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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76 views

Insulation challenge - exposed wood beams with 6" tongue/groove slats on top form ceiling with attic above

1950s Los Angeles ranch style house with 32F lows in winter and 95-115F highs in summer. Ceiling above family room has exposed 6x6 wood beams with 1x6 pine tongue and groove slats resting on top. ...
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My basement wall is adjacent to a filled foundation. Is there any point in insulating?

I was planning on putting foam board insulation on my basement walls before finishing. Then I realized that on the other side of the wall isn’t earth, but a poured foundation for my covered porch. ...
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Restoring steel casement windows

I’m dealing with some 1930’s era steel casement windows, Tudor revival style, that are in reasonably good shape for the most part. They need some maintenance and would like some suggestions for how ...
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What kind of glass should I use for insulating a garage door window? [closed]

While insulating my garage door, I'm considering replacing the existing plain glass with something better. I'm considering replacing each pane, or simply attaching a second layer on the inside of the ...
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241 views

What's the best way to insulate an attic with 2x4 joists?

My 1938 home currently has zero insulation (aside from a few fiberglass batts haphazardly tossed about). The ceiling joists are 2x4 (spaced 16 inch OC), rather than the more modern standard of 2x6 or ...
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66 views

Insulating shower stud corner

I have a corner in a shower location that butts up against one exterior wall of the house, and as you can see there it is enclosed yet there is no insulation in there. What is the best way to insulate ...
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If it is not going to actively heated or cooled, is there any value in insulating a garage?

In Southern California, during new construction with a finished garage, the cost of adding insulation at this point should be low. But if the space will not have any active cooling or heating ...
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33 views

Dumb insulation question

I need to install an attic floor in my workshop - currently the rafters are exposed. I plan to use 3/4 plywood, then run faced insulation, then install a ceiling at a later date as time permits. As ...
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49 views

Can I flatten nails from house siding?

I'm doing some work on the inside of an exterior wall. It's covered in nails from the siding on the outside. I know you're not supposed to flatten these kinds of nails when used in roofing. Is it ...
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157 views

Vapor barrier behind electrical panel?

My electrical panel is mounted on bare studs of an exterior wall in my attached garage (living space above). The garage is not insulated and it does not need to be (except for the ceiling which will ...
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31 views

Insulating inside on an exterior brick wall

I have a city house that is over 100 years old and the bedroom has two exterior walls made of brick. Inside the walls are plastered over. Normally, I would just add 2” framing and use polyiso foam. ...
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35 views

Insulation and roof venting

I am in the process of finishing my bonus room (attic space above the garage). There are soffit vents and a ridge vent. If I put insulation in between the rafters before I drywall the ceiling, will ...
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Which is the better first step: rebuilding a basement closet, or insulating the basement walls?

Recently closed on a split-level. The majority of it is well done, but neither my wife or I were content with the basement. It was partially finished, with a closed off utility room, some hideous ...
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What are some quick and affordable insulation solutions for a shed?

I'd like to use my wood shop in the winter. It's a detached, 20x14 shed and I installed a 5000watt garage heater already but it takes a while (hours) to heat up and it's probably very wasteful since ...
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71 views

Should I insulate the ceiling of a room in an attic with an insulated roof?

My walk-up attic is insulated with spray foam along the roof line. The spray foam delivers an R value of about 20. The attic is finished, and the rooms inside the attic have a drywall ceiling that is ...
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Insulating townhouse's attic sidewall?

Last winter, I've had some issues with ice dams on my roof. I live in a townhouse in Southern Quebec, Canada, in the middle unit, where lately temperatures during the winter can go anywhere between -...
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582 views

Getting Ethernet Cable Through Exterior Wall

I am looking to run Ethernet cable outside my house. I have already found this question on running Ethernet cable outdoors, but it does not cover the best way to get the cable there. Ideally, I would ...
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Should I install fiberglass batts underneath my existing blown fiberglass?

I have loose fill fiberglass insulation in my attic (picture below). I was thinking about upgrading the insulation because, from what I've read, this is one of the least effective insulation types. ...
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42 views

What kind of glue should I use for insulation to wood?

I've got an unusual DIY underway. I'm making my own billiards table (pool table) cover. I started out cutting down two 4'x8' insulation sheets to set inside of the table's bunkers. I had to use two ...
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41 views

Should I replace amissing insulation over the heat tape on my water pipes?

I recently moved into a mobile home and with the temperature dropping below freezing I wanted to make sure my water line was protected. It has a electric heat tape wrapped around it with insulation. ...
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How should I insulate and block moisture inside rim joists where foamboard doens't fit?

My question is around the use of foamboards in finished basements to serve as a vapor retarder and to reduce condensation. I've already fastened foam boards against all the concrete walls, taping the ...
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33 views

Ceiling material to use on cold joists

Finishing off our large attic space and we went with 3" of closed-cell spray foam (hot roof application) on the slanted ceilings. My concern is heat transfer through the joists. We live in MN and ...
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127 views

I have R-13 exterior insulation around my foundation. Do I need more inside to finish the basement? [closed]

My home was constructed in 2016 with exterior insulation around the foundation (see image). They also put in this hanging batt fiberglass insulation on the inside of the walls, which seems superfluous....
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49 views

Using wool curtain in gardenhouse

We got a very nice and large piece of wool, and it would be perfect to use as a separation curtain in our small gardenhouse. Somebody (not an expert, and not from experience) told us that somehow ...
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34 views

what is good material for 100C to 130C for heat box [closed]

I am trying to design a small box (25" x 25" x 25") for an uniform heating oven. I am planning to heat around 100 C (212 F) to 130 C (266 F). I was searching for several material such as green board(&...
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Why do I have Insulation in internal wall between two rooms?

I have been carrying out a bit of DIY in my bathroom, in a new wall which was put up with my loft conversion which happened of the winter. Inside this new wall, I've found a significant quantity of ...
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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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Will 3.5" polyiso keep my electrical cables from melting?

I am converting a room into a sauna that will frequently be very hot (100+C). It has some wiring -- a few outlets and a light, from its previous use. The insulation for electrical cables is rated up ...
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85 views

How should I remove closed cell spray foam insulation which has shifted the framing?

We had our basement spray foamed last week and when the foam expanded it pushed out a 2foot section abound an inch from the block wall is there an easy way to remove part of that foam and push the ...
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44 views

Blowing in Wool Insulation

We bought a house in Northern Arctic Minnesota last summer. After outrageous propane consumption this last winter I decided to check out the insulation in the attic. This summer a leak developed and ...
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51 views

Can I add insulation over the original layer in my new home's basement?

I am looking to finish the basement in my new house that has insulation wrap installed in the basement. The insulation wrap is an R12. After studding the basement can I add additional installation ...
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66 views

Want to update insulation in knee walls. Pictures of the inside. I think it might be worth taking the old out and redoing it all, thoughts?

I purchased a house in the Metro Detroit area. 1943 built. Cape cod bungalow, pretty sure. Last winter, I had pretty bad ice dams and would like to re-insulate the knee walls before it gets too cold. ...
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30 views

Combining polyiso and mineral wool for class A fire rating

You aren't supposed to install Polyiso in your house without putting something like drywall in front of it in order to meet fire code, unless you're using something like Dow Thermax which meets fire ...
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Possible for polyiso to outgas CFCs through aluminum vapor barrier?

If I use polyiso foam board insulation in my sauna and completely cover it with aluminum vapor barrier / tape, creating a seal, will it outgas dangerous CFCs into my sauna at high temperatures? What ...
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147 views

Crawlspace Insulation Upside Down Replacement

I have an upcoming project and would appreciate any input. My crawlspace in Maryland had insulation installed upside down (face paper towards ground) and is now rotted/mildewed/falling from the ...
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57 views

How should I insulate a cement exterior wall

I've recently had to remove existing drywall and insulation in my condo in Ontario. Notwithstanding the place being built 86, what was put in place was creative at best. Removing the wall revealed ...
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167 views

Subfloor: styrofoam insulation between sleepers or strapping on top of styrofoam?

I'm building bedrooms where a basement garage used to be. The floor of the former garage is a concrete slab that I have resurfaced. My plan is to install OSB subfloor and paint it for now, probably ...
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Is a combination of sheet EPS and closed cell foam between rafters feasible as a combination?

I am in Central Texas. It gets hot, anywhere from 14-45 days over 100 degrees Fahrenheit in this area. And, it gets cold. Last February 4th it actually snowed enough for me to cross country ski on ...
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Is electrical tape enough to insulate contact that may be touching wall?

I have a 3-contact switch like this. As you can see, the switch doesn't have an OFF position, it diverts the current either between middle and left, or middle and right contacts. Had to attach it ...
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Insulation for crawl space with framed wall and foundation

I am encapsulating my crawl space, but not sure what to do with walls above the foundation. At least part of this area could have been a basement I guess, but I am needing to deal with this area due ...
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Damp Proof Membrane on suspended timber floor

I am about to start a project to install underfloor heating on the ground floor of a 1930's built UK house. The downstairs is a suspended wooden joist (50x100mm) construction with about half a metre ...
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floor insulation

I am looking for an under-floor-heat insulation. I live in a newer well insulated mobile home. I want to install electric floor heating cable on top of my existing sub-floor in the main living area ...
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2answers
48 views

Should I install radiant-barrier insulation in a walk-up attic roof in Pennsylvania?

I have a walk-up unfinished attic in an old ranch house in Pennsylvania, where we see summer temperatures over 100F and winter temperatures well below freezing. Because there is planking over the ...
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543 views

How can I protect this plumbing in an exterior wall from freezing?

We're converting an old bathroom addition in our house to be a utility/laundry room. The bathroom wasn't properly vented or sealed, so we are completely gutting the room to deal with mold and mouse ...
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Flat roof, polyurethane sprayed ceiling, holes in a air and vapour barrier

Ok guys, I really made a mess. I hired someone to spray my flat roof garage. I was going to put rockwool, but after researching those issues with flat roofs, i choose SPF closed cell. But it's not ...
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127 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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38 views

Installing insulation board in basement to control moisture

I just had a basement waterproofing job done and it is doing an awesome job relieving pressure and keeping the basement flood-free (we just had a very large amount of rain here in central PA and it ...
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Are there insulated covers available for attic fans?

I have an attic fan that leaks a lot of attic air down to the living area. Are there insulated covers that can be placed on the underside, living area side of the fan that can insulate from the attic? ...
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Is it going to be worth replacing bat insulation with rigid foam between bedroom and garage?

I have the classic problem of two bedrooms above a garage that are too hot in the summer. In the winter it can be cooler upstairs than the rest of the house but not as much as a temperature difference ...
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Laying underfloor heating on an uninsulated concrete slab

I have a 1970s house, which I am extending/refurbishing. This will include ripping out the existing, 40 year old central heating and moving the boiler location, etc. I was hoping to put in some ...