How To Install Fiberglass Insulation - This Old House

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Alex Schimeck: No acoustic sealant? Didn’t stuff the windows after that horrible foam job? Where in the world would this pass code? This looks like a nightmare.

Vegan Heart: Have my cathedral ceiling and walls all done in new addition in zone 6 iowa with Roxul Insulation R30 and Accuvent Baffles. Have my Certainteed Membrain. Does anyone know if it matters which is overlapped? Ceiling membrain behind wall membrain or wall membrain behind ceiling membrain? Does it matter if all is sealed anyways?

Kirby7601: 2:00 i see you pink panther. freaking pink panther

Gabriel Gonzales: Contruccion

Susan Aung: What kind of a tool are they using at 3.48-3.55? Is it a nail gun?

Adrian Rodriguez: the fiber glass causes cancer n creates dust that can have u have allergies . pink panther = pan 4 cake which = gay . ther mean electric shook like thunder for u gunna b shock when u find out u have cancer.

max fire: Wear a mask not gloves,you can bath after using the insulation

redmudpei: Wrap the electrical boxes during install(on exterior walls) with vapor barrier too

Charles Field: Its important to note that the plastic barrier is only correct in a cold climate. In a warm humid climate it would need to be on the exterior and in mixed warm/cold climates on the neither side.

Shlomo Cohen: Chad Carlberg HI, I bought an apartment that's made of concrete walls (10 cm blocks). there are no insulation inside or outside. What's the best way insulating it from inside?

Amon Gia: nice and tight

Mike ownerbuilder: When cutting fiberglass insulation around an electrical box, it should not be bunched up to the side as illustrated. It should be compressed (up to 2x for regular density and up to 1.5x for high density) and squeezed behind the box in order to achieve the max R value. If the space behind the box is less than 1/2 of the thickness of the batt, then trim some of the batt away by making it thinner. Splitting the fiberglass around a wire or similar is still the best approach, but in that case most of the full depth of the cavity is still available to be filled with fiberglass.

All insulation types have some issues, which is a lot of why there are so many products on the market. I prefer fiberglass batts for my insulation after also reviewing: blown in fiberglass (much worse fiberglass dust issues, better R value and lower installed cost), cellulose (soaked in chemicals, minimal dust issues), cotton (soaked in chemicals, expensive, hard to work with, no dust issues), EPS foam (nothing but chemicals, smoke hazard in a fire, static cling makes retro-work a nightmare, expensive), Polyiso foam (nothing but chemicals, smoke and fire hazard in a fire, expensive, dust is an extreme irritant making retro-work a nightmare, high initial R value performance but uncertain long term performance). In comparison, fiberglass batts are inexpensive, relatively green, have low flammability (note: a plastic binder that is added to the glass is flammable, but there is very little of it), and naturally repels pests. Batts can be removed and re-installed as needed for retro-work. Batts generate a little dust and is a moderate irritant. I do not think there is any supporting evidence that the fibers are fine enough to cause cancer, but wearing a dust mask is still a good idea.

Installing fiberglass batts properly is very time consuming, negating some of the cost advantage of the material unless you are doing the installation yourself and do not mind expending your time.

Surendra Tomar: Nice video, very helpful. Thanks for sharing it.

If you are looking for Insulation Sup​plier & Manufacturer in Australia then can be a good option for you.

pepsifan850: Hey this is made out of cotton candy eat it

E. S.: "Lung Cancer" you need to charge enough money to cover your medical bills when you get lung cancer disease. specially if don't use a breathing mask ...

nieze: I know this is off topic, but I live in the tropics and I am researching everything from traditional methods, to concrete, to shipping container style homes. As you can assume, heat and humidity will be the two major evils in my project. So far I am leaning towards container style with 2x4 treated pine for internal framing. I was thinking would this type application work in this setting? It is quit difficult and super expensive to get proper supplies from the states. However, I am hopeing that the nearest island Guam will have some of the items needed for my project. Thanks for the channel. I learn so much.

Jason Crawford: Should you not use 6 mm polly?

Swinging The Hammer: I didn't realize that This Old House was even still a show.  lol.  Where's Bob Vila?

j3zusjuice: I usually caulk the exterior walls, polly the joist, and insulate the windows than foam. not in that exact order though.

Luis Guerra: good job.
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How to Install Fiberglass Insulation - This Old House