Underfloor and roof space insulating material for housing that does
not have health problems for asmatics>
What is recommended?

Hello,

Interesting question, I've found that most of alternative
hypoallergenic insulation uses natural ingredients, such as straw hay
bales, or cork to provide natural but still with very strong
insulation properties. The links below offer more detail. The straw
bale website specifically mentions asthma sufferer's happiness with
straw bale construction materials.


Additional Links:

Cork Flooring:
http://www.galleriacollection.com/naturalcork/

Straw Bale insulation:
http://www.harvesthomes.ca/benefits.htm

Synthetic plastics by Beaver Plastics:
http://www.beaverplastics.com/environment/environment.htm


Search Strategy:

hypoallergenic wall insulation on google:
://www.google.com/search?q=hypoallergenic+wall+insulation


Thank you for the opportunity to answer your question, if you require
more information, please clarify the question, or if you find this
answer satisfactory, please feel free to rate it. Thank you!

skermit-ga

Hello ambiorix, I hope you won't mind if I supplement the answer given
above.

Dust and mold are prime aggrivators for those living with asthma.
Designed to trap air and moisture, insulation is excellent storage for
mold and dust. The idea is to keep the offending organisms either out
of the insulation or at the very least out of your home, and keep your
indoor air quality (IAQ) up. The following post lists some
recommendations that may help to keep your home free of these
contaminants:
"Questions & Answers from the Sound Home Consultant #121-130"
http://www.soundhome.com/consult/121to130.shtml
-> scroll to heading "Attic Insulation for Asthma & Allergy"

Also note that "insulation containing formalin and formaldehyde should
be avoided as they can cause adverse effects even in people who do not
have asthma."
"Asthma on the move" (April 1998, asthma.org.uk) 
http://www.asthma.org.uk/infoan19.html

Additional resources:

The Asthma Friendly Home
http://www.asthmasa.org.au/asthmafriendly/home.html

American Academy of Allergy, Asthma and Immunology (AAAI)
http://www.aaaai.org/

IcyneneŽ Foam Insulation
http://www.icynene.com/


Hope this helps!
mother-ga

You should seriously consider Spray polyurethane foam for residential
insulation, it doesn't have the dust issue of cellulose or fiberglass
batts.
When looking into Spray Foam Insulation keep in mind that there are (2) types, 
Closed Cell (2 pound per square foot)& Open cell or "Icynene" (1/2
pound per square foot)
They both cost about the same, however the Closed Cell will give you
much better moisture resistance,twice the R-value, and add structural
strength to the building assemblies to which they are applied. Most
closed-cell spray foams are now using a non-ozone depleting blowing
agent.

Additionally, because closed-cell spray polyurethane foam resists both
air movement and water vapor movement, air barriers and vapor barriers
usually can be eliminated, further reducing the amount of building
material needed.
Visit http://www.foamrite.com

I found the spray foam insulation at http://www.foamrite.com and it
help reduced the dampness and moisture of my basement.