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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20 views

Vapor barrier plastic sheathing on wrong side of wall?

I recently torn down some drywall in my garage and noticed the plastic sheathing was on the wall on the garage side (other side of the wall is the family room), when I thought the sheathing should be ...
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Does the inside of a register boot need insulation?

I am talking about the inside of the register boots I have installed three new register boots, all of which had one inch of fiberglass insulation on the sides and top of the inside. Sadly though, the ...
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Sequence of Insulation (attic) and mud/taping

My question is about what is typical / expected on new construction. I have done a lot of remodels (over a dozen) in my life but this is my first 100%, new construction. Contractor is insisting we ...
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31 views

Insulating behind tar paper?

I have a home built in 1959 in Southern California with stucco exterior. I’m removing the drywall to do a major renovation and bring my wiring up to code. I noticed there is no insulation and just ...
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37 views

Preparing crawl space for storage

I have a large crawl space under my first floor that I can access from my basement. The ceiling of the crawlspace is insulated with fiberglass (my library/den is above it on the first floor). The ...
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Repairing Foil Faced Insulation

I removed some wood paneling which was glued to some foil lined insulation. In the process of removing it, some of the foil facing tore off. What’s the right material to replace this with? If it’s ...
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61 views

Okay to cover attic joists with plywood?

I have long scraps of plywood (1/2 in and 3/4” thick) left over from a recent renovation and since they are my retirement plan, due to price paid,I don’t want to toss them and don't really have a good ...
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1920's Home Attic Insulation Options for warmer summer months (SF Bay Area)

I'm currently trying to install a whole house fan in our 1000sf 1920s home in Oakland, CA. The weather is temperate and Oakland gets 3-4 weeks a year of heat that's 80deg-100deg. With our old house, ...
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2x8 insulation in a 2x6 ceiling?

My garage has a vaulted ceiling on 2x6 joists. The main roof of the building is a bit above it and the vaulted ceiling is not covered with any sheeting. I could feasibly put 2x8 batts of insulation in ...
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72 views

Adding “floor” to unfinished attic with blown-in insulation

I'm in the process of converting our attic into a useable storage space. We have no basement and a small garage so it'll have to be our main storage area, so I'm hoping to make it user-friendly and as ...
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Does effective insulation of concreate block contribute more to energy efficiency in hot weather or cold weather [closed]

I am building a grout filled CMU house in the Ozarks. I have limited funds at this point and so I would like to focus my budget on thermal control where it will be needed most (i.e. heating / cooling)....
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51 views

housewrap without removing siding

I'm adding an ADU in an old shop building that is sided with quarter-sawn tongue and groove siding. I really would prefer not to remove the siding, but I would like to seal the gaps between the T&...
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Replacing the paper on paper faced insulation

I recovered a bunch of unfaced insulation from various places in a building and would like to re-use them, but one would traditionally use paper faced insulation for many of the situations where I am ...
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How to ensure electrical wire is safe from nails when using spray foam insulation

So I had closed foam insulation installed after my electrical work is complete and as an after thought, i started questioning how is it that the wire is safe/protected from nails and screws. When ...
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Insulation around the pipe outside of a kitchen exhaust

Context I have a kitchen exhaust which works well enough, this question is about insulation. Last winter was quite a cold one for where I live, and I felt a nice fall of cold air coming from there. I ...
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62 views

Insulation worth the cost?

I have a detached garage with no heat/air currently. It’s all brick construction. I will be building a standard stick frame for approximately 1/4 of the overall wall surface area (less the garage door)...
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How can I insulate a duct running through an unconditioned kneewall space?

Unfortunately, I have to run an 8 inch HVAC duct through an unconditioned kneewall attic in southern Ontario (climate zone 6). I am trying to decide between two options: Encapsulate duct with spray ...
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What kind of insulation is this?

Trying to identify this type of insulation and maybe some alternatives I can use to replace it with. It looks like foam to me. House was built in 1950s or so:
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How are attached buildings air sealed together?

I am a condo owner in a building that is structurally independent but abuts directly against another building. As a result the 2 buildings move somewhat as they settle or have changes in temperature. ...
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Is it worth insulating the roof of a detatched, unfinished garage, but not the walls?

My detached, unfinished garage is pretty sucky because the walls are only 6' high. Based on quick and dirty math, it'd make more sense to tear it down and start over than to try and finish it, but I ...
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55 views

A creative Eco-friendly Underlayment for a metal roof? [closed]

I am building an octagonal cabin with a 200 sq ft metal roof (Grandrib 3) at a 30 degree pitch; the roof will sit on wooden strapping and will eventually have insulation below it contained by a ...
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77 views

Can I remove accumulated sawdust from fiberglass insulation?

I have an unfinished basement with framed and insulated (the yellow fiberglass stuff) walls, but no sheet rock. Over time there has been a lot of accumulation of sawdust on the insulation as the area ...
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Calculating U Value of a room

I am converting a garage to a usable room and am researching different options when it comes to insulation. I know more insulation is better, however there is a point where adding more insulation ...
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How to improve cooling in a room/Cool a concrete wall?

Im on a 2nd floor room, it has big front windows and a small one on the side, I am using my computer/full setup on the corner of the room, where beside me is the window wall, but since im in the ...
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What to do about a solid wall?

A little over a year ago I had a first floor extension added to my house (London, UK), and I have since discovered a number of problems - for example, no insulation at all in the loft. I am now having ...
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72 views

Worth it to replace a freezer gasket? [closed]

Our freezer gasket has gotten compressed, and is leaking cold air. My options are to buy a new refrigerator, buy a replacement gasket and replace it myself, or just live with it. I'd like to avoid ...
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74 views

Mystery surface behind drwall

Was attempting to install an in wall power kit to hide the wires from my mounted TV and seem to have hit something behind the drywall. Not sure if it's some sort of rigid insulation, but I'm hesitant ...
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I'm using 2" EPS below grade insulation for radiant floor heating, Do I need a poly vapor barrier on top?

In addition to 2" of EPS do I need a poly in a radiant floor heating system
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51 views

Insulating inside walls of old house [closed]

We have a 120+ year old farmhouse in South Central Illinois. We removed all interior plaster and lath and want to insulate the walls. What is best way to insulate? I have been researching for a week ...
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49 views

Is insulation or damp proof barrier a requirement for walls in wood sheds?

I want to cover the interior walls of a shiplap wooden shed with plywood to hang tools and put up shelves on a flat wall. Do I need to insulate the gap between the plywood and the wooden planks of the ...
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94 views

Do I need to leave space between insulation and the roof deck with a cathedral ceiling?

I'm finishing a 14x14 shed that has 2x6 rafters in Austin TX, and I want a cathedral ceiling. The shed builder says they usually recommend filling the cavity with R-19 fiberglass insulation, leaving ...
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119 views

Should I insulate my pizza oven between the firebrick base and concrete?

I am building a pizza oven for my garden. The 'table' will be standard red brick and concrete slabs to form the work top. On top of the work top, I was intending to lay a layer of firebrick, and place ...
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112 views

R-value for insulating a vaulted ceiling?

We're building a finished shed in Austin, TX with drywall and HVAC. It will also have several huge double-paned windows. I think we'll be going with R-13 for the walls. It's generally suggested to use ...
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25 views

Insulation foam

Plumber suggested using foam in this bay (with a water supply for a standing tub filler) because it was better than batts of insulation in stopping cold air movement, hence preventing freezing. I ...
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44 views

How can I add more insulation to my finished attic walls without trapping moisture

I have a finished attic that has a kneewall insulated with fiberglass batts, insulation facing in. The batts fill the depth of the wall cavity completely to the end of the stud, there's no more room ...
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64 views

How to add insulation to ducts in hot uninsulated attic?

I have central air with ducts running through the hot, uninsulated attic (there is blown-in insulation between the joists to insulate the rooms below). Fortunately it's only about 25 feet of ductwork, ...
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Is it ok to boost finished attic kneewall insulation with rigid foam board over the batts?

Have a finished attic with fiberglass batts (poorly) installed between the kneewall studs--the batts are faced and the facing is on the inside. I want to put an airtight, taped layer of rigid ...
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62 views

How can I find all the air leaks and insulation gaps in my finished attic?

I have a finished attic which gets hot very quickly, requiring running the central AC excessively and due to the imbalance, the downstairs tends to get too cold while the finished attic is still too ...
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Metal shed/roof/ with window air conditioner/insulation foam board

I have an un insulated metal shed. Both walls and roof are metal. I bought insulation foam board for the ceiling that has the shiny foil on one side. I have a air conditioner mounted in the wall ...
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119 views

Where to place the vapor barrier in a sunroom floor

I'm looking to insulate the floor of a sun room. The room is a converted screen porch (i.e. there is free airflow under the floor). My plan was to crawl underneath, staple vapor barrier to the bottom ...
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Low profile options for insulating cathedral ceiling

I'm looking to convert an existing screened room into a sun room. Part of that process will be insulating the cathedral ceiling. Unfortunately I don't have a lot of space. Ideally I'd like to get R39 ...
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How can I get the insulation batts back up above the finished attic ceiling?

I have a finished attic. The finished room has drywall screwed directly to the roof rafters. There were insulation batts installed between rafters initially, but it's a steep slope and most of them ...
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Kenmore 465 Stove / Range with range missing a pipe and insulation exposed?

I have a Kenmore stove that's probably from either 2006 or the 90s some time; and we recently replaced all the drip pans in it; I don't know why or who, but one family members pulled a pipe out of the ...
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How to properly insulate PVC water pipes outside?

I live in Houston, and I'm trying to re-insulate my external pipes, which are a mix of PVC pipes and fittings and brass valves. Most of my fellow Houstonians use foam polyethylene insulation and duct ...
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32 views

Best way to insulate supply duct with minimal clearance

I wanted to wrap the supply side ductwork, but the return is mounted so close to it, in some spots barely 3/4 of an inch of space between them. What is the best way to insulate in this case? Supplies ...
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1880 Home with Ballon Framing - Roof Soffit Question

I have a 1880 house with balloon framing. On the 3rd top floor, the roof line extends beyond the top plates and there's a air gap at the end...I can right into my rain gutters from the inside and have ...
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How are vapor barriers, moisture barriers, and house wrap different?

I've read many discussions here and elsewhere talking about these three things with regard to insulation, energy efficiency, and siding installation. What are the differences and where are each used?
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Would insulating a basement wall with XPS and reflective insulation create a moisture problem?

I'm in Massachusetts (ICC 2015 w/ mods) and want to finish my basement walls. I'm thinking about using a combination of 2" XPS, 1x2s horizontal 24" OC, Reflectix (double reflective ...
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How could I insulate a thin hot roof and bring it to current Southern CA code?

So we started an exterior remodel today, and found that our roof construction is way more mickey mouse than I thought it was. Our house has vaulted 2nd floor ceilings through most of the 2nd floor ...
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Using Quietrock drywall AND Rockwool Sound Insulation?

How much additional noise reduction can I get by combining Rockwool sound insulation with QuietRock drywall? Or does one render the other moot? I'm looking to add some noise reduction to an unfinished ...

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