[RE-wrenches] Flashings versus Sealants

[All Solar, Inc.]

Geocell is great stuff. 
I installed tubular skylights for years, and that's what the manufacturer supplied. I believe it was the 3300 pn which is polyurethane however and states it is for roofing!

Jeremy Rodriguez,
President

All Solar, Inc. 
1463 M
Penrose Colorado 81240
719-372-3808 office
719-372-3804 fax
www.asolarelectric.com

Sent by Jeremy's iPhone. Sorry for typos and shorthand!

> On Apr 15, 2014, at 2:37 PM, "Kirk Herander" <kirk at vtsolar.com> wrote:
> 
> I now use a product called Geocel "Green" 4500. Has the temperature
> properties Tom describes and bonds to EPDM, metal, asphalt, concrete, wood,
> the label says. Geocelusa.com. 
> 
> 
> Kirk Herander
> VT Solar, LLC 
> Un-Common quality since 1991
> www.vermontsolarnow.com
> dba Vermont Solar Engineering
> NABCEPTM Inaugural Certificant
> VT RE Incentive Program Partner
> 802.863.1202
> 
> -----Original Message-----
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Tom Lane
> Sent: Monday, April 14, 2014 9:59 PM
> To: re-wrenches at lists.re-wrenches.org
> Subject: [RE-wrenches] Flashings versus Sealants
> 
> Education time , Sikaflex is NOT recommended by the manufacturer to use on
> asphalt shingle roofs , no polyurethanes are recommended for asphaltic
> materials and they are not rated above 170 F . Likewise  no silicone
> sealants should be use as they DO NOT STAY ELASTOMERIC . PLEASE read the
> product specifications of the materials you are using . They must stay
> elastomeric from 40 F below zero to 200 F or they are not acceptable .
> Rubber butyl nitrile like Ruscoe www.ruscoe.com are the only type of
> sealants that have UV resistance and stay elastomeric and are rated from 40
> F below zero to 200 F . Do not argue against the product specifications on
> the product data sheets . All L feet and flashings should use a sealant , if
> you think you can use flashings without a sealant -  GOOD LUCK  - you will
> need it on a rain pouring down a roof with a hard rain blowing up the roof .
> Your job is only to stop leaks and keep high winds from blowing the PV
> modules , solar hot water collectors , o  r pool collectors off the roof .
> You do not create the solar electric energy or the thermal power . The
> roofing work is solely to install the product to code and under the PRODUCT
> SPECIFICATIONS of the roof materials you are using to prevent damage to the
> roof and the contents below . Stop using urethane sealants and silicone
> sealants period in harsh environments on this planet where they are not
> specified by the manufacturer on the product data sheets would be a
> beginning . Only lead or copper , aluminum , marine grade stainless steel
> flashings for piping will last for 100 years . Aluminum and copper flashings
> must be used with the appropriate materials . Metal roofs sometimes require
> EDPM rubber flashings for pipe penetrations ,BUT , it must be protected from
> direct UV light to last 100 years . Gator Tom PS : sealants should be under
> the L feet or U channels or flashings on the roof AND over the top of the
> lag bolts , j or hook bolt , or all thread rod bolts nuts . 
> 
> 
> Sent from my iPad
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