Tom, It doesn't always work that way. If the building mechanical systems are operating negatively and/or if the building enclosure is not tight or well sealed, cold air is drawn in through the grates you are installing, freezing the pipe above the grate. Be careful.
Scott Futrell (763) 425-1001 Office (612) 759-5556 Cell -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Friday, June 24, 2011 9:15 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)
