If you go with 2 grates to permit air flow, the temperature in the channel should be closer to the room side of the insulation than that on the other side of the insulation. I would be concerned if there were no grates. Make sure you don't use plastic piping, as otherwise there will be an additional restriction of having a head within 12 inches of the grates.
Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: June 24, 2011 8:15 AM To: [email protected] Subject: Channel in roof joists Sorry, forgot title At 10:09 AM 6/24/2011, you wrote: >I am working on a small mixed-use building with commercial space on the >first floor and an apartment with loft above. Part of the apartment has >a cathedral ceiling, which needs to have sprinklers on the slope. No >other options. The roof is framed with 2x10s and they plan to use a >spray in foam insulation the entire depth of the joists. My thought was >if they took one joist bay and only put 5" of insulation and create a >space to run the pipe. Would that be sufficient to prevent pipe from >freezing? I also thought about putting a small grate at the bottom and >top of the channel to allow heat to flow into the space. Has anyone >done anything like that before? Thoughts on weather it would work? Not >a lot of options and I don't want to go with an antifreeze system > >Todd G. Williams, PE >Fire Protection Design/Consulting >Stonington, CT >860.535.2080 >www.fpdc.com > >_______________________________________________ >Sprinklerforum mailing list >[email protected] >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > >For Technical Assistance, send an email to: [email protected] > >To Unsubscribe, send an email >to:[email protected] >(Put the word unsubscribe in the subject field) Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.com _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
