Here is my detail for attaching a 2×10 ledger to syn-stucco for a pergola over a patio.
Make short stand-offs out of 2″ galv. pipe and holesaw 1/2″ deep pockets into the ledger board to accept the pipe. Bed the standoff in a bead of caulk to the ledger. Then lag the whole assembly through the center of the standoff into the rim joist or if I go a little higher into the studs. The standoff wil leave say an inch of space for drainage between the stucco and the ledger. I will go either 24″ or 32″ on center. Any thoughts on the sealing the standoff to stucco connection. Or, does anyone have a better detail they have used for attaching a ledger like this?
Thanks Gary
Replies
Don't the stand-offs crush the stucco? Especially if this is EIFS?
Skip the spacers. Attach directly to the EIFS with 8" lag bolts into the studs or band joist. Then seal the joint between the ledger and the EIFS with polyurethane caulk. PL is a good brand.
Ideally, you woud cut out the EIFS the outline of the ledger, and fit flashing up under the EIFS and over the joist. Then attach the joist as described above, escept with 6 or 7" lag bolts, depending on how thick the eifs that you removed was.
I could be wrong about this, but that's what I would do.
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Interesting solution.
I think it would work Ok as long as there is not a lot of loading on the lags. (shear or withdrawal)
The sealing of the standoffs is , as you said the issue. I might be tempted to drill a 1/4" oversize hole though the stucco and fill the entire hole with a sealant then push the standoff into that while the sealant is still wet. That would at least in my mind help keep water from wicking back around the standoff and getting behind the stucco. Then after it is all assembled I would caulk around the standoffs again.
Still not 100% certain that would do it though . I am always nervous about penetrating that stuff.