REPAIR OF PLASTIC "T" JOINT

1. Plastic zip-strips as control joints are common in many parts of the U.S., but they can cause spalling, as shown.

2. Saw cut both spalled edges and joint. Cuts should be 1/2" deep minimum.
(3/4" min. is preferable).

3. Remove concrete laitance, zip strip and debris.

Overfill resulting joint with MM-80 and grind flush to floor level.

Note:If joint width exceeds 1/2" modify MM-80 with 2 1/2 parts of silica sand.