Do it Yourself: [DIY] Re: (exterior is OK!) DIY Spray Foam Insulation

10 February 2013

[DIY] Re: (exterior is OK!) DIY Spray Foam Insulation

hmmm Boo-hoo!! I think we started this whole
thing aabout ceiling (interior) vs. roof (exterior) roof insulatio!
LOL

http://groups.yahoo.com/group/DoIt_Yourself/message/59740

Anyway///the kits are below and exterior note are below....

http://www.energyefficientsolutions.com/foamproducts.asp#SAFETYKIT

Also..it is quite fine/ok/good to use on exterior roofing...the
foam is coated with a white elastomer coating after it cures and can
be walked upon when set (24 hrs). Also there are bascially
two types of these foams...we found them to be 1) Pourable and
2) Sprayable..the pourable is the one not recommended for outside
use as it is a void filler and takes a longer time to cure/set.

http://www.aosincsuperiorroofing.com/commercial-roof-in-san-diego/foam-roof-in-san-diego.aspx

For exterior spray foam on a flat roof we already have 3 verbal
quotes with appointments to get written
quotes...The expense is nominal compared to adding new roof
lumber with air space/insulation/vapor barrier and asphalt
top layer (for flat roof)....Quotes have come in about $2
a square foot for R6 and multiples of that for R12, etc.

All the contractors and foam mfgs clearly state it is common
since the 1980's (if memory serves right..it could be the early'90's).. to use foam on roofing exposed to elements!

And the only cautions we have had is that it should be sprayed
evenly in one layer (if want R12 or more for example) and coated
when cured so the birds do not peck at the foam maily)

there are disadvantages however, listed here:

http://www.ehow.com/list_7204078_disadvantages-polyurethane-foam-roofing-systems.html

Rich and Kate

--- In DoIt_Yourself@yahoogroups.com, "LarenCorie" wrote:
>
> Posted by: "ronaldwswanson" ronswanson@...
>
> > Now I see that even Amazon sells spray foam kits -
> > Thanks forever to Dale and Ray - You have my eternal gratitude.
>
> Hi Ron;
>
> Do not decide too quickly. The stuff costs
> over twice as much as new rigid foam. Recycled
> rigid foam costs a fraction as much as new. Also,
> be sure to read the full specs and data sheets. All
> the foam kits I have checked say that they should
> not be used as an exterior roofing. Rigid foam is
> what gets use on most commercial buildings that
> have flat roofs. It is covered with white EPDM
> roofing, to completely seal it, and reflect sunlight.
> It can be bought wholesale, 2" or even thicker.
>
> -Laren Corie-
> Natural Solar Building Design and
> Solar Heating/Natural Cooling/Energy
> Efficiency Consultation Since 1975
> www.ThermalAttic.com (many new
> photos and pages, coming soon)
>
> Read my Solar house design articles in:
> -Energy Self-Sufficiency Newsletter-
> www.essnmag.com
>
> Home base-LittleHouses YahooGroup
> http://groups.yahoo.com/group/LittleHouses/
>
> Founder-WoodGas - Power from wood
> http://groups.yahoo.com/group/WoodGas
>
> Founder-RefrigeratorAlternatives YahooGroup
> http://groups.yahoo.com/group/RefrigeratorAlternatives
>