What's The Greenest Insulation? It's Getting Harder To Decide Every Day
Screen shot from Youtube video
What's wrong with this picture? It is in a video promoting Ultra-touch denim insulation, showing an installer pushing a full-size batt into an irregular cavity. Either the insulation isn't going to work because it is compressed or it is going to pop the drywall right off the wall. The installer also isn't wearing a mask, even though the company's material safety data sheet recommends an OSHA approved air mask. (the stuff is vermin-proofed with borax). It is just one of the problems that Tristan Roberts of BuildingGreen finds with the product.
Even though I got seriously schooled by an Ultratouch distributor at a home show last year, I still have problems with batt insulation; it is rarely properly installed around electric wires and other irregularities and does not seal as well as sprays. Others are also complaining that using old jeans means that it is contaminated with fabric softeners; one commenter to Tristan's post complained:
Post consumer recycled jeans are not good for the chemically sensitive, for whom this is a prime product. Most of those jeans will have been washed multiple times in scented detergent and dried in driers with bounce fabric softener. You can *NEVER* get that stuff out. So much for bonded logic.
More on Denim Insulation:
What's The Greenest Insulation?
UltraTouch Recycled Denim Insulation
Recycled Denim Insulation Guide
Is Sprayed Polyurethane Insulation Safe?
I was particularly fond of polyurethane insulations, whether open celled like Icynene or soy-based, or even the regular stuff, but now there are increasing concerns about their safety because of the outgassing of isocyanates. There are also concerns about the ability deconstruct or recycle down the road, because it sticks to everything. To top it all off, it is toxic when it burns; that's why I think if you use it, you should also install sprinklers.
Polystyrene Insulation Doesn't Belong in Green Building
Then of course there is the issue of toxic fire retardants in polystyrene. Some think it is good enough to get cradle to cradle silver; others, like Arlene Blum say "It is shocking that a product containing a persistent organic pollutant such as HBCD can be considered green." (others complain more about the fact that it is a petrochemical product).
There are so many issues with fiberglass it is hard to know where to start; it doesn't work very well, it may be dangerous (see More Chemicals Added To HHS List Of Known or Suspected Carcinogens) and some think it should be banned because it is installed so badly so often.
We have not written a lot about sprayed cellulose, but will be doing more; it is made from recycled content, has the lowest energy input of any insulation, seals well and I have seen few complaints, although people with multiple chemical sensitivities worry about the inks.
Perhaps Al Gore got it right; he insulated his house with AirKrete, a foamed magnesium oxide cement that is fireproof, has no toxic chemicals, and is mold, bug and water resistant.
You can look at Planet Green and our Green Insulation Guide, but I would rewrite the whole thing now.