That's another reason to use the specific application heads which allow the
"sprinkler heads" to be 16" to 22" below the peak. and 6" offset from the
center line of the peak. You can use them up to 12/12, but if I had a
greater than 12/12 I'd still ask the AHJ if we could use them due to their
superior performance in wood attics. A better question is when does a roof
become a wall? 20/12? 40/12? or only when its perpendicular?
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "Fletcher, Ron" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, April 11, 2007 10:37 AM
Subject: RE: Unoccupied Attics pitch greater than 4 in12
Lets say you're a sprinkler scientist and strictly apply NFPA. If it is
not wood joist or wood truss do we have to use the spacing requirements
of within 12" of the peak and more than 6 ft. from the eave etc... ?
Regardless of the sprinkler type.
Ron Fletcher
Aero Automatic
Phoenix, AZ
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Thom
McMahon
Sent: Wednesday, April 11, 2007 9:19 AM
To: [email protected]
Subject: Re: Unoccupied Attics pitch greater than 4 in12
For the purposed of Attic protection I would use listed Attic Specific
application sprinklers. Wood trusses fail fast at the metal plates, and
composite wood joist fail in the thin flange between the stringers. In
this application, I don't think NFPA 13 cares what type of joist are
used, only if they are combustible or not.
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "Fletcher, Ron" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, April 11, 2007 8:40 AM
Subject: Unoccupied Attics pitch greater than 4 in12
8.6.2.2.1(a) 02 references "combustible wood joist or wood truss
construction". Most of the spacing requirements (i.e. 8.6.4.1.4.2 &
8.6.4.1.4.3) for slopes greater than 4 in 12 are prefaced by
"combustible concealed spaces of wood joist or wood truss construction".
What if the construction is 18" composite wood joists on 2 ft centers?
NFPA is pretty clear that composite wood joists are not the same as wood
joists.
Ron Fletcher
Aero Automatic
Phoenix, AZ
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