Folded Homes FAQs
Toxicity of Combustion: “In a fire situation the amount of smoke and the toxicity
of the smoke is perhaps more serious than the burn rate. Smoke evolution is
dependent on the available oxygen present, but polypropylene copolymer
normally generates little smoke. This is not true for many other thermoplastics.
The compounds of combustion of polyolefin plastics are not highly toxic except
for carbon monoxide which will be formed when any organic matter - e.g. paper,
wood or gasoline burns. In fact, the carbon monoxide given off by burning
[polypropylene] is less than for cardboard or hardboard.”
[1]
Flame Spread:
FH Yurts
are Class C structures from the perspective of flame
spread.
“Flame Spread [is] the measure of a material’s relative burning behavior. Both
the flame spread and smoke developed are measured in accordance with ASTM
E84.”
[2]
“The Flame Spread Rating [is] a measure of the relative flame spread, and
smoke development, from a material being tested. The flame spread rating is a
single number comparing the flame spread of a material with red oak, arbitrarily
given the number 100 and asbestos cement board with a flame spread of 0.
Building codes require a maximum flame spread of 25 for insulation installed in
exposed locations.”
[3]
“Flame Spread Classes: the UBC and BOCA codes use the I-II-III designation,
and the Standard code uses A-B-C. The flame spread categories are as follows
per ASTM E-84/UL 723:
•
Class A or I: Flame spread 25 or less (Fire Retardant Treated Wood,
some Fire Retardant surface coatings)
•
Class B or II: Flame spread 26 to 75 (other Fire Retardant surface
coatings)
•
Class C or III: Flame spread 76 to 200 (untreated lumber and plywood)”
[4]
[1] Health and Safety Aspect of Coroplast Products - Technical Bulletin - CSS-
033-93
http://www.usg.com/navigate.do?resource=/USG_Marketing_Content/usg.com
/web_files/resources/architects/FireResistance-Page.htm
http://www.electromn.com/glossary/f.htm
http://www.uslumber.com/Exterior-X%20Flame%20Spread.pdf
[See PD:
EXTRUDED PLASTIC OPTIONS – FIRE RETRADANT
(Updated 1/24/2008)
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