The text doesn’t imply that the wood will not split, it simply says it can be driven in without a pilot hole. For that matter a sheet metal screw can be driven into wood without a pilot hole.
The reason that the pilot hole offers an advantage is because there will be threads cut into the entire 360° contact surface of the hole. Without a pilot, the wood will split along the grain, maybe only a tiny amount but the laws of physics make no exception because of an advertised claim. Where there is no metal to wood contact there is no holding power and the pullout strength is compromised. But that’s why the pullout charts use a 2x safety factor. Dave B. said it clearly, “I'm not sure why anyone would knowingly expose themselves to a possible construction negligence claim.”. My 2¢ 2x Jim Duncan North Texas Renewable Energy Inc www.ntrei.com <http://www.ntrei.com/> NABCEP PV 031310-57 TECL-27398 nt...@1scom.net 817.917.0527 From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Benn At DayStarSolar Sent: Tuesday, July 03, 2012 5:36 PM To: RE-wrenches Subject: Re: [RE-wrenches] L feet no flashing in shingle roof I haven't read up on the mentioned structural screws yet, but do they specifically state that they can be driven "without" a pilot hole? What is the justification and how are they different so that they won't cause a board to split under pressure? Does anyone have some good info on this? benn Sent from a 'smart' phone, with tiny keys. Please excuse shortcuts and typos.
_______________________________________________ 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
