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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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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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What insulation can be used between electrical cabin and heater?

Good day, I work in a paper factory and we have a heater directly behind an electrical cabin. The positions of the two must remain the same. The heater heats plastic packaging to 160 degrees celcius ...
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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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Help with insulating rim joist in crawlspace

I'm in the process of insulating the rim joist in our crawlspace with foam board and spray foam to airseal but I've run into a section of the crawl I'm not 100% sure on how to seal properly. On the ...
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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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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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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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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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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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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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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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To vent an attic or not to vent an attic?

1976 Garrison Colonial located in the Northeast. Cold, snowy winters, hot & humid summers. The current attic doesn't have soffit vents and, b/c of a double layer of roofing, there isn't a ridge ...
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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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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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Sand under a Liner

Can I use sand under my fire pit liner? Attached Photo. What gauge steel should I use for the liner?
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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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How should I insulate my renovated bathroom walls?

I am currently in the process of renovating my bathroom and a portion of the walls in the bathroom are exterior. My house is an older home (1950s) and with the drywall removed you can see the black ...
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Insulation barn second floor

i have a two story barn like building that we bought from home depot and built on our property. I am living in the second story. it is not finished. what is the quickest and cheapest way to insulate
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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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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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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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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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Should I seal the heel gap between my trusses with fiberglass insulation?

I have a 35'X35' shed on a concrete slab with Steel exterior and roof on 6" walls. I am preparing to blow insulation into the rafters. There is a gap from the top of the wall to the beginning of the ...
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1answer
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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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Floor insulation & vapor barrier for an (sometimes) climate controlled shed sauna

I have an existing 10'x12' wood shed on my property that I want to convert to have a sauna, changing room and small shower inside. Climate wise I'm in the Pocono mountains of PA. The shed is built on ...
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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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dangers of putting both mineral wall and rigid foam insulation back to back

I am thinking of putting in thick, class A fire-rated polyiso insulation in my walls and ceiling instead of drywall. As even the thickest insulation will not completely fill the cavities, are there ...
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Basement insulation question

We have a split level home, with the basement being about 3.5 feet below grade, so there is a 3.5 ft stud wall aound the perimeter of the house and a ledge, then the above grade wall. We has some ...
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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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Basic insulated plasterboard vs standard plasterboard

We've taken walls back to brick. We are considering insulated plasterboard for external facing walls. Space is tight, so D&D'ing 22mm gyproc thermaline basic seems like the best option. Its ...
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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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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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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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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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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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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 ...