A.John Edgar, senior technical services manager at Sto Corp., a manufacturer of EIFS systems, responds: To fasten something light to an EIFS wall, you will need screws or lag bolts long enough to reach through the rigid foam to the sheathing or framing. You’ll also need a PVC sleeve (plastic tubing or conduit) with an interior diameter a little larger than the fastener. The sleeve allows the installer to tighten a screw against a solid object without crushing the EIFS.

Fastening an object through EIFS will be easier if the sheathing under the foam is plywood rather than gypsum. If the sheathing is plywood, use the following procedure: 1. Mark the location of the fastener on the finish. 2. Drill a hole through the EIFS up to — not through — the sheathing. 3. Line the hole with a neutral-cure caulk. (If the...

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