Wood Diaphragm to Masonry Wall

[WillisV]

Trying to get an idea of what details people use to connect a wood diaphragm to the side of a masonry wall w/parapet. Any suggestions?

 

[COEngineeer]

They have simpson product to attach wood to hollow masonry. Look at their catalog.

Never, but never question engineer's judgment

 

[COEngineeer]

Attach 2x ledger to masonry either with Titen screws, or adhesive screw (with screen tube). Then you just use a top flange hangers and the plywood will go over the ledger. When you frame parallel to the masonry wall, put a ledger also and put blocking every 2 ft and the plywood should go over the ledger. Good luck.

Never, but never question engineer's judgment

 

[COEngineeer]

And I forgot to mention that the ledger should be treated.

Never, but never question engineer's judgment

 

[msquared48]

No cross grain bending allowed in the ledger.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[tadeng]

Agree with Mike, so use a strap (Simpson) to attach to blocking where the joists are parallel to the wall. Where they are perpendicular to the wall, strap to the joists.

 

[ronstruc]

COEngineer,
I understand why, but where does the code (IBC or referenced) require you to use a treated ledger. The only thing I have found is if the ground is within 8", than it needs to be treated (2304.11.2.2)

 

[msquared48]

Any time wood contacts concrete, then either PT or building paper is required. It is there.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[woodman88]

The use of preservative-treated wood is required per sections 1403.6 (2003 IBC) or 1403.5 (2009 IBC) and section 2304.11.

Garth Dreger PE
AZ Phoenix area

 

[tadeng]

Woodman,

The way I read 1403.6 that is only a requirement for buildings in flood hazard areas.

 

[woodman88]

tadeng, Yes that how I read it also. I was just pointing out all the requirements for PT lumber as I have found it in the IBC. Now some building departments are requiring PT lumber at ground floor sill plates at all exterior walls, some for all sill plates in contact will concrete. There have been talk also of requiring the first floor studs to be PT lumber due to termites.

Garth Dreger PE
AZ Phoenix area

 

[vandede427]

Where you joists are parallel to the wall, put solid blocking in at 16" to stiffen the deck between wall and first interior joist.