In Sharon's case the max 'detector' spacing will be 15x15.
I pointed her to 72 because it shows how to calculate spacing under
dome roofs.
Brad
Quoting "Prahl, Craig/GVL" <[email protected]>:
Sorry but I see no sprinkler correlation whatsoever with regard to
NFPA 72 heat detector spacing. Detectors have an entirely different
set of spacing and placement rules apart from sprinklers. Heat
detection devices mentioned within the NFPA 13/15 Standards are more
often referring to dry or wet pilot sprinklers used to trigger other
systems such as deluge or preaction systems. But while those are
actual sprinklers, even those have different spacing and location
rules than spray sprinklers. So, stay within the NFPA 13 spacing
rules for spray sprinklers.
My first step would be getting input from a structural engineer as
was stated previously. These types of structures may not
necessarily have been designed to sustain the point load of a water
filled sprinkler system and may require special hanging measures to
distribute the loads across multiple wood members. I also hope you
don't have to contend with seismic bracing but if you do, that also
should be guided by a structural engineer so you know how and where
to attach to the structure.
Then I'd look at Wood Joist construction and see how that fits with
the actual construction of the assembly. Also take a look at other
resources such as FM Global Data Sheets or XL GAPS protection data.
Sometimes when dealing with wonky construction such as this, the
insurers have more relevant data than NFPA.
Craig Prahl | Jacobs | Group Lead – Fire Protection | 864.676.5252 |
[email protected] | www.jacobs.com
-----Original Message-----
From: Sprinklerforum
<[email protected]> On Behalf Of Steve
Leyton
Sent: Tuesday, July 24, 2018 7:17 PM
To: [email protected]
Subject: [EXTERNAL] RE: Lamella Roof
So ... you're suggesting that sprinklers be ... spaced as detectors?
What's the "deflector" distance of a heat detector and how would
that translate to sprinklers on branch piping exactly? What the
hell are you even talking about? I get that sense Brad that, at
this point, you're just posting for the sake of seeing your words in
print because that's the 2nd-most ridiculous thing (after the Ghost
Ship comment) you've ever put up. Please, just stop.
Sharon - since it's framed of wood, I'd look at the criteria for
depth and on-center the spacing of the members. It's likely to end
up being (or closest) to Wood Joist Construction per A.3.7.1 (6) and
that section even includes criteria on the span. The honeycomb
elements will catch head just as solid wood or composite joist
members will; the honeycomb pockets look (in photos, I had to Google
"Lamella Roof") like the area and volume would be less than a TJI
channel typically is, so heat and combustion byproduct will log down
to the sprinklers pretty quickly. An unusual configuration by
today's standards but I'm not sure it has to be that complicated for
sprinkler locations.
Steve L.
-----Original Message-----
From: Sprinklerforum
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Tuesday, July 24, 2018 3:53 PM
To: [email protected]
Subject: Re: Lamella Roof
All I've got Sharon is to look at NFPA 72 spacing and position rules
for heat detectors for dome roofs, since the first responsibility of
a sprinkler is to be a heat detector, and 13 does not adress dome
roofs.
Brad
Quoting Sharon Alves <[email protected]>:
So, nothing extraordinary? I’m thinking wood joist criteria? I don’t
know yet how deep the wood is, but I’m thinking it is 12” deep.
On Jul 24, 2018, at 3:16 PM, Timothy Goins <[email protected]> wrote:
Years ago in Weslaco, Texas. We called them honeycomb roofs. They are
great and very sturdy and open, good for warehouses. First came here
during and after the great wars via a German engineer.
And I will give them one heart, and I will put a new spirit within
you; and I will take the stony heart out of their flesh, and will
give them an heart of flesh Eze 11:19
On Jul 24, 2018, at 4:58 PM, Sharon Alves
<[email protected]> wrote:
I have been asked to provide a design for a gymnasium retrofit.
The gymnasium has a lamella roof system. I have never seen this
before.
I was wondering if anyone in the forum has had experience with a
lamella roof.
--
Sharon Alves
[email protected]
530-205-7678
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