Where Ledger Meets Lath: Integrating a Deck into Stucco

March 3, 2016

 

There are a lot of ways to install a ledger board for a deck, and there are also a lot of ways to install one wrong

Integrating the ledger to a stucco clad wall is not complicated, but it is important for durability and ease of future maintenance. The stucco is likely to last significantly longer than the decking, make it easy to replace the decking without disrupting the stucco. Lap the layers correctly and install lath in such a way that it will hold the stucco forever.

 

The Layers:
  • #30 felt or peel and stick roofing membrane is installed behind where the ledger board will be.
  • Pressure treated ledger board is lag bolted into solid framing.
  • Z-flashing is installed over the ledger with seams caulked (with polyurethane caulk) or soldered.
  • Two layers of WRB (Fortifiber two-ply JumboTex, in this instance) installed over wall sheathing lapping over the Z-flashing.
  • Because a stucco weep screed needs to be at least 1/2 inch above the decking, it is important to know what type of decking will cover the deck framing.
  • Install the week screed with the WRB lapped over it.
  • Install wire lath—pushing the curve toward the wall makes it easier to handle. The wire mesh is firred, meaning that it is dimpled to provide 1/4 inch of relief so that stucco can ad hear to the back and the front of the mesh.
  • Staple the top corner, roll out the section and staple opposite top corner. 
  • Staple the lath into framing every 6 inches (vertically).

If you miss the stud with a staple, go back and staple it again. Gun staplers obviously make this a faster job.

 

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2012 IRC:  SECTION R703 EXTERIOR COVERING

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Kirk Giordano is a plaster and stucco contractor in the San Francisco Bay Area. His YouTube channel has a lot more videos

 


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