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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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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bathroom insulation issue

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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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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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
20 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
22 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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27 views

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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2answers
27 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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3answers
54 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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19 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
33 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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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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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
27 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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1answer
45 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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16 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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1answer
54 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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1answer
27 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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41 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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48 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? ...
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2answers
59 views

How should I insulate a cantilevered bay with plumbing, ducting, and electrical?

If you were faced with the following cantilevered bay, how would you go about insulating it? I can seal most of the wood air dams between joists with Great Stuff, but as you can see, there are two ...
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3answers
33 views

Insulation type to use on a hinged metal attic door

In this question, I asked about the best type of insulation to use on a hinged metal attic door, when one is also concerned about heat entering around the edges of the door when closed. The answer I ...
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1answer
82 views

Finishing Attic Floor (Joists Blocking / Insulation)

I moved into a house built in the 1920's several months ago that has a finished attic where the former owner's two teenage boys were living. I want to go from the old ratty carpeting to nice floor ...
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1answer
40 views

What is the best type of insulation to use on a hinged metal attic door?

What is the best type of insulation to use on a hinged metal attic door (no integrated ladder)? Primarily concerned about heat entry through the door when closed. Also concerned about heat entry ...
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45 views

Will installing closed cell spray foam over ventilation for basement French drain significantly affect performance?

Question: Will installing closed cell spray foam over the ventilation for a basement French drain significantly affect the sump pump system's ability to remove water from the basement? Background: I ...
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1answer
115 views

Spray Foam Insulation Health Concerns - Alternative Spray Foam Products

I am looking to gather facts (although I am sure there will be a fair amount of opinions) about spray foam insulation and the health concerns associated with the install and everyday living. I mainly ...
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1answer
60 views

Kitchen remodel to studs, infilling a window, no insulation, no building wrap!

looking for some urgent feedback. My Husband and I are remodeling our kitchen. We're down to the studs, and two of the walls are exterior. The house is a 1920's bungalow. We're actually making our ...
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60 views

Cell Foam vs. Traditional Fiberglass Insulation for Party Wall

In an end-unit townhouse, cell foam is being used to insulate the three exterior walls. Would the gains from also using cell foam on the party wall be noticeable? Or would the cheaper alternative of ...
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41 views

Insulating the concrete columns

we are building a house with bricks and it has columns every 3 meters. Wall is going to be insulated with foam blocks and I am trying to figure out how to insulate the columns. Will putting a 2 - 3 mm ...
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2answers
52 views

Considerations for spray foam insulation with roof replacement possible in about 10 years

We have an old house in the Philadelphia area which we bought last year. This has a slate roof and we were told by our home inspector that we'd need to consider replacing it in 10 years. It is the ...
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1answer
51 views

What is the best way to board interior of a large shed?

I have a large shed/workshop which I want to board with OSB/Ply to make the interior more usable for hanging things from the walls and to just generally make it "nicer" inside. I'm not fussed about ...
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1answer
56 views

How should I insulate an interior wall between a warm humid bathroom and a cold bedroom?

We're redoing the master bath. I'm wondering if and how I should insulate the interior wall. Bedroom is kept at 50F. Bathroom will be warm (radiant floor) and humid even if we have and run vent fan. ...
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79 views

Insulating the wall

I want to start building my house and wanted to ask for tips on how to do the insulation on the walls. I heard from people how they are doing and here is how it looks from above: My questions are: ...
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49 views

Best practice to install corrugated iron/colorbond wall claddings

I am building a smallish house at the moment. The wall frames are erected & the roof trusses & sheetings installed: The house is at a stage where the wall claddings are to be installed. I ...
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3answers
81 views

What's a high R-value insulation material alternative to dimensional lumber

Years ago I read somewhere about a building material described like this : a composite/synthetic material (not wood) available in traditional dimensional lumber sizes (e.g. 2x4) rigid enough to have ...
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37 views

How can I locate the roof vent off my septic system?

I am working on insulating my attic. While up there, I was looking for the septic vent line coming through, but couldn't spot it. I went back outside....spotted the vent on the roof, made mental notes ...
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68 views

How can I air seal around a brick chimney with a metal flue liner?

We have a 1954 brick chimney that has a metal liner inside and is only used by the natural gas hot water tank. It's had fiberglass right up against if for guessing 20+ years. I'm air sealing the ...
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2answers
75 views

Can I insulate flat roof using this method?

I just wonder if I can insulate my flat roof in northern India by following steps as under: Apply a cover of Bitumen Cover it with polythene (for water proofing) Lay used cement bags on polythene ...
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57 views

Should I bother to flip basement ceiling insulation that's on backwards?

the rolled faced insulation on the ceiling of my unfinshed unheated basement is on backwards(vapor barrier facing down instead of up towards the 1st floor),1st floor is uncovered hardwood. Insulation ...
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2answers
74 views

Bathroom above the Garage

Is it advisable to build a bathroom above the garage? What kind of obstacles might we face if there is a bathroom above the garage in terms of piping, insulation, etc.?
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43 views

Is it possible to install soffits from inside of the attic?

Is it possible to install soffits on the inside? I requested a quote from someone to unblock or install more soffit vents and on the quote he wrote " more vents install by soffit". He made no ...
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1answer
60 views

Looking for Second Opinion on New Insulation in Attic

I had someone come take a look at the attic yesterday to do an assessment. He uses the sprayable foam insulation and said that he would spray the ceiling of the attic rather than the floor (and remove ...
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2answers
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Box in knob and tube wiring between ceiling and cellulose?

I know that code says no cellulose insulation with knob and tube wiring because of possible heat build up. I also know that evidence of it causing fires because of this is scarce and a few states ...
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54 views

How to insulate roof from heat (sunlight)

I'd like to insulate roof which is over my flat in 4 store building. MY flat is the last one and every summer is a killer for me as about for 1 month a year I have constant temperature of 30 Celsius. ...
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1answer
84 views

Can I insulate PEX pipe in a crawlspace with fiberglass insulation?

I have PEX pipe hung under the floor joists in my crawl space. I am inclined to cut fiberglass wall insulation R-14 into strips and run it under the pipe.That will encase it as the floors are well ...
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1answer
28 views

What is the correct Air Flow change per hour for my house?

I recently just got my house air sealed. Before air sealed the Building Air Standard (BAS) was 1.4 now it is 1.2. Based off a 1300 sq ft house. What should the BAS be? Is there a calculator to ...
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27 views

Can I add rigid foam to the cold side of a kneewall?

I have kneewalls and attic floor/1st floor ceiling that are insulated with R13 and then have plywood covering. The floor has plastic against the 1st floor ceiling "warm side". I'm considering adding ...
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How to re-insulate between roof and top floor?

The space between my roof and the ceiling of my 2nd (top-most) floor is barely enough for me to crawl in. The roof tapers down to either end of the house from that, making the outer reaches ...
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73 views

Should I install a plastic vapor barrier below the insulation between my ceiling and attic floor?

I'm redoing the insulation in my attic the floor/ceiling cavity and then the ceiling of the attic. I have 2 rolls of plastic that is 15 ft by 150 ft just sitting around -- I've had it for years. Is it ...
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2answers
88 views

Why is it so cold downstairs?

My house has a concrete slab foundation and the floor in the kitchen and living room is all tile. It is always freezing downstairs in the winter and I'm wondering if this is due to the floor or maybe ...