Sorry if this went through twice; the list scrubbed my attachment and bounced the message. -------------------------- I have an ancient (1999) spec sheet from ITWBuildex (contact me offlist for a copy) for the #14 Roofgrip screws that we used to get from DPW to use on their Easy Feet. It lists plywood thicknesses and associated pull-out strengths (3/8" = 326 lbs, 1/2" = 436 lbs, 3/4" = 728 lbs. There are probably a few fastener manufacturers that have a screw rated for pull-out on plywood, it's just a matter of tracking that information down. Maybe a good fastener store could help find some, like Harrison & Bonini in San Francisco. Or keep trying to get an updated spec from DPW, or at least a current product name they suppply if it is not Roofgrip. Try Jeff Randall ( [email protected]); you need to talk to one of their engineers to get anything besides basic pricing and availability.
BTW, those screws are rated for plywood only, not OSB. One last thought: now that you can find a pull-out number, you might want to check the point loading per area with the foam on the roof. For example, if each point load is 40 lbs and you use a post with a 4" x 4" base, then the distributed point load is 2.5 psi. Doesn't sound like much, but could be worth checking. A while back we had DPW make us some custom Easy Posts with large bases to decrease that point load off the foam roof (solar thermal, a little heavier, on the roof of a foam guy's house so he knew his product and asked us for this specifically). -Phil Phil Boutelle Project Engineer NABCEP Certified Solar PV Installer TM Real Goods Solar, Inc. www.RealGoodsSolar.com <http://www.iesolar.com/> On Tue, Jul 20, 2010 at 12:38 AM, Philip Boutelle <[email protected]>wrote: > I have an ancient (1999) spec sheet from ITWBuildex (attached here, don't > know if it will reach the entire list or not) for the #14 Roofgrip screws > that we used to get from DPW to use on their Easy Feet. If you can't see the > spec sheet, it lists plywood thicknesses and associated pull-out strengths > (3/8" = 326 lbs, 1/2" = 436 lbs, 3/4" = 728 lbs. There are probably a few > fastener manufacturers that have a screw rated for pull-out on plywood, it's > just a matter of tracking that information down. Maybe a good fastener store > could help find some, like Harrison & Bonini in San Francisco. Or keep > trying to get an updated spec from DPW, or at least a current product name > they suppply if it is not Roofgrip. Try Jeff Randall ( > [email protected]); you need to talk to one of their engineers to > get anything besides basic pricing and availability. > > BTW, those screws are rated for plywood only, not OSB. > > One last thought: now that you can find a pull-out number, you might want > to check the point loading per area with the foam on the roof. For example, > if each point load is 40 lbs and you use a post with a 4" x 4" base, then > the distributed point load is 2.5 psi. Doesn't sound like much, but could be > worth checking. A while back we had DPW make us some custom Easy Posts with > large bases to decrease that point load off the foam roof (solar thermal, a > little heavier, on the roof of a foam guy's house so he knew his product and > asked us for this specifically). > > > -Phil > > > Phil Boutelle > > Project Engineer > NABCEP Certified Solar PV Installer TM > Real Goods Solar, Inc. > www.RealGoodsSolar.com <http://www.iesolar.com/> > > On Mon, Jul 19, 2010 at 10:06 PM, Nick Soleil > <[email protected]>wrote: > >> It is important that the 'Easy Feet' or similar product is installed >> on a roof that meets certain criteria, as per the manufacturer. Other >> comparable products require ~1/2" (15/32") plywood or particle roof >> sheathing which is installed with a minimum specified nail pattern. The >> calculations would be affected by the spacing between the roof and the >> modules, and the amount of air that can get under the modules. If the >> panels are flush to the roof, then there is little or no uplift. >> >> Nick Soleil >> Project Manager >> Advanced Alternative Energy Solutions, LLC >> PO Box 657 >> Petaluma, CA 94953 >> Cell: 707-321-2937 >> Office: 707-789-9537 >> Fax: 707-769-9037 >> >> >> ------------------------------ >> *From:* benn kilburn <[email protected]> >> *To:* Wrenches <[email protected]> >> *Sent:* Mon, July 19, 2010 9:34:32 PM >> *Subject:* Re: [RE-wrenches] attaching to roof decking - Foam Insulation >> Install >> >> after a few requests, i have not been getting any feedback from Direct >> Power regarding pull out specs for their 'easy feet', which i need for my >> engineer to be able to give me the go-ahead to use them. >> does anyone care to comment on the fact that this mounting method only >> attaches to the roof decking and not the rafters? >> >> i have always been under the impression that if you only attach your >> racking to the roof decking, it (the decking) could 'rip right off the roof' >> in that worst case scenario wind storm! but by anchoring to the trusses, the >> whole roof structure would/should withstand the wind load. >> or maybe i was just under the wrong impression and the spiel was that the >> decking would not hold the screws and the screws would pull out! >> so am i to understand that by using several (of the right size) screws at >> each anchor point, the decking (if adequate) will be able to support an >> array (even if tilted up to 60 deg)??? >> >> cheers, >> benn >> >> DayStar Renewable Energy Inc. >> [email protected] >> 780-906-7807 >> HAVE A SUNNY DAY >> >> >> >> ------------------------------ >> From: [email protected] >> To: [email protected] >> Date: Mon, 19 Jul 2010 16:32:23 -0700 >> Subject: Re: [RE-wrenches] Foam Insulation Install >> >> I have also had a great experience using "Easy Feet" from Direct Power. >> You use four of their screws per foot and Jeff Randall there can give you >> pull out specs in roof decking, as I recall they match or exceed that of the >> Lag/rafter combo. >> >> Bill >> >> Feather River Solar Electric >> 4291 Nelson St. >> Taylorsville, CA 95983 >> 530-284-7849/6544 fax >> >> ----- Original Message ----- >> >> *From:* [email protected] >> *To:* RE-wrenches <[email protected]> >> *Sent:* Monday, July 19, 2010 12:24 PM >> *Subject:* Re: [RE-wrenches] Foam Insulation Install >> >> Antony, >> Right on! The Eco-fasten will solve the issue - it's been pull-out tested >> sans-rafter penetration. Have bought the eco-green fasteners from them, will >> again. As far as dealing with them - it's a great pleasure to be able to >> *talk* to someone with good product knowledge that will take the time to >> answer stupid questions. >> >> Holt E. Kelly >> Holtek Fireplace & Solar Products >> 500 Jewell Dr. >> Waco TX. 76712 >> 254-751-9111 >> www.holteksolar.com >> >> ----- Original Message ----- >> *From:* Antony Tersol <[email protected]> >> *To:* [email protected] >> *Sent:* Monday, July 19, 2010 11:33 AM >> *Subject:* [RE-wrenches] Foam Insulation Install >> >> Have you looked at EcoFasten mounting. They have a mount that uses 8 >> screws per attachment, so can theoretically hold without going into the >> rafters. Then could use a large flashing over that to integrate with the >> shingles. >> >> I think they're an offshoot of AlpenSnowguards in Vermont. We started >> working with Alpen to source S5 clamps several years ago, and have found >> them great to work with. >> >> We're a West coast company - there were lots of other distributors closer, >> but Alpen got and kept our business. It's kind of funny - when I call them, >> I feel like I'm talking with someone in one of those old hardware stores >> with everything you need right there in bins, and when I call the other guys >> it seems like someone in a sales office who never handles the product. >> >> The EcoFasten crew is similarly helpful, and they have some well thought >> out products. The name I have in my rollodex is Chris Sterns, at >> 877-859-3947. >> >> http://www.ecofastensolar.com/our-products/eco-fasten >> >> <http://www.ecofastensolar.com/our-products/eco-fasten>Their website is >> pretty comprehensive, and includes leak and load tests and building code >> info. Other cool mounting products too. >> -- >> Antony Tersol >> Solex / Applied Solar Energy >> 831-333-1919 >> >> You wrote: >> >> For residential install with the spray foam insulation >> >> Underside of deck has 12"+ of foam.....no way to accurately locate rafter >> there.....hammer and ear also out of the question...........don't think >> any >> of the stud finders will work....been told that peeling back shingles to >> locate rafter is only accurate way.......would like to avoid that if >> possible..........any suggestions? >> >> Holt E. Kelly >> Holtek Fireplace & Solar Products >> 500 Jewell Dr. >> Waco TX. 76712 >> 254-751-9111 >> www.holteksolar.com >> >> ------------------------------ >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: [email protected] >> >> 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 >> >> >> ------------------------------ >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: [email protected] >> >> 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 >> >> >> ------------------------------ >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 8.5.441 / Virus Database: 271.1.1/3015 - Release Date: 07/19/10 >> 06:36:00 >> >> >> ------------------------------ >> Enter for a chance to get your town photo on Bing.ca! 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