[RE-wrenches] Flashings versus Sealants

[Kirk Herander]

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 . 


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