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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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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24 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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27 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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29 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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36 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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32 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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41 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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22 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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44 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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33 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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33 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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28 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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1answer
9 views

Gable vent information

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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17 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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2answers
71 views

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

I recently bought a black and decker 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. ...
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35 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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22 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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30 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
65 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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39 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
38 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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25 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
19 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
70 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
50 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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71 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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37 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
46 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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1answer
105 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
68 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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35 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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28 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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30 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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86 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
33 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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1answer
96 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 ...
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1answer
56 views

How can I increase the effectiveness of the A/C in a hot 2nd floor converted attic master suite?

Just bought a 1940's masonry construction house. House has a finished basement (cold as a meat locker), first floor (comfortable) and 2nd floor (too hot). The 2nd floor is an attic that has been ...
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76 views

What's the right approach for insulating the slab & footings underneath a masonry fireplace/heater?

The fireplace will be located in the middle of the concrete slab (away from the foundation stem walls) so it will have its own footing. My impression is that footings should rest on soil & gravel ...
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80 views

How do I protect and insulate a ceiling built against the roof?

My upper floor used to be a large attic. Sometime in the past the entire space was converted to living space: 2 bedrooms, 2 finished closets, and two unfinished storage "closets". Much of the ...
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38 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 ...
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1answer
49 views

Attic ventilation, do I have enough?

I currently have blown-in insulation, that reaches the top of the attic floor. I was told by several insulation companies that I need a R value of at least 49, meaning, I need to add a good 12-18" ...
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45 views

Garage Wall Question- Insulation and vapour barrier?

We live in Vancouver, BC, Canada. We are redoing the wall that separates our house from the garage. The wall is built with 2 by 6's and has been insulated with Roxul R20 thermal batt insulation. On ...
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84 views

will anyone stop laughing n thinking im crazy long enough to see theres a major problem(s) in my house? [closed]

As the title suggests, i have many issues in the home i purchased two years ago. And although, couuuntless hours attempting to unravel the mystery, and thhhhousands of dollars to fix the problems i ...
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1answer
43 views

Interior cement walls

I want my interior walls to be cement. Can insulation Foamular 150 rigid foam be added to the cement wall on the exterior side with siding on top of it.
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52 views

Best way to cover external XPS insulation

My house has a basement, and on the outside, there's a layer of XPS foam insulation on the outside of the basement wall, up to the grade. For most of the house, the sod goes right up to the house, ...
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31 views

Adding insulation to exterior walls in wood frame house

My house is a wood frame, pier and beam, and built in 1885. It uses balloon framing (that is, bigger boards at wider spaces, mostly 4x4s at 24" spacing). Inside walls are drywall over 1/2 inch tongue ...
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69 views

Do basement walls with metal framing and foam insulation require fireblocking and draftstopping?

Question: Do non-load bearing basement walls with metals framing and foam insulation (such as extruded polystyrene) in a single-family home require fireblocking and draftstopping? If so, what is the ...
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28 views

Replace portion of slab for radiant heat

Our 1600 SF basement has a slab floor with no insulation underneath. I'm redoing the bathroom (roughly 100 SF, with 7' along the foundation wall) and would love to put in radiant floor heating, but I ...
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56 views

Can I remove HVAC pipes after exposing the ceiling?

I recently removed the drywall ceiling from my basement and have two related questions about removing the HVAC ducts/pipes. Pictures attached here: http://imgur.com/a/qep4w 1. Is it OK to remove the ...
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56 views

What is the Source of the Approximate “R Value” Chart?

There is a Chart labeled Approximate "R Value" of Walls, Windows, Ceiling & Floor in one of the responses to the question How can I measure the r-value of a wall? What is the source of this table? ...