How to inspect EIFS and stucco

Step by step

1. 1

   Verify the WRB, flashing, and drainage plane first

   Before any board or lath, confirm the water-resistive barrier is continuous and shingle-lapped, that all flashings and the drainage cavity or grooved board are in place, and that transitions at openings and terminations are detailed per the manufacturer. This is the wall's real waterproofing — the finish is just the face.

2. 2

   Confirm the mock-up sets the standard

   Where a mock-up was built, use it as the accepted benchmark for color, texture, joint layout, and detailing. Field workmanship and the finish should match what the mock-up established before the crew scales up.

3. 3

   Check board or lath attachment

   For EIFS, verify insulation board type, thickness, adhesive or mechanical attachment, and tight-butted joints rasped flush. For stucco, confirm lath type, fastener spacing and embedment, laps, and that the lath is furred off the substrate so the scratch coat keys behind it.

4. 4

   Inspect base coat, mesh, and embedment

   Confirm the base coat thickness and that reinforcing mesh is fully embedded — no dry, exposed, or wrinkled mesh — with the heavier or double mesh where impact resistance is specified. Mesh floating on the surface instead of embedded gives no reinforcement.

5. 5

   Verify control, expansion, and terminations

   Check that control and expansion joints, casing beads, and weep screeds are located per the details and the drawings, and that the system terminates above grade and at penetrations the way the manufacturer requires. A stucco run with no joints or a weep screed buried below grade will crack and wick.

6. 6

   Confirm finish coat and thickness

   Verify the finish coat is the specified product, color, and texture, applied at the right thickness and cured or protected against weather during application. Watch for cold-joint lines, mottling, and pattern changes where crews or batches changed mid-wall.

7. 7

   Check sealant joints at penetrations and transitions

   Confirm sealant joints at windows, penetrations, and dissimilar-material transitions have backer rod, correct joint dimension, and the right sealant for the substrate. The finish is not a sealant — every joint and penetration needs its own detailed seal.

8. 8

   Document the concealed layers before cover

   Photograph the WRB, flashings, board or lath attachment, and mesh embedment before each is covered by the next coat, and log any reverse lap, missed flashing, or dry mesh as a nonconformance to correct before it disappears under the finish.

Questions people ask

Why does EIFS get a bad reputation for leaks?

Early barrier EIFS had no way to drain water that got past the finish, so any breach trapped moisture in the wall. Drainable EIFS adds a cavity and a proper WRB and flashing behind the board — but only if it's installed that way, which is exactly what the pre-cover inspection is checking.

What's the difference between three-coat stucco and one-coat systems?

Traditional three-coat is scratch, brown, and finish over lath; one-coat systems combine the base coats into a single thinner application over board or lath. Inspect each against its own manufacturer's thickness, cure, and joint requirements rather than assuming they're the same.