[RE-wrenches] to flash or not to flash

Thu Aug 6 13:32:05 PDT 2015

Tump,

Glad you feel you have a superior method.  Please feel free to use it but
do not assume that your process is superior for others and hence infer an
alleged best practice.

Silicone does indeed react with aluminum; it bonds with it by etching the
surface.  This is a good thing.

I agree with you on looking out for polyurethane products (some made by
Sika) that asphalt degrades!   No need to wander far, silicone works great
and stays flexible indefinitely.  Polyurethane has some great properties
but is not oil or bitumen(asphalt) resistant.

Conrad

On Thu, Aug 6, 2015 at 3:25 PM, Tump <tump at swnl.net> wrote:

> Silicone is not a roof mastic and it does react to Alu despite your record
> w/ your historic installation methods. We and our industry are now in the
> 21st century with 21 century requirements and many hi quality roof mastic
> sealants. The way I figure it is that I am a professional solar installer,
>  I am not a roofer nor a sealant engineer but they have provided our
> industry with requirements and products to ensure my clients receive hi
> level of quality installations despite the costs.
> On Aug 6, 2015, at 2:13 PM, Jason Szumlanski wrote:
>
> This started as an asphalt shingle attachment discussion, so it's
> important to note that many of the sealants from Sika are NOT compatible
> with asphaltic/bitumunous surfaces. Many competitors are still using
> products from this company that are specifically noted by the manufacturer
> as not compatible with the materials being sealed. Make sure your sealant
> is compatible with the roof!
>
>
>
>
> On Thu, Aug 6, 2015 at 1:34 PM, <Jarmo.Venalainen at schneider-electric.com>
> wrote:
>
>> Hi:
>>
>> People may already know about this, but I thought I would pass it on in
>> case some dont.
>>
>> We do a lot of work with the boating and RV industry in the US and
>> overseas.
>>
>> One sealant name which has come up a lot with strong positive reviews
>> regarding age related drying/shrinking not only in the US but overseas as
>> well is SIKA.
>>
>> Here's a link to their website,
>>
>> http://usa.sika.com/
>>
>> JARMO
>>
>> _____________________________________________________________________________________
>>
>> * Jarmo Venalainen*  |  * Schneider Electric **  |  Xantrex Brand*  |
>> *CANADA*  |   *Sales Application Engineer*
>> * Phone:* +604-422-2528  |   *Tech Support:* 800-670-0707  |   *Mobile:*
>> +604-505-0291
>> * Email:* *jarmo.venalainen at schneider-electric.com*
>> <jarmo.venalainen at schneider-electric.com>  |   *Site:** www.Xantrex.com*
>> <http://www.xantrex.com/>  |   *Address:* 3700 Gilmore Way, Burnaby, BC
>> V5G4M1
>> <Mail Attachment.gif> <http://www.xantrexrebate.com/>
>>
>> From: "Matt Partymiller" <matt at solar-energy-solutions.com> To: "RE-wrenches"
>> <re-wrenches at lists.re-wrenches.org>, Date: 08/06/2015 10:16 AM Subject: Re:
>> [RE-wrenches] to flash or not to flash Sent by: "RE-wrenches" <
>> re-wrenches-bounces at lists.re-wrenches.org>
>> ------------------------------
>>
>>
>>
>> Daniel,
>>
>> My answer is to flash until others prove me wrong.
>>
>> I am in the same position you are, speaking to the same manufacturers you
>> are, and probably dealing with the same low competitor pricing you are.
>> These products sure sound tempting.
>>
>> Over the past decade I have probably removed a dozen 80's era hot air or
>> hot water systems that were directly attached to roofs (installed by
>> others).  In every instance the roof was a complete mess and required deck
>> replacement.  I now tell homeowners just to contact a roofer and have them
>> dispose of the collectors in the process of re-roofing - we will come out
>> after the new roof is in place.
>>
>> I think you summed up the sealant problem quite well.  I sell my systems
>> as a 25 year product.  I am not satisfied that butyl is a 25 year answer.
>> Until someone convinces me otherwise, I will relate as much to my
>> customers and proceed with proper flashings.
>>
>> Good poll.
>>
>> Matt
>>
>>
>> Matthew Partymiller
>> Solar Energy Solutions LLC
>> (877) 312-7456
>> matt at solar-energy-solutions.com
>>
>>
>> On Thu, August 6, 2015 12:47 pm, Daniel Young wrote:
>> > Writing the subject above, it seems like I've heard this question on the
>> > wrench list before, but I could not find it in my old email archives.
>> Feel
>> >  free to pint me back to the old discussion if it's there.
>> >
>> >
>> >
>> > I've been using a flashing based roof attachment for 8+yrs now (quick
>> > mount or similar). Now we are looking at Rail-less systems  (quick rack
>> is
>> > a good example). There is also a non-flashed rail-less racking from
>> > roof-tech http://roof-tech.us/ . I've always been of the opinion that
>> > simply crushing some sealant/gasket onto an asphalt shingle work fine at
>> > first (the test data from roof-tech is impressive), but would be an
>> issue
>> > 10+yrs down the
>> > road (thermal expansion movement, freeze/thaw, etc). I can make a good
>> > waterproof seal at first by just slathering some butyl/silicone to an
>> > L-foot
>> > and cranking it down on the shingles, but that practice really
>> disappeared
>> >  8+yrs ago.
>> >
>> >
>> >
>> >
>> > Maybe consider this a Poll: (to flash, or not to flash)
>> >
>> >
>> >
>> >
>> > With Regards,
>> >
>> >
>> >
>> >
>> > Daniel Young,
>> >
>> >
>> > NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90
>> >
>>
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