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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415 views

Install plastic between drywall ceilings and rafters?

We are building a new house and are getting ready to install the drywall on the ceilings. We have installed a 6 mil plastic barrier on the underside of the rafters to act as an air & moisture ...
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4answers
146 views

How to cover exposed attic wall insulation

I have a small walk (crouch)-in attic from the closet of one of my upstairs bedrooms. It has insulation on the walls that form the bedroom closet/wall. Given how small the attic is, whenever I go in ...
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2answers
120 views

Insulating between boiler room and bathroom

Part of my bathroom is directly above the boiler room. The boiler room is only accessible via an external door and is well ventilated with wall and door vents, so I consider it more like an outhouse ...
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3answers
61 views

How do I check my upstairs bedroom for insulation in the ceiling?

I have a bungalow home in Michigan that has plaster ceiling. How do I check if the ceiling is insulated between ceiling and roof with no access point? The upstairs room was meant to be an attic but ...
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0answers
94 views

Insulation and Vapor/Moisture concerns with a wood ceiling.

I have already removed the drywall in the ceiling so the rafters and bat insulation is currently visible. I plan to be adding plywood to the ceiling and then installing 1x6 boards on top of the ...
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0answers
26 views

Proper method to seal a heated crawl space

I have a heated crawlspace with a dirt floor. There are no vents, it is fully connected to the house, and currently has a pool liner and vapour barrier stretched over it, but it is not sealed. There ...
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24 views

Insulating attic - vapour barrier question

My girlfriend has her parents 61-year-old home in St. John's NL and it has an attic with poor ventilation and unfastened R-12 kraft-faced (and facing up) fibreglass laying on the original drywall. I ...
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2answers
96 views

Will batt insulation ignite if it is laying against my steam pipes?

I have steam pipes behind a wall that I loosely packed R30 batt insulation against. Is there a possibility that the insulation will ignite?
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1answer
51 views

How should I insulate a wall I opened up?

I am remodeling a bathroom and adjacent room and walls that are on the exterior side of the house are now open. I am trying to figure out what I should do to help insulate the walls better. The house ...
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2answers
45 views

Insulating the roof rafters

I have a heater/AC UNIT installed in my attic and in winter the heat from the unit melts the snow turning into ice and creates a nitemareso I want to put insulation in the rafter to insulate the roof ...
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1answer
76 views

Which is more effective in a 3.5“ stud bay--”R13“ or ”R19" batt insulation?

I have extra R19 insulation batts (designed for a 2x6 bay)--should I use them in a 3.5" stud cavity, or does compressing them that much make them less effective than R13 batts in the same space?
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2answers
44 views

South Florida roof softit roof ventilation and of insulation batts

I live in south Florida and am insulating the roof by placing batts between the rafters. I'm not sure if placing the batts up against the edge where the beams and walls meet is ok or not. The rafters ...
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2answers
38 views

Correct Glue for Foam Outsulation?

My house is masonry block about halfway up and then wood siding with top. Two months ago I had outsulation installed. It’s made up of 2x4 feet foam panels that are 2 inches thick. These are covered ...
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1answer
44 views

Can fiberglass insulation cause leaks?

I've recently bought a 100 year old wood frame house from a DiY guy who took decent care of the place. He didn't put any insulation in the attic though and my home inspector said insulation is a great ...
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0answers
60 views

Monolithic frost proof shallow foundation, advice on the smaller details?

I'm building a 16x24 shed/garage. I have done most of the site work and I have a concrete guy starting tomorrow on the forms in preparation for a pour on Friday. He's done insulated slabs, he has 30 ...
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2answers
326 views

What is the downside to installing faced fiberglass insulation in a dirt floor crawlspace vs non-faced?

I have a vapor barrier on the dirt floor already. The insulation will go in the floor joists above, paper side down.
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0answers
232 views

Is it worth spending extra on R14 or R20 fiberglass insulation

I've put in 1" Type 1 polystyrene (estimated at R3.75) around the exterior walls and I'm deciding which insulation to use in the framing. The R12 works out to $.38 p/sqft The R14 works out to $.54 ...
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1answer
152 views

What are my options to fix cold and drafty floors over a vented crawl space?

I have a 1950s bungalow that sits on a crawl space. The crawl space is vented and has moisture problems (which I should/will fix, but that's not the main point of this question). R19 insulation is ...
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1answer
41 views

Interested in home will mold problem . Can mold be in carpeting? Howe do i remove

Interested in purchasing a home that has been empty for several years. Has a little mold on upstairs walls able to take care of that. One room has ceiling repairs with mold. Can the mold go up into ...
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2answers
105 views

Is it better to fill up the space between rafters with insulation, or put baffles on top and add soffit vents? (inland Los Angeles, cathedral ceiling)

I have 5.25" tall rafters, about 30" on center, with roof planks directly on top of them. I would like to keep the rafters visible, but add insulation between them. So I only have a few inches to work ...
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2answers
241 views

What product will insulate an exterior PVC pipe coming out of the ground with a faucet on it?

We want to insulate from freezing an exterior 24" tall PVC pipe coming out of the ground that has a faucet on it ~ a heated product is not plausible in our situation. Are there other products that ...
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1answer
63 views

Is it okay to 'sandwich' rigid foam insulation between old and new sheet siding?

I am putting new LP Smart Siding (4'x 8' and 3//8" thick) onto my house, which will overlay old T1-11 siding. I would like to put R-MAX 1/2" rigid foam insulation under the new siding. Is this okay? ...
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1answer
165 views

How to add insulation to a hollow core exterior door?

During some renovations to my house and I removed some wood-paneling and uncovered an exterior door. The door faces west, so it gets the late afternoon sun and in Phoenix, the door gets hot. ...
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2answers
71 views

How do I insulate a crawl space?

I have approx 500 sq. ft. of crawl space (under addition to original home). 15 x 35 ft. with 2 x 10 joist & concrete flooring ( no dirt ). Ventilated to outside is provided by 3 windows. The ...
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1answer
78 views

Foam insulation in interior walls

If I use foam insulation on the outside (2") and in the 2 x 6 walls (from 4 - 5"), do I need to fill in the leftover space on the inside with fiberglass or Roxul, or just put the vapor barrier over it ...
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1answer
73 views

What type of insulation should I use in a knee wall?

We have an unfinished bonus room over the garage on the second floor. A normal door goes to it and same height as rest of the 2nd floors and full sized windows and the house was zoned for the ...
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3answers
38 views

Should I add another gable vent to my attic?

I have a long house with a 3 sq foot gable vent on the east end. I have two 6 ft long roof vents in the middle and I want to know if I should install another gable vent at the west end to increase ...
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0answers
83 views

Faced or unfaced insulation in floor above unconditioned crawlspace?

I'm insulating my floor. I live in a dry climate with cold winters and R-30 is recommended. I am insulating from below so cannot staple the facing paper. What is typical for this application? ...
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3answers
295 views

Insulating/preventing heat transfer on non-IC rated recessed lights

I recently bought a thermal leak detector and discovered that my recessed lights upstairs are leaking a lot of heat and causing the upstairs to be uncomfortable and hard to cool. This is the brand ...
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0answers
117 views

Rockwool / Mineral wool for my crawlspace?

Should I spend extra money and insulate my crawlspace with rockwool? I like that it is easy to install, that it stays in place and looks clean up above. It does cost more per sqft. I have a 1980's ...
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0answers
29 views

Saturated insulation Under Mobile Home

I live in a mobile home on piers, in Florida.There was a broken water pipe to the outside faucet that I have fixed, but, during the leak all the insulation under my mobile got saturated. How can I ...
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1answer
58 views

Replace batt insulation or leave it?

Currently, the exterior walls have batt insulation. It has the paper face on one side. A few months ago, I removed a window due to watered down drywall caused by the window. At the time, I didn't ...
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3answers
106 views

Would enveloping an attic in insulation cause any problems?

My attic currently has batt insulation between the joists, and a second layer of batt insulation on top of that. In the summer, the second floor is quite a bit warmer than the first floor. I'm ...
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1answer
75 views

Attic Insulation (floor or ceiling?)

Is it better to insulate in between the slanted ceiling joist Or floor joists in the attic if you have a whole house attic fan? Or both? In long: Out of budget reasons I was thinking of leaving ...
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1answer
77 views

Can a recessed IC-rated housing be in contact with nonmetallic sheathed cable?

I have recently installed 8 of these 5 inch insulation contact rated remodler housings in my kitchen. Two of the holes I made were close to an existing nonmetallic sheathed cable (NM) running through ...
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29 views

how install insulation to pitched ceiling with no measurable space between ceilng and roof

how can insulation be applied to pitched ceiling covered with dry wall so thin when new roof was installed nails came through the ceiling. once sprayed insulation is sprayed on can it be covered with ...
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1answer
22 views

Concerned about the outcome of insulation fibers

I was working in an attic ,an exhaust fan was turned on I immiedetly breathed and was choked with the insulation to the point I couldn't breath ,I now feel it in my lungs as uncomfortable ,any idea if ...
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1answer
257 views

knee wall no venting possible

My master bedroom is above my garage. There is one part of the bedroom that has a cathedral ceiling with knee walls on both sides. There is no attic above this area because the drywall goes up along ...
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3answers
58 views

Is the material encasing a steam heating system asbestos? How can i determine this?

I'm looking to purchase a home. It has a steam heat boiler system, wrapped in a white material that seems "old". Is it possibly asbestos? How do I test to see?
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1answer
102 views

Causes of condensation in basement wall

First time home owner of 1 year old house in Southern Ontario. South facing basement wall (50% above grade) has condensation forming between polyethylene barrier and pink batt insulation. What ...
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1answer
103 views

Can you paint Dow THERMAX WHITE FINISH INSULATION?

Can you paint the insulation boards after installing them? This would be for an attic interior installation. Then could I skip the dry wall? How good would it look compared to drywall?
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1answer
180 views

Should I insulate my attic with a hot or cold roof?

I'm turning my 3rd floor attic into a usable space. It's a hip roof, 25' x 23', with one dormer. We just had new asphalt singles put on it and it was about 12 foot of ridge vent on the dormer / ...
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2answers
215 views

Is it dangerous to use polyisocyanurate without covering it with drywall?

I would like to glue sheets of polyisocyanurate to one basement wall which is very cold in the winter. Due to plumbing and electrical panels, I will not be able to cover the polyiso with drywall. Are ...
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1answer
661 views

What type of insulation should I use if my in-wall oven is heating the surrounding cabinets?

We have an in-wall oven that is not properly insulated. It heats up the surrounding cabinet. The oven itself has internal insulation in good condition, but it is not strong enough to keep heat ...
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0answers
77 views

Super-Insulating a Crawlspace

I am getting ready to have a contractor insulate my crawlspace. The exterior facing walls of my crawlspace are about 2" above grade, with the remaining 2 ft 6 in - 2 ft 10 in below grade. One of the ...
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0answers
50 views

How should I insulate my bathroom wall?

I just gutted my bathroom. I want to replace the insulation in the walls. Right now there is fiberglass insulation with a plastic vapor barrier. Behind that is a old cardboard like material that they ...
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0answers
53 views

How to insulate existing roof space

I have an old (1950's), victorian esque, 2-story, uninsulated, lath and plaster house that I would like to add some insulation in order to at least curb the hot/cold of the Inland Empire here in ...
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1answer
272 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 ...
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1answer
101 views

How are thermal (fire) barriers installed over foam insulation in a crawlspace?

I will soon be sealing my crawlspace with plastic sheeting across the floor and up the concrete walls. I plan on then adding rigid foam insulation. My reading of the Residential Code is that I will ...
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2answers
784 views

Insulating a post and beam construction roof/cathedral ceiling

My house (built 1972) has a cathedral ceiling with post-and-beam construction in the main room. The ceiling temperature can get as high as 90F, or even greater on a very hot sunny summer day, as ...