Bill, Can you provide a link to the product you are using - I found a lot of screws on that site but none called "structural".
Thanks Chris On Mon, Jul 2, 2012 at 7:08 PM, Bill Hoffer <[email protected]> wrote: > Mark > > Lags for me are old hat after using the newer structural screws. I get > them local from www.screw-products.com although I know there are more > companies out there that make them for the Structural Insulation Panel > industry. Thinner than lags with comparable strength, they drive easy with > no predrilling, and are less likely to blow out a truss. Come in many > different lengths and use a special star head with a built in washer. I > use thick butyl tape on the foot and a small rubber washer on the screw > head , together they work great! If you want a little more security a dab > of the appropriate sealer in the foot slot before finally tightening it > down works too. Only way to go on corrugated metal roofs where there is no > real option for flashing. > > Bill > > > On Mon, Jul 2, 2012 at 3:40 PM, <[email protected]> wrote: > >> My 18V Milwaukee cordless hammer drill has no trouble driving a 5/16" lag >> into anything I've ever encountered. >> If you put the lag anywhere near the middle of the rafter it won't split. >> If it splits, it must be some cheap stuff from Home Depot. >> Only an engineer with no practical experience would insist on a pilot >> hole and the resulting reduction in holding strength. I'm assuming the IBC >> consists of a bunch of bureaucrats that value control over common sense. >> In this instance flashing offers no benefit, and may even be >> counter-productive if incorrectly installed and it causes rain to collect >> under it. My experience is in northern Indiana where it does rain and the >> wind does blow. (Record 91 mph winds last Thursday.) Less severe weather >> than Michigan, but close. >> I use the best silicone caulk Menards has to offer. I've never worried >> about compatibility. It definitely won't dry up and crack away like the >> black roof cement some swear by and insist on. 15+ year old silicone caulk >> is yellowed a bit but that's the only change. >> If the silicone and shingle aren't getting along, I've never heard them >> complain. >> >> Mark >> (Disclaimer: Portions of the preceding are the opinions of the author.) >> >> -------- Original Message -------- >> Subject: Re: [RE-wrenches] L feet no flashing in shingle roof >> From: Dave Click <[email protected]> >> Date: Mon, July 02, 2012 10:29 am >> To: [email protected] >> >> I always thought that installing lag screws was tough enough with pilot >> holes- I should hit the gym. I'm not a structural PE, but I think that >> not drilling pilot holes violates the American Wood Council's National >> Design Specs and therefore violates the IBC too. I would imagine that >> you'd be much more likely to split your trusses. IBC also requires >> flashings be used but at least around here inspectors never ask for it >> (which makes sense- as you all know, Florida never sees wind or rain, >> and definitely not at the same time). What silicone do you use that's >> compatible with asphalt shingles? >> >> DKC >> >> On 2012/7/1 21:13, [email protected] wrote: >> > In my 20 year experience of lagging down L feet on shingle roofs in >> > Indiana with a good dollop of silicone caulk under the foot, I've never >> > had an issue. No pre-drilling, just drive the lag home. Drilling a hole >> > first is not necessary, and reduces holding strength. No reason to make >> > a science project out of it and increase cost and labor. >> > >> > Mark >> > >> > -------- Original Message -------- >> > Subject: Re: [RE-wrenches] L feet no flashing in shingle roof >> > From: Drake <[email protected] >> > <mailto:[email protected]<[email protected]> >> >> >> > Date: Fri, June 29, 2012 3:09 pm >> > To: RE-wrenches <[email protected] >> > <mailto:[email protected]<[email protected]> >> >> >> > >> > Hi Jay, >> > >> > There is no room for flashings. The L feet will go very close to the >> > skylights and the flashing would hit the edge of them. Plus there is >> > an existing array that was done by another installer that is done >> > with L feet only. The new array would be higher. >> > >> > >> >> And given that we have really good off the shelf approved flashed >> >> feet, why would you use anything else? >> >> >> >> My 2 cents, >> >> >> >> Jay >> >> >> >> peltz power >> >> >> >> >> >> On Jun 29, 2012, at 5:16 AM, Glenn Burt wrote: >> >> >> >>> We have used a variety of sealants over the years, and determined >> >>> simple Henry roofing cement is the best product for use on comp >> >>> roofing. >> >>> >> >>> We also used to bend our own L-foot flashing, which we cut from >> >>> standard Al coil stock (before all the manufactured options were >> >>> available). This might be a good option for you in this case. >> >>> >> >>> >> >>> >> >>> Glenn >> >>> >> >>> *From:* [email protected] >> >>> <mailto:[email protected]<[email protected]> >> > >> >>> [mailto:[email protected]<[email protected]>] >> *On Behalf Of >> >>> *Drake >> >>> *Sent:* Thursday, June 28, 2012 6:40 PM >> >>> *To:* RE-wrenches >> >>> *Subject:* [RE-wrenches] L feet no flashing in shingle roof >> >>> >> >>> I'm quoting a job that has an existing array with L feet bolted >> >>> down to a shingle roof with no flashings. I want to match the >> >>> height of the existing array. Also some modules are being worked >> >>> in around skylights where it is unlikely that room would be >> >>> available for flashings to center over rafters. >> >>> >> >>> I've always used flashings. Would it be completely crazy to >> >>> follow suit of the existing array and bolt L feet straight to the >> >>> shingle roof with good roof sealant? If so, how would you seal it? >> > Drake Chamberlin >> > ATHENS ELECTRIC LLC >> > OH License 44810 >> > CO license 3773 >> > NABCEP Certified PV >> > ------------------------------------------------------------------------ >> > _______________________________________________ >> > List sponsored by Home Power magazine >> > >> > List Address: [email protected] >> > <mailto:[email protected]<[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 >> > <http://www.re-wrenches.org/etiquette.htm> >> > >> > Check out participant bios: >> > www.members.re-wrenches.org <http://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 >> > >> _______________________________________________ >> 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 >> >> >> > > > -- > Bill Hoffer PE > NABCEP Certified Solar PV Installer™ > Sunergy Engineering Services PLLC > 2504 Columbia Ave NW > East Wenatchee WA 98802-3941 > [email protected] Cell:(509)679-6165 > > > > _______________________________________________ > 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 > > > -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts
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