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Questions tagged [insulation]

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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2answers
2k views

Is dirty batt insulation on attic floor a sign of air leakage?

My attic is 530 sqft, with soffits, ridge vent and some 18"X18" window with mesh over it (I cant recall its name). The house was built in 1960 and has batt insulation on the attic floor. The batt ...
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8answers
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Are curtains effective for keeping the room warm?

I live in a rented apartment and I am trying to find solutions to keep the heat in. The apartment has several big windows (the 'living room' has one wall that is 80% windows) and I have to run the ...
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2answers
157 views

Why don't conduit fill rules apply to cables encased in closed-cell foam?

I have a question that is more theoretical in nature. I know that when you have 14/2 cable and put it in a 1/2 conduit you are above fill (or just at max fill). The NEC cites that this is in part due ...
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1answer
62 views

A more thermally efficient house - can I block up vents in my brickwork?

I live in the UK in a typical '1930's semi' house. It is built with two layers of good old bricks and a cavity wall inbetween them. In my hallway, there is currently no carpet or hardwood flooring - ...
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4answers
779 views

How should I air-seal this gap by the floor along an exterior wall?

There's a gap between some of my floorboards and the baseboard: The gap isn't just cosmetic. I used a wooden skewer to probe the hole and was able to insert it around 6 inches in: This is an ...
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3answers
180 views

Running romex in 20" attic space using pipe hangers

My drywall ceiling is attached to 2x6 joists 16" OC. Then, a 10" air gap above these joists are the 2x6 rafters 32" OC, for my flat roof just above. Even though the home is 1955, I have knob & ...
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0answers
26 views

Unfinished basement in Georgia townhome; would vapor barrier on interior trap moisture?

I have a town house that is a middle unit on a slab. The back wall is above grade, with exterior windows and door. The sidewalls abut adjacent units, so there is no wall in contact with soil for the ...
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1answer
58 views

Is partial double glazing worthwhile?

My house has single glazed windows. I understand that bubblewrap can act like double glazing, however doing this will ruin my views. Is there much advantage in only covering part of the Windows (say ...
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237 views

Open cell spray foam off gassing 2 years later. How to fix?

My home was built in 2017 and has Accella open cell spray foam in the unvented attic. In spring & summer 2018 we noticed a mild chemical smell coming from the attic on hot and/or humid days. It ...
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2answers
29 views

Insulating garage

Dallas, Tex. Building a new home. Builder does not insulate garage. We had a friend put in r-13 faced but he installed it paper side against sheathing on outside wall. Is this ok?
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4answers
266 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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4answers
121 views

What is the best way to insulate cold water copper pipes exposed on a flat roof in California

We live in Los Angeles and have a flat roof that our hot and cold water copper pipes run across and are all exposed. The cold tap water, in the spring, summer, and fall is so hot during the day. ...
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1answer
771 views

Can rigid foam board have an air space between it and the studs. Basement wall

I finishing a part of my basement and I want to put rigid insulation>studs>batt insulation in stud bay>drywall. I have a wall that has copper pipes, pvc pipes, and gas pipes flush to the concrete ...
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1answer
30 views

How to insulate the inside of a door

I am building a sliding door with a frame made of 2x2s covered with plywood panels on each side. I would like to make it reasonably soundproof and was planning on filling the void with some insulation ...
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0answers
23 views

Insulating a steel outbuilding, first major DIY project

My parents just bought a house. My dad, a disabled vet spends most of his time in his workshop. His new workshop is a 700 sq ft steel outbuilding that has no insulation. I have a local AC company ...
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1answer
27 views

How to replace UFFI insulation in walls with no access from basement or attic?

I recently bought a house, and had an energy assessment done which determined that my exterior walls have old UFFI insulation that is rotting away, leaving substantial gaps and allowing heat transfer ...
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2answers
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noise reduction from a wooden ball wall

My husband and sons built a wooden wall in our backyard to use as a ball wall for soccer and lacrosse. Our boys bounce the ball off the wall to practice. It is about 10X10 frame with plywood affixed ...
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3answers
17k views

How should I insulate a bedroom in the attic?

After doing lots of research and reading lots of different opinions I would like to know what is the best way to insulate and vent a 1 1/2 story house that has a bedroom upstairs in the roof/attic ...
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3answers
3k views

If I blow insulation everywhere in my attic except the door trap, will heat escape through it?

I want to blow insulation into my attic. The door into my attic is on the floor and made up of a large board which doesn't have hinges. I have to push the door up and slide it over in order to gain ...
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2answers
78 views

Pipe not straight, touching another pipe - possible fixes

Problem: hearing clicking metal noise when water-based heating is on. Because this sound travels so quick, it was very hard to find the spot, but finally found it - right below the outlet. Opened the ...
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2answers
38 views

Insulating a replacement insert window

It seems that if I want to properly insulate our windows, I need to choose a full-frame window replacement vs an insert. Since our house has stucco siding, I fell this may quickly get more ...
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1answer
56 views

What is this picture of an insulation blower showing?

This seems to be showing a guy aiming a cellulose insulation blower at an open wall, and somehow the insulation is sticking to the wall in perfect strips. What is really happening? This is from the ...
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2answers
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Cape Cod Insulation/Snow Melt [closed]

Is the melting pattern on this roof a sign of really poor insulation in the knee walls? Thinking about purchasing, but I don't want to spend my life fighting a poorly designed/insulated house if it's ...
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2answers
77 views

Root cellar insulation

Building a root cellar in corner of full basement. No water issues. Humidity is relatively low in winter (SW Montana). Details: The root cellar will be located inside a full basement . The basement ...
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3answers
988 views

I rented an insulation blower. How do I get the insulation into the attic?

Apparently the blower weights 150 lbs and I'm not sure if I can get it up into the attic. Or, perhaps, are the hoses long enough to reach all edges of a 1000 sq ft attic without requiring the blower ...
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1answer
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How are Clopay Intellicore garage door R-values so high?

Clopay's garage doors with their proprietary "Intellicore" polyurethane foam insulation claim R-values as high as 20.4 in a 2" thick door, or R-10.2 per inch. State-of-the-art spray polyurethane ...
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0answers
55 views

What are the minimum insulation code requirements for a steel arch building (Quonset hut) used as a residence?

I'm interested in building a steel Quonset hut home in central Texas. I've done a fair amount of research on what's involved, but I'm stuck on insulation. The IECC defines minimum insulation ...
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5answers
1k views

Ok to add cellulose over blown fiberglass insulation?

I have an attic with blown in fiberglass insulation, probably original and 27 years old. The attic appears to have had some moisture issues in the past (bathroom vents being vented out of the soffit ...
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0answers
25 views

Rigid foam board between flat roof rafters

I have a bedroom I am renovating with no insulation. So I took down the ceiling and towards the back of the house the roof rafters actually almost line up with the ceiling itself. I thought that ...
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1answer
53 views

Would mylar provide adequate insulation for an infrared sauna located outdoors?

I'm planning to purchase a portable indoor infrared sauna to be located outdoors under my deck. Although ambient temperatures in the SF Bay Area are fairly mild, I am concerned that it might take ...
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1answer
234 views

How do I insulate my unfinished basement with half foundation, half siding?

I have a 1910 bungalow with an unfinished basement. The issue I'm encountering is that the main floor gets extremely cold in the winter and requires a lot of heat ($$$) to keep it warm. The unfinished ...
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1answer
33 views

Our top floor is finished/heated. How to prevent ice dams?

I'm in snowy Minneapolis, living in a 3-story house built in 1886. The top floor is fully-finished and heated, and there's no attic. We've been getting crazy ice dams this year, but not previous ...
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1answer
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How thoroughly should I scrape paint from cement basement wall before insulating?

I'm going to finish one corner of my basement and want to insulate the two adjoining exterior walls so that the space will stay warm in the winter. The wall was painted a few years ago and the paint ...
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1answer
3k views

How can I install r-max insulation on the interior side of a cinderblock wall?

I am planning on insulating the lower level of my house with R-Max in a method similar to this: I have a few question about it though: Can I use something other than Treated wood as this is going ...
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0answers
33 views

How would insulate/fill this large enclosed area behind my gas fireplace

I’m currently remolding most of my bathroom because I found some black mold behind a shower tile and then there just kept being moisture the more I uncovered. After opening the wall behind my ...
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3answers
60 views

Insulating between floors?

I have a "modern" UK house (approx. 15 years old, built as cheaply as possible, a wooden house with a brick shell). If it is cold outside and I heat the ground floor to the minimum I would like, then ...
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1answer
153 views

Does this look like loose fill Asbestos?

I found some type of loose-fill insulation stuffed behind standard fiberglass insulation while cleaning up my basement. The home was built in 1947 and I'm not sure if what I found is Asbestos (see ...
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1answer
64 views

Do you run a conduit under or over concrete wrap in the basement?

My basement concrete wall is covered with a concrete wrap and is anchored to the wall. The walls are unfinished. If you want to add an outlet down the wall to a workbench, do you run the conduit ...
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1answer
42 views

Refrigerator Side Wall Hole Closure - Need suggestions

In my side by side door refrigerator, there is a hole in the side wall on the right compartment that is intended for letting controllable amount of air from the lleft / freezer side of the ...
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2answers
51 views

Can I add insulation to exterior home walls without redoing all the drywall?

I recently bought a house and Ive found out the insulation is not good enough in the exterior walls. Is there a way that I can just cut a small hole and maybe blow in insulation into the walls ...
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4answers
21k views

How do I seal my baseboards from drafts?

Some rooms in my house have a pretty bad draft along the edge of the floor, where it meets the outside walls. But I am less than thrilled (to put it mildly) about the prospect of ripping out carpeting ...
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0answers
67 views

What's the best method of insulating windows against solar heat?

(TL;DR at the end ;) ) I live in Western New York, and while it's pretty uncommon to reach temperatures over 95-100, it still gets pretty hot here, and we typically have 70-90% humidity on top of it. ...
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4answers
126 views

Should I add a vapor barrier in this situation?

I'm finishing my basement. I am wondering about the north wall which is a 2x6 stud wall (walkout basement). I removed the fiberglass insulation an put 2 layers of 3/4" rigid insulation (sealed edges ...
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5answers
44k views

Are there any dangers associated with rigid foam insulation?

Is there any danger of bad fumes/gasses being released from polyisocyanurate or polystyrene rigid foam insulation? I'm planning on insulating my bedroom from the inside (ie: putting the insulation ...
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1answer
138 views

What is the recommended method of insulating PEX piping?

During the winter chill here in DC, one of my pex pipes that is not insulated and basically exposed to the elements cracked. I blame the contractors who didn't insulate and finish the job, literally ...
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6answers
38k views

How can I insulate my attic on a tight budget?

My attic is running 135Fahrenheit (55 Celsius) and more right now. And that's before it even gets to the hottest part of the day! The A/C guy said the A/C's are working perfectly. But he tested the ...
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3answers
70 views

Is insulating basement ceiling or first-floor walls more effective?

In an old house with plaster walls there is a large room on the first floor with wood floor. The walls are not insulated. The basement has no ceiling, so you just directly see the subfloor of the ...
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0answers
27 views

How do I insulate between bottom/top apartments?

My house is a two-apartment house, where I live on the first floor and rent the second. It's an early 1900s plaster & lathe, and currently has no insulation. I want to add rockwool in the ceiling ...
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1answer
24 views

Should loft insulation cover wall cavities?

When insulating a loft at ceiling level with mineral wool type material, should the insulation cover the exposed wall cavities for external walls?
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2answers
55 views

Brick wall insulation

I moved into a 30 year old house this fall. The bedroom at the front of the house is colder then the others. Two sides of the room are brick exterior walls vs siding. I was in the attic running ...