Wood joist is defined as ONLY SOLID members but to emphasis it the
word solid was repeated in (4.b). The annex points that aspect out
but poses an interesting question on glue-lam's. The composite does
say "I" cross section. The thinner web has been flagged as a known
parameter of concern. The greater burning characteristics are also
coming to light as a concern but that is the result of fire test with
composite joists.
I would argue that the "solid" is the primary variable since the
stated concern is the rapid burn-through for thin webs.
The Glu-lam's I'm familiar with use 2xs glued together. What other
assembly types are out there?
Roland
On Mar 29, 2007, at 1:43 PM, Thom McMahon wrote:
Roland:
For the purposes of clarifying 13, 2002, 11.2.3.1.8 (4.b) would
Micro lambs or LVL's (Composite solid wood joist) be classified as
"Solid Wood Joist" or do they contain too much Glue and Resin?
These are typically 1-3/4" x 9 or 11-7/8" or 14" up to 24" The
objection to "Composite wood Joist" seems to be the thin web. These
composite joist don't have a web. Should we treat them the same as
normal solid wood joist? Has the committee discussed these?
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message ----- From: "Roland Huggins"
<[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, March 29, 2007 12:42 PM
Subject: Re: Gyp Board to Bottom of TJI
I am assuming that the channels open to the adjacent concealed
space that is protected - right? So we are dealing with
unprotected channels over the 800 sf area. Since the objective of
the 3,000 sf RA is to account for fire breaking out of a
unprotected concealed space in more than one location, the
surrounding protected space should enter the fray right away.
The problem is running down a channel between heads with a lot of
energy from the unprotected area. A water curtain around the
area would reduce the concern somewhat. What say yea AHJ's?
Why not fill the channels with insulation? If the gyp is not
DIRECTLY attached to the bottom chord (no C-channel between chord
and gyp), then you have to have at least 3-1/2 inches of
insulation anyways.
Roland
On Mar 29, 2007, at 9:27 AM, Travis Mack wrote:
I have a project that is a small bank. In the center of the
bank, there is
a raised area (20' ceiling; the rest is 9' ceilings). In this
raised area,
there is gyp board directly to the bottom of TJI construction.
The rest of
the building has a dropped ceiling so there will be heads in the
concealed
space. This raised area is slightly less than 800 sq ft. Do I
need to
calculate a full 3000 sq ft in this project for the raised area?
T-Mack
Examine yourselves to see if your faith is genuine. Test
yourselves. Surely
you know that Jesus Christ is among you; if not, you have failed
the test of
genuine faith. 2 Corinthians 13:5 NLT
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