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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9k views

Will adding a cool air return in the basement help with summer AC power usage?

Pretty much the title. I have a full basement. Part of it is unfinished and has the water heater, furnace, and washer / dryer. The other part (roughly 1/2 of the total space) is partially finished. It ...
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Does this insulation need to be replaced? Does it contain asbestos?

This is a 60y old house but I am not sure when the bathroom that is downstairs was built this is in the ceiling and I would like to know what sort of insulation to use the bath tub that I just ...
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87 views

Room above garage cold

I have a room over an attached garage which gets much colder than the rest of the rooms. I think there is no insulation in the garage ceiling (I haven’t checked it yet). I saw some suggestions online ...
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How can I insulate under flooring panels in my attic?

I am removing the original barely-still-there insulation in my 1950 attic (S. Cal.) and then sealing and then placing R 30 fiberglass batting. A problem I have is that about 5%-10% of the attic is ...
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insulating under stair

Following on from my another question, I'm now looking to add insulation to my under stair storage cupboard. I want to add insulation to the back wall and floor. There is a damp proof course on the ...
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1answer
67 views

Insulating slab garage door

I have flat slab garage door that I want to insulate. I saw many videos online and they suggest using garage door insulation kits. However in all the videos I saw the garage doors has the groove that ...
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47 views

West wall of house in Phoenix is cinder block with no insulation. How can I insulate it?

A north/south situated single level townhome in Phoenix has a west facing wall that bakes in the summer heat. It's about 10' tall. The interior walls are 8'. Both bedrooms and bathrooms are ...
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2answers
565 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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Under-slab insulation vs. slab perimeter insulation

Currently in the final planning stages of my new house ("raised ranch" style), and the first floor is going to be slab-on-grade. My current insulation plan has 2" of XPS under the slab across its ...
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325 views

Garage remodel: can I leave garage door in and put an insulated wall in front?

doing a garage remodel and wondering how best to keep the garage door on facade and still be able to have A/C in the garage? I live in hot and humid south Texas. Is this a ridiculous solution to ...
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How can I insulate the door to my attic?

I have a 5 level townhouse; heat seems to come out of the area around the door to the attic in warm days. is it possible to add insulation to this attic and door? the attic is walkable and has plywood ...
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What kind of exterior wall insulation is this?

After some searching, I'm guessing it might be "encapsulated" insulation but I don't know. It's unmarked and, as you might see, it's it's tucked into the corner and bulging in the middle. I ...
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Sealing a tilt type garage door

I've got a tilt type garage door with gaps on the side. I've sealed the top and bottom, but I'm not sure what to do with the sides. I've googled a bit and it turns out that it's recommended to just ...
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Installing Roof - What else should be done?

When installing a new roof, what other work would be convenient to do? Since I'm having a new roof installed, I'm curious if there is something I would regret not doing in a few years. Potentially ...
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Can drywall be attached directly to foam insulation or do furring strips need to be between them?

I have a basement wall that was recently finished with drywall and insulation. Instead of attaching the drywall directly to furring strips with foam under the furring strips, the drywall was attached ...
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How do I staple faced insulation to ceiling joists if the flange has been cut off for narrower spaces?

I'm insulating a detached home office/shed. For the ceiling, the rafters are 24in on center so I got 22" faced insulation for that. However on the ends of the structure, the rafters are only 21in ...
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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
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Rigid foam board expansion

I’m installing extruded polystyrene rigid foam board over my exterior sheathing. I got a little behind schedule and now the temps have dropped to the 30s (Fahrenheit). Do I need to allow for the foam ...
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1answer
21 views

Finishing attic with static vent

I have a 1920s building with a gable roof that has a 10' peak. I'm going to finish the space and had an engineer detail the specs for structural safety, but I'm stuck on the appropriate way to provide ...
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795 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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462 views

Can spray foam be used between Rim joist and exterior sheathing?

I have a 40 yr old single story modular home set on a block foundation. I used a thermal temperature gun to verify a temperature difference. the insulated wall is approximately 1 to 2 degrees cooler ...
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3answers
66 views

Is there a measuring method for determining of the real thermal conductivity of a building component?

We would like to determine which elements of building are to be renewed or changed. Among other things, we want know which elements are subject to a specific heat transfer. Does exist a measuring ...
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Can a wood cabin be laid directly on a existing concrete foundation if a DPC is added?

I am figuring out the foundation for a small wood cabin for my back garden, due to height being a premium I was wondering if I could put the wood directly on an existing garage foundation. Providing I ...
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87 views

Sistering 2x8s to 2x4 truss system for vaulted ceiling?

The Question (see pic below): Can I safely sister 2x8s to a 2x4 king post truss/open rafter system to achieve an insulated open ceiling/vaulted design. The Details: I have a garage that is 18 feet ...
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1answer
26 views

How can I insulate my porch floor?

I have a wooden screened-in porch on a cabin that I am remodeling, with approximately 30 inches from the ground to the bottom of the porch tongue-and-groove boards. I am considering insulating the ...
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4answers
691 views

Greenhouse subfloor (greenhouse on top of concrete) — best material?

I'm putting together a greenhouse, 10x13-feet base. Unfortunately it will be on a concrete-paved section of my backyard, and I know it will lose a lot of heat to the ground via conduction in ...
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49 views

How to solve Hot Upstairs but cold basement

I have central air in my house(20 year old house). In my basement it gets cool, and cold air is coming from a vent in the ceiling. My upstairs gets really warm and humid even though central air is on. ...
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1answer
169 views

alternate or no Insulation over heat tape

Can I operate a well pump with no pressure tank by using the breaker as a switch? I have about 10 feet of well PE black pipe from the ground in the crawl space to the utility closet (inside heated ...
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1answer
54 views

Faced or Unfaced Fiberglass in a basement stud cavity that has IPS Foil Board?

Insulating in Zone 5. Basement is 90% below grade, maybe 8" to 12" exposed foundation around the top of the basement wall. Applying R-6 Foil Faced Poly Iso to the poured concrete wall, then ...
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1answer
61 views

My oven insulation is burning when I bake [closed]

My oven burns every time I bake. The insulation always seems to light up when I use it. Also, some rats infested it a while back and really caused damage but they all died.
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1answer
23 views

Insulation with multiple polyester layers instead of one

I am getting 3cm thickness polyester sheets for free and while it could be great not having to buy insulation myself, I wonder is it a good idea to insulate it with multiple layers of these sheets for ...
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Vapor Barrier Under Insulation on Attic Floor

My brother tore out the mdf tile ceiling of his cottage and nailed down ~1x6 pallet wood on top of the ceiling joists in the attic. There are large gaps in the boards. On top of the boards, he rolled ...
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133 views

How should I insulate a poured concrete exterior wall?

I've recently had to remove existing drywall and insulation in my condo in Ontario. Now I need to finish the walls. I was thinking of: Gluing 2-inch Durafoam to the concrete Putting in the proper ...
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1answer
419 views

Are you supposed to put a vapor barrier on both sides of the common garage wall (wall between garage and house)?

In my garage, the wall between the house and the garage has visible studs and insulation in it. This insulation is 50+ years old and I am going to tear it out and put in new insulation. My question ...
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1answer
31 views

Faced or unfaced insulation

So my house was built in 1957, I have shiplap siding and behind black boards that are fireproof. On the photo you can see the exterior wall where these boards are. Should I use unfaced insulation or ...
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1answer
26 views

HVAC: hot attic, system off, heat leaking in from supply vents

It’s summer, the attic is hot, our HVAC system is off, but hot air seems to be slowly coming in through the supply vents, making the upstairs bedrooms hot. It’s certainly normal for some warm air to ...
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33 views

Possible moisture issue with partial insulation of unheated garage

I live in a zone 5 area in Ohio in a house build in the 60s. The garage is 20x20, attached to the house on two sides and shares a roof with the house. Current garage isn't insulated - the attic has ...
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1answer
37 views

Plumbing re-routed through attic

We recently had a leak under our slab foundation and ended up going with rerouting the plumbing through our attic. After it was done, we have noticed that there is now a distinct odor (of the PEX ...
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268 views

Would insulating a door between my closet and attic help keep the closet warmer?

In our new home, in the back of our closet the previous home owner had put that flimsy thin wood paneling as a wall in between the back of the closet and where the triangular part of the roof is about ...
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1answer
30 views

Type of insulation for flexible aluminum duct?

I’m replacing an undersized bathroom exhaust fan with a larger one that has a higher CFM. When switching the fan out, I want to add insulation to the flexible aluminum duct that goes from the fan to ...
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35 views

How to insulate a crawl space without an access point

I have a cottage that has recently been completely renovated but later learnt that the floor was not insulated because there isn't an access panel. The cottage doesn't have a crawl space the area ...
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2answers
45 views

Will replacing windows significantly reduce solar heat gain in summer?

A friend of mine is remodeling his 1980s house and was asking advice about keeping it cooler in the summer. The house currently has the original double pane windows, many of which have "popped&...
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3answers
39 views

How can I cut slots in the ground to install insulation panels?

To build a geothermal greenhouse, I need to insulate a thermal mass -- basically the ground directly the greenhouse. The insulation will be for the underground "walls" only, no floor, and 5 ...
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2answers
106 views

Is it okay to insulate some but not all steam pipes coming from boiler?

I have a Slant/Fin boiler with un-insulated pipes in the basement. The previous owners of the house finished part of the basement and covered some of the pipes behind drywall in the ceiling. Is it ...
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2answers
144 views

Insulating a Wall Against Unconditioned Attic Space

I'm looking for help in insulating my 1950s San Diego house. A second story was added in the 70s and a gas furnace + A/C was added about 10 years ago in the unconditioned space above the downstairs ...
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1answer
47 views

Doors to uninsulated walk-in spaces

I have two 32" doors in my house that lead to uninsulated storage rooms. I'm concerned about my utility bills, and I'm wondering if these doors are appropriately insulated. What kind of door should ...
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45 views

Exterior Wall - Stacking Fiberglass insulation and Mineral Wool insulation

I am in the process of finishing my unfinished basement and had a question about stacking insulation. When framing the basement we realized we have alot of areas which have about 6~ inches of extra ...
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1answer
41 views

Insulating and framing a basement after drain system and plastic vapor barrier installed

We had a moisture problem in our basement located in Minnesota. Recently some foundation water came up and ruined our carpet, when we tore out the drywall there was moisture build up and some mold on ...
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2answers
112 views

Air-sealing the eaves

I am trying to insulate and seal the eaves of a vented roof over a log house in order to protect the thermal insulation (flax batts in my case) from the outside air and liquid moisture (not vapor). ...
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3answers
86 views

Can insulation touch the roof sheathing in a sloped garage roof without soffit vents?

I am beginning to install fiberglass insulation in my garage and want know if I have done the ceiling wrong. The issue is that the insulation touches the roof sheathing in the sloped area below that I ...

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