Stucco News

Question and answers on Stucco and Plastering--

March, 2015


   Expanding on expansion joints.

 
a
No, this isn't a stucco
                          expansion joint. It is a drywall expansion
                          joint.
A picture from a reader in Florida:

No, this isn't a stucco expansion joint.
It is a drywall expansion joint.

It can still be used. The mortar would need to be struck off flush with the
inside edge of the joint.

A joint made for stucco
would leave a much nicer job.
The cracks on the edge are probably OK as long as the mortar bonded fine to the block.
The cracks will fill in with the brown coat.
Drywall expansion joint
Drywall expansion joint with an
1/8" flange.
Expansion joint for stucco with a
                          3/4" flange
Expansion joint for stucco with a 3/4"
flange
Note how the stucco expansion has larger holes for a good key for mortar. The mortar should
squish through nicely for a good bond to the block. Also, the raised flange has a nice casing for locking the mortar in place, and provides a neat, finished edge.On framing where metal lath is required, the joints should be put on first, overlapping the side flange with metal lath.