heat

I live in a shop with my boyfriend, upstairs like a loft. We put up installations. We have an air conditioner running all day, but the room still gets too hot. No windows, just one huge door. What ...
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1answer
28 views

How to prevent moisture from ruining a climate-controlled wooden outbuilding

We are having a 16 x 24 x 8 wooden outbuilding built. We are making a home gym that will have a cooling/heating unit for climate control. We are worried about moisture causing damage. Looking ...
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1answer
23 views

Skylight insulation preventing heat gain

I have 6 - 4'x8' skylights in my showroom roof. its great for the winter but in the summer it radiates heat and glare into my showroom challenging my AC. I have had shade clothe as a cover which ...
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49 views

Creating 1" Air Gap between foundation wall and fiberglass batts

We just bought a house in Calgary, AB, Canada and noticed that the basement is below grade and is insulated with fiberglass batts. There is no drywall at the moment; hence, I have access to the vapor ...
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30 views

Is silica gel used for insulation in walls/floors/ceilings?

Silica gel has great insulating properties (video). Is it used for home insulation? If yes, which products are available?
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37 views

Installing moisture/weather barriers around home/ doors and windows

What is the proper way to installed moisture/weather barrier around doors and windows in southern Louisiana?
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20 views

Under-floor Insulation in crawl space?

We just bought a single story house, pier and beam at grade level over 36" vented crawl space. The house is located in the Portland, OR area, was built in 1972, and never had vapor barrier or floor ...
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0answers
24 views

What type of insulation should I use for varying joist spans of 3-4ft?

I live in the #3 region in California, and am wondering what the most cost effective and functional DIY method for installing insulation under my floors. I have kneeling room crawl space under my bi-...
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25 views

Attic insulation problem

I am wanting to insulate my roof rafters and finish over it with Sheetrock but it's just my rafters directly to my roof metal, what do I have to do to my roof metal do I can insulate and not worry ...
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1answer
43 views

What type of garage door seal is this?

Is this a type I cannot find, or is this just a normal flat rubber type that has been shoved into the kerf cut, folded over, and stapled? If the latter is the case, any idea why someone would do it ...
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1answer
83 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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2answers
222 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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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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164 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
160 views

Insulation and Vapor/Moisture concerns with a wood ceiling.

I have already removed the drywall in the ceiling so the rafters and bat insulation is currently visible. I plan to be adding plywood to the ceiling and then installing 1x6 boards on top of the ...
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0answers
29 views

Insulating attic - vapour barrier question

My girlfriend has her parents 61-year-old home in St. John's NL and it has an attic with poor ventilation and unfastened R-12 kraft-faced (and facing up) fibreglass laying on the original drywall. I ...
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329 views

Is it worth spending extra on R14 or R20 fiberglass insulation

I've put in 1" Type 1 polystyrene (estimated at R3.75) around the exterior walls and I'm deciding which insulation to use in the framing. The R12 works out to $.38 p/sqft The R14 works out to $.54 p/...
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84 views

Faced or unfaced insulation in floor above unconditioned crawlspace?

I'm insulating my floor. I live in a dry climate with cold winters and R-30 is recommended. I am insulating from below so cannot staple the facing paper. What is typical for this application? ...