T-Mack, My opinion is that you may use 225 sq ft for your spacing here: Combustible Unobstructed, exposed members 3 ft or more on center (your exposed wood members are infinity apart). Your open truss members are: A) not combustible, and B) they do channel heat (please tell me they are at least 70% open. that can be the catch here) It should be recognized that the above is my opinion as a member of the NFPA, and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects and should therefore not be considered, nor relied upon, as the official position of the the NFPA, nor any of their technical committees.
Advertising
Sincerely, Cecil Bilbo Academy of Fire Sprinkler Technology Champaign, IL 217.607.0325 www.sprinkleracademy.com ce...@sprinkleracademy.com OUR STUDENTS SAVE LIVES!! > Date: Wed, 6 May 2015 11:41:47 -0700 > From: tm...@mfpdesign.com > To: sprinklerforum@lists.firesprinkler.org > Subject: Re: Attic > > That would be my thoughts as well, but there doesn't appear to be > wording in the standard that indicates such. Therefore, I will have to > defer to the letter of the standard and stick with 130 max spacing. > > Travis Mack, SET > MFP Design, LLC > 2508 E Lodgepole Drive > Gilbert, AZ 85298 > 480-505-9271 > fax: 866-430-6107 > email:tm...@mfpdesign.com > > http://www.mfpdesign.com > https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > Send large files to us via: https://www.hightail.com/u/MFPDesign > > On 5/6/2015 11:19 AM, Brad Casterline wrote: > > Unobstructed means just that. > > Noncomb. members means no closley spaced, light, fast burning 'kindling'. > > I would vote 225 sf max if my vote counted. > > > > -----Original Message----- > > From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] > > On Behalf Of Travis Mack > > Sent: Wednesday, May 06, 2015 12:40 PM > > To: sprinklerforum@lists.firesprinkler.org > > Subject: Re: Attic > > > > That makes sense. I was grabbing for straws. Customer missed it because of > > steel framing. Didn't catch plywood sheathing. I was hoping to be able to > > help cut down sprinkler count. > > > > Travis Mack, SET > > MFP Design, LLC > > "Follow" us on Facebook: > > https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > > Send large files to MFP Design via: > > https://www.hightail.com/u/MFPDesign > > > > Sent from my iPhone > > > >> On May 6, 2015, at 10:25 AM, Eric V. Tysinger <e...@wiginton.net> wrote: > >> > >> I would think that the spacing of the members is addressed as potential > > obstructions. Less than 3' means there are more members between each > > sprinkler, so the maximum spacing is reduced to lessen the number of > > obstructions. I don't think the combustibility of the members plays a part. > > The table only cares if it is non-combustible or combustible construction, > > obstructed or unobstructed, and the spacing of the members. > >> > >> > >> Eric V. Tysinger > >> Designer > >> Wiginton Fire Systems - Miami, FL > >> Email: e...@wiginton.net > >> Main: 305-888-2402p3416 > >> Direct: 305-830-0490 > >> Fax: 305-888-3804 > >> Mobile: 239-633-9703 > >> > >> > >> > >> Confidentiality Notice: > >> This e-mail message, including any attachments, is for the sole use of the > > intended recipients and may contain confidential and privileged information. > > Any unauthorized review, use, disclosure or distribution is prohibited. If > > you are not the intended recipient, please contact the sender by reply > > e-mail and destroy all copies of the original message. > >> -----Original Message----- > >> From: Sprinklerforum > > [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Travis > > Mack > >> Sent: Wednesday, May 06, 2015 1:17 PM > >> To: sprinklerforum@lists.firesprinkler.org > >> Subject: Re: Attic > >> > >> That was my question. Does the non combustible framing members modify > > that, or allow for any changes? I am aware of using that for combustible > > members. > >> Travis Mack, SET > >> MFP Design, LLC > >> "Follow" us on Facebook: > > https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > >> Send large files to MFP Design via: > >> https://www.hightail.com/u/MFPDesign > >> > >> Sent from my iPhone > >> > >>> On May 6, 2015, at 10:06 AM, Eric V. Tysinger <e...@wiginton.net> wrote: > >>> > >>> Wouldn't table 8.6.2.2.1(a) indicate 130sqft max? > >>> > >>> Combustible, Unobstructed, with exposed members less than 3'-0 on center. > >>> > >>> > >>> > >>> > >>> Eric V. Tysinger > >>> Designer > >>> Wiginton Fire Systems - Miami, FL > >>> Email: e...@wiginton.net > >>> Main: 305-888-2402p3416 > >>> Direct: 305-830-0490 > >>> Fax: 305-888-3804 > >>> Mobile: 239-633-9703 > >>> > >>> > >>> > >>> Confidentiality Notice: > >>> This e-mail message, including any attachments, is for the sole use of > > the intended recipients and may contain confidential and privileged > > information. Any unauthorized review, use, disclosure or distribution is > > prohibited. If you are not the intended recipient, please contact the sender > > by reply e-mail and destroy all copies of the original message. > >>> -----Original Message----- > >>> From: Sprinklerforum > >>> [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of > >>> Travis Mack > >>> Sent: Wednesday, May 06, 2015 12:43 PM > >>> To: sprinklerforum@lists.firesprinkler.org > >>> Subject: Re: Attic > >>> > >>> It is not fire treated. I already tried that route. I feel like 225 would > > be acceptable. Which also begs the question, would ex cov be acceptable? It > > is unobstructed construction. I believe the ex cov sprinklers are allowed > > for unobstructed combustible. > >>> Just a rare situation. > >>> > >>> Travis Mack, SET > >>> MFP Design, LLC > >>> "Follow" us on Facebook: > >>> https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > >>> Send large files to MFP Design via: > >>> https://www.hightail.com/u/MFPDesign > >>> > >>> Sent from my iPhone > >>> > >>>> On May 6, 2015, at 9:21 AM, Todd - Work <t...@fpdc.com> wrote: > >>>> > >>>> Good question. I think you could go to 225, but the Book doesn't > >>>> address it. I assume the plywood is not fire treated? Most of the > >>>> times I see this arrangement, the plywood is treated. > >>>> > >>>> Todd G Williams, PE > >>>> Fire Protection Design/Consulting > >>>> Stonington, CT > >>>> www.fpdc.com > >>>> 860-535-2080 (ofc) > >>>> 860-608-4559 (cell) > >>>> Sent using CloudMagic > >>>> [https://cloudmagic.com/k/d/mailapp?ct=ti&cv=6.0.64&pv=8.2] > >>>> On Wed, May 6, 2015 at 12:04 PM, > >>>> sprinklerforum@lists.firesprinkler.org > >>>> <sprinklerforum@lists.firesprinkler.org> wrote: > >>>> For an attic with light gauge steel trusses spaced 24" on center and > >>>> plywood deck sheathing, would the spacing be limited to 130 sq ft or > >>>> would 225 be acceptable? Slope is 3:12. > >>>> > >>>> Travis Mack, SET > >>>> MFP Design, LLC > >>>> "Follow" us on Facebook: > >>>> https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > >>>> Send large files to MFP Design via: > >>>> https://www.hightail.com/u/MFPDesign > >>>> > >>>> Sent from my iPhone > >>>> _______________________________________________ > >>>> Sprinklerforum mailing list > >>>> Sprinklerforum@lists.firesprinkler.org > >>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprink > >>>> l er.org _______________________________________________ > >>>> Sprinklerforum mailing list > >>>> Sprinklerforum@lists.firesprinkler.org > >>>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprink > >>>> l > >>>> er.org > >>> _______________________________________________ > >>> Sprinklerforum mailing list > >>> Sprinklerforum@lists.firesprinkler.org > >>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > >>> er.org _______________________________________________ > >>> Sprinklerforum mailing list > >>> Sprinklerforum@lists.firesprinkler.org > >>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > >>> er.org > >> _______________________________________________ > >> Sprinklerforum mailing list > >> Sprinklerforum@lists.firesprinkler.org > >> > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > >> _______________________________________________ > >> Sprinklerforum mailing list > >> Sprinklerforum@lists.firesprinkler.org > >> > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > > Sprinklerforum mailing list > > Sprinklerforum@lists.firesprinkler.org > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > > _______________________________________________ > > Sprinklerforum mailing list > > Sprinklerforum@lists.firesprinkler.org > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
