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.

174 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
5
votes
2answers
412 views

Should I cut air space in my basement foam board insulation?

I intend to finish a part of my basement following this guideline from Fine Homebuilding and Building Science. In this configuration, the foam board completely contacts the concrete. My conern is that ...
4
votes
3answers
23k views

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 ...
3
votes
1answer
947 views

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 ...
3
votes
1answer
377 views

How would I install hydronic floor heat on top of a rigid foam insulated basement floor?

I intend to finish a part of my basement following this guideline from Fine Homebuilding and Building Science. There are two options I could come up with for installing hydronic radiant heat ...
3
votes
1answer
2k views

Getting R38 in roof with 2x8 rafters

I was planning to use foil faced 2" polyiso plus an air gap, plus 5 1/2 rock wool, to get 13+3+23, or r39. But this is all between the rafters below the roof deck, and the polyiso is impermeable. If ...
2
votes
1answer
94 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 ...
2
votes
2answers
143 views

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 ...
2
votes
1answer
406 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 ...
2
votes
0answers
33 views

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 ...
2
votes
0answers
81 views

garage vapor barrier

I am converting my garage into a wood shop and have insulated my walls with faced R13 insulation.The ceilings have faced R13 installed with R30 unfaced additional to the R13. Do I need to install ...
2
votes
0answers
48 views

Insulating slab and vinyl siding

I have a really cold corner of my house in a duplex. Here are some shots from an infrared camera. I hope we can get this fixed without tearing down the siding or ripping out freshly installed kitchen ...
2
votes
0answers
50 views

Installing Radiant Stiff Board Insulation

I'm in the process of renovating a bedroom on the second floor and I have a few boards of silverboard (a Polyisocyanurate Foam Board Insulation) lying around and would like to use. The exterior wall ...
2
votes
0answers
104 views

Transitioning between foam insulation and foam board in basement

In our unfinished basement we had floor to ceiling blanket/roll insulation from the builder. Now that we are finishing it, in order to meet R20, we are removing the bulky blanket insulation and going ...
2
votes
0answers
302 views

Insulating cantilever overhang - do I have mortar/stone between joists?

My house was built in 1928, its an old Milwaukee bungalow. I have a small cantilever overhang in the front of my house. That area gets pretty cold in the winter, so I wanted to investigate insulating ...
2
votes
2answers
447 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 ...
2
votes
0answers
760 views

Will insulating rim joist without sill plate lead to moister issues?

The house was built in 1930 and besides some bays stuffed with fiberglass the basement is uninsulated and unfinished. After two MN winters in the house I've managed to fill the larger holes but have ...
2
votes
0answers
217 views

What could cause moisture on my bonus room floor?

Last week during a cold snap with high winds. I discovered moisture along the floor on one side of my bonus room, above the attached garage. Their was enough moisture that the baseboard molding ...
2
votes
0answers
864 views

How should I seal and insulate a crawlspace to mitigate radon and allow for storage in the space?

Background: I recently bought a house built in 1996. It has a 1480sq ft (approx) living area, which is the same as the crawl space size. The location is in the Kansas City metro area. The yard is ...
2
votes
2answers
1k views

How can install rafter baffle venting without removing drywall?

I have a finished attic, that needs to be updated. The pitched sides of the roof are sheetrocked & insulated, the ceiling is a suspended ceiling (will be sheetrocked) and the low knee walls are ...
2
votes
0answers
578 views

How can I insulate and elevate an A/C line set on a flat rubber roof?

The Scenario An apartment building with a flat black rubber roof. The A/C condenser is on a platform on the roof with an air handler inside the unit. The line set runs across the roof for about 20 ...
2
votes
0answers
2k views

How can I insulate brick exterior walls in a 100 year old house with wood beams in brick pocket floor supports

My sister has a 100 year old or older home over a wet and damp crawl space on an island which has high tide and rain water flooding of streets an crawl spaces. A sump pump runs all the time. The home ...
2
votes
2answers
44 views

Basement moisture on foundation issues

After taking all sheet-rock down I noticed that all walls (cement block) siting under ground are moist. Some of them even ate through footers. After farther look at the house I found out that their is ...
1
vote
0answers
44 views

Great Stuff Foam sealed gas pipe, fire safety

So I have a pipe penetration problem at the gas pipe. I hired a contractor and he decided to use great stuff to seal the gap. Would it be a fire safety problem? Thanks,
1
vote
0answers
28 views

Air sealing vent baffles in cathedral ceiling

I am reroofing my house. I am taking the opportunity to pull up the decking above the cathedral ceiling and adding air baffles to help cool the roof and reduce ice dams. In order to accomplish this, ...
1
vote
0answers
100 views

Is this cloth jacket surrounding my electrical asbestos?

Checked to see what was going on behind the electrical socket, and discovered this fibrous wire insulation. Also, I think who ever installed this 3 prong outlet in the first place did so illegally ...
1
vote
1answer
38 views

Improve existing roof insulation from the inside

We have a pitched roof (1971 house, The Netherlands) which consists of (outside to inside): Tiles 2cm PUR insulation 2cm wood We asked a few companies for quotations to improve the insulation (...
1
vote
0answers
78 views

The new AC doesn't cool the house down like old unit, what can be the problem?

I had to replace my old HVAC because it was old and had a freon leak. The new unit doesn't cool down the house like the old system. The ac runs all day and it takes hours to get down to 72 degrees and ...
1
vote
2answers
70 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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
2answers
81 views

Insulating basement concrete walls - anything missing?

Live in Zone 5b, going to shoot for 2" of XPS DOW foam board. Planning on gluing it to the concrete wall with foam board glue and bracing it while it cures. It will run to either the top edge of ...
1
vote
0answers
24 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 ...
1
vote
0answers
32 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 ...
1
vote
1answer
132 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 ...
1
vote
3answers
79 views

Redoing insulation in the basement of the home I recently purchased

I recently purchased a home and have begun to do renovations on the basement. I am starting to look at insulation and so I have been researching what the best way would be to do that. The problem I am ...
1
vote
2answers
202 views

Fireblocking a balloon framed house lead to rot in the walls?

Conditions: Balloon framed construction, house built in 1930, Southern Connecticut region Does installing a fire-stop or Fireblocking where the sill plate and rim joist meet, block airflow and ...
1
vote
1answer
67 views

Drilling into cinder block foundation

My house has a block foundation and water issues, I have a company coming soon to install a perimeter drainage system w/ sump pump and he said he's going to install a mill sheet vapor barrier about 4" ...
1
vote
0answers
43 views

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 -...
1
vote
1answer
51 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 ...
1
vote
1answer
54 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 ...
1
vote
1answer
67 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 ...
1
vote
2answers
54 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 ...
1
vote
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. ...
1
vote
0answers
83 views

Should XPS insulation not touch basement floor?

When putting up XPS insulation in a basement, prior to framing, is there a reason the insulation shouldn't go all the way to the floor? In this guide, they show the XPS resting on top of 2x4s (lying ...
1
vote
0answers
214 views

my garage has soffit and ridge vents and I want to insulate it (southern NH)

like the thread title says: I'm located in Southern NH, allegedly we have 4 seasons although I'm having my doubts about the veracity of that (loonnng winter) I have an attached 2 car garage with a ...
1
vote
2answers
101 views

how to insulate attic that contains high-efficiency furnace?

We have an older home with a separate high efficiency furnace for the second floor. It sits on a floored area of the attic. We have virtually no insulation and I've gotten various recommendations ...
1
vote
0answers
25 views

Insulating the space under our kitchen

We bought a house about 6 months ago that has a kitchen addition (house is about 110 years old-not sure about addition). Over the winter we have learned that the space underneath must not be insulated ...
1
vote
0answers
128 views

Looking for thin internal wall insulation for solid brick wall

My solid brick 1800s house in south Britain, it is semi detached. I am considering internal insulating some of the walls on the detached size to reduce heat loss a little. The idea would be to simply ...
1
vote
0answers
61 views

What is this under the steel front door?

I assume this is a type of insulation. It tore off a bit when I removed the trim board while redoing floors. Before I put back the trim should I repair the insulation? Is there a product that can be ...
1
vote
2answers
631 views

Plywood over rigid foam over concrete: will I have moisture issues?

Short version: If I install 3" of rigid foam over a poured concrete foundation wall that has been sealed with Xypex, will I have any moisture issues if I install plywood directly over the rigid? ...