I saw this note in a house design drawing: girder truss + 2x10 top & bottom chord. What does the note mean, does it mean "provide a girder truss and add 2x10 to top & bottom chord"? What is the purpose of adding 2x10? What is the requirement of nailing?
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Girder truss + 2x10 top & bottom chord
- Thread starter sunyaer
- Start date
bill1952
SAWHORSE
I wonder if he thought or used term girder truss meaning steel, and the 2x10s were for nailing joists, etc , to? Assume 2x10s attached to chords (flanges) with carriage bolts or similar.
wood roof truss
bill1952
SAWHORSE
You have a mystery.
Not seeing the drawings, could it be horizontal - flat - on top and bottom of truss girder for lateral bracing?
Not seeing the drawings, could it be horizontal - flat - on top and bottom of truss girder for lateral bracing?
Yes, flat roof. Girder trusses are hanging trusses in perpendicular direction. And the drawing indicates girder trusses are pre-engineered and pre-manufactured. Would the added 2x10 are being used to provide hanging points?
bill1952
SAWHORSE
So the 2x10s could be flat for mounting hangers for rafters or jousts perpendicular to the girder truss? Bottom so maybe box it in.
Inspector Gadget
Registered User
Look at the truss detail. That will answer your question.
There is no truss detail. The engineer of record calls for pre-engineered truss on his drawings.
bill1952
SAWHORSE
You have any truss fabricators you're friendly with and can call and ask? I'll bet they know what's being asked for.
Inspector Gadget
Registered User
If there is no detail, how can anyone determine if it's been properly installed (ie: braced)?
tmurray
SAWHORSE
What is the purpose of the 2x10? I have no idea. I have never seen a 2x10 added to a girder truss. The only reason I can think of to add one would be to decrease deflection in the girder, but an easier (and likely cheaper) was to accomplish this would be to decrease the acceptable deflection of the member in the design software.
What is the nailing requirement? Structurally, the girder truss meets all the requirements, the 2x10 is just extra lumber. Unless it is supporting a load of its own, there is no nailing requirements.
What is the nailing requirement? Structurally, the girder truss meets all the requirements, the 2x10 is just extra lumber. Unless it is supporting a load of its own, there is no nailing requirements.
steveray
SAWHORSE
I was thinking the "ledger"...
The engineer or architect of record needs to explain his/her drawings, by providing more information, IMHO.
Mac Moonfire
SAWHORSE
I have called the truss manufacturer before, and the in-house engineer has been very helpful.
Never seen a 2x10. Sometimes I see 2x6 or plywood to be added, these are fixes for damaged trusses.
Let us know what you find, i'm curious now.
The designer explained that the intent is to use 2x10 top and bottom chord. The "+" sign is very confusing.
bill1952
SAWHORSE
To put hangers on it?
Mac Moonfire
SAWHORSE
go again?
So, in reading, the (+) is meaning (with). i.e. girder truss
tmurray
SAWHORSE
OK. That makes more sense. Very unclear the way it is written though.