Substrate, Framing, and Sheathing Verification
Why Substrate Verification Comes First
EIFS performance depends on a stable, flat, continuous substrate. Before any board goes up, the inspector verifies framing spacing and alignment, sheathing type and thickness, fastener schedule, and the absence of gaps or damage. Common sheathing substrates include exterior gypsum, oriented strand board, plywood, and cement board; each has manufacturer limits on span, fastener type, and treatment of joints.
What to Check and Record
Confirm that stud spacing matches the specified maximum, that framing is straight and plumb enough to meet flatness tolerances, and that sheathing joints are properly supported and gapped per specification. Check that fasteners are the specified type, length, and spacing, and that they are driven flush without breaking the facing. Verify that penetrations, transitions, and dissimilar materials are addressed before cladding. Note any deviation in writing with location and photographs.
Traps
A frequent trap is confusing substrate flatness tolerance with framing tolerance; the two are different criteria. Another is accepting sheathing that has been wetted and dried without checking for swelling, delamination, or fastener pull-through. Questions may ask whether a gap at a sheathing joint is acceptable: it depends on the specified gap and whether the joint falls over framing.
Worked Example
If the specification requires framing at 16 inches on center with sheathing joints backed by framing, and a field check finds a joint falling between studs, the correct response is to require blocking or refastening, not to caulk the joint. Document the location, photograph it, and re-inspect after correction.
Practical Rule
Measure, do not eyeball: use a straightedge and tape at multiple points, and record actual dimensions against the specification rather than a pass/fail note alone.