This is very interesting to me. I just added 2kW to my home and this thread inspired me. I did half the array using quick mount PV, and half the array using oatey flashing and a two piece stand-off. Along with that array I added a single module on a micro I picked up cheap. I attached that module with just L-feet and lexell. I used the L-feet on my garage because I just couldnt blast an L foot to the roof on my house.
I did pilot all the attachment. As a previous carpenter (third generation) it was the way I was taught. I will report back in thirty years. Jesse Sent from my iPhone On Jul 4, 2012, at 7:39 PM, Chris Mason <cometenergysyst...@gmail.com> wrote: > I've never had that luxury, generally the underside is visible and can't be > changed. We get through but it's a pain. > > On Wed, Jul 4, 2012 at 8:36 PM, benn kilburn <b...@daystarsolar.ca> wrote: > Chris, > I'm pretty sure that what David means by "blocking" is if the roof has > rafters (peak to eave) rather than purlins (horizontal) then, IF you can > access the underside of the roof, you properly install 'blocking' (2x4, 2x6, > 2x8) against the underside of the roof sheathing, perpendicular to the > rafters. Then you can drill your bolt anywhere along the blocking which then > eliminates the restriction of having to attach to a rafter every 16-24". > Keep in mind that there are proper methods of doing this to make sure the > blocking is properly attached to the rafters, otherwise any uplift pressure > from the array is only supported by the roof material and not the structure > (rafters/purlins) > > Then again, access to the underside of the roof is not always available or is > restrictive, so this is an important factor to figure out before you land on > site with your roof attachments and racking, ready to go. > > Cheers, > benn > > DayStar Renewable Energy Inc. > www.daystarsolar.ca > 780-906-7807 > Construction Electrician Solar Photovoltaic Systems Certified > Certificate # 0007S > HAVE A SUNNY DAY > > On 04/07/12 5:23 PM, "Chris Mason" <cometenergysyst...@gmail.com> wrote: > > I use corrugated mounting bridges - that's the problem. If the center of the > beam falls in the trough, the corrugated bridge is useless. > I am not sure how blocking would help. Corrugated is a pain. > > > > On Wed, Jul 4, 2012 at 12:11 PM, David Brearley > <david.brear...@solarprofessional.com> wrote: > In some cases, you can install blocking to get up on the ridge consistently. > One alternative to hangar bolts is to use corrugated mounting bridges from > DPW Solar or something similar from another company. > > Sorry I can't link to the PDF. Google: "corrugated mounting bridges" > > Since exposed-fastener metal roofs already have a bunch of holes in them, > you're not voiding the roof warranty by punching more holes in the ridge. (I > don't think these roofs even meet the NRCA definition of a "roof assembly" > because of the exposed penetrations.) Penetrations in the valleys on a roof > are problematic for obvious reasons. > > > On Jul 4, 2012, at 6:01 AM, Chris Mason wrote: > > > All of this refers to shingle roofs, which we don't see much of. We mostly > > deal with concrete and corrugated steel/galvalume, the latter being a > > nightmare. Does anyone have good ideas for dealing with corrugated? There's > > no way to flash it, the blocks are fine when you hit a beam on the ridge > > but half the time your penetration has to be on the trough of the > > corrugated steel. > > Other than lots of goop, I don't know how else to seal it. > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > > > > -- > Chris Mason > President, Comet Systems Ltd > www.cometenergysystems.com > Cell: 264.235.5670 > Skype: netconcepts > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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