Bob:
If your using the Attic Specific application sprinklers from TYCO 16" to 22"
down is normal, and your 11" top cord is not as important as the distance
between trusses.
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "Bob Knight" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, June 21, 2007 10:59 AM
Subject: Wood Truss Construction
I have a situation in an attic space that is using a standard wood truss w/
2x6 top cords, but in addition to this there is another 2x6 sistered to
the
top cord so that the top cord is now 11" deep. Per 13, truss construction
is considered unobstructed, but I'm having a difficult time considering
this
unobstructed. This is a dry system. If this is unobstructed
construction,
then the deflector is to be 1" to 12" down which leaves only 1" of play
for
sloping the branch lines. At a 1/2" per 10' there is not enough play to
provide proper slopeage. Can this be considered obstructed construction
due
to the depth of the double top cord?
As a side question, I've never understood why a truss with 2x4 or 2x6 top
cord is considered unobstructed when a joist that is a 2x4 or 2x6 is
considered obstructed. What's the difference?
Thank you,
Bob Knight, CET
(208) 495-2057
[EMAIL PROTECTED]
www.firebyknight.com
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