Jimmy,
I would assume that there is no engineer to throw this question back
on. I have looked at some similar situations and have used a couple
of approaches:
First, I try to get them to fill the space with insulation, thus
eliminating the need for sprinklers.
Next I try to take a practical approach and see what it would take to
flood the space and get coverage. The typical spacing rules are
probably out the window, because you physically can't meet all on
them. I don't know how long this space is, but it sounds similar to
the canopies on strip malls. I tend to keep the deflector distance
and distance from the peak within code, make sure the single
sprinkler can get water to the entire cross-section of the space and
shrink the sprinkler spacing (8-10 ft instead of 12-14). If a single
sprinkler goes off in this space, it is probably going to flood it in
a matter of seconds.
The previous being said, each situation has to be looked at
individually and what works in one might not in another. You'll have
to spend some time trying to figure out what is going to happen.
(yes, that is a disclaimer) It would be also good to talk with the
AHJ about it. You want to make sure he is on board.
Todd
At 11:38 AM 11/4/2008, you wrote:
Dear Forum Members, We are working on a retrofit for a church. The
building is entirely wood construction, built with large glu-lams and 14"
composite trusses (parallel to the glu-lams). We are protecting a small
cold space above a balcony. The roof pitch is 12 in 12, and the cold space
dies into a full height wall. So the space is a right triangle (with the
slope being the hypotenuse), instead of a typical attic and a typical peak.
8.6.4.1.4.2 (07) says I have to have a head within 12" of the bottom of the
top chord (TJI). First, does this rule still apply when I don't have a two
slopes to protect? Secondly, if this rules does apply, I'd have to add a
second line (in a very small space) and I couldn't maintain 6 feet between
heads, while still being more than 5 feet from the eave? Please help.
Thanks
Jimmy Waite
Burtell Fire Protection
406-652-7697
[EMAIL PROTECTED]
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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