A single-ply roof crew finds damp cover board after an overnight storm, but the adhesive window is closing. What should the superintendent require?
Correct Answer
C) Wait until the substrate meets the manufacturer's dry and clean condition before adhering membrane
Membrane adhesion over damp substrate can trap moisture and compromise bond; the substrate should meet the manufacturer's dry, clean installation requirements. Other choices hide moisture or omit required attachment.
Why This Is the Correct Answer
Membrane adhesion over damp substrate can trap moisture and compromise bond; the substrate should meet the manufacturer's dry, clean installation requirements. Other choices hide moisture or omit required attachment.
Why the Other Options Are Wrong
Option A: The superintendent should install the membrane and rely on sun heat to dry trapped moisture
The trap in A is Install the membrane and rely on sun heat to dry trapped moisture. That selection is wrong because it points to Install the membrane and rely on sun heat to dry trapped moisture, but.
Option B: The superintendent should broadcast dry cement over the board and proceed
Choice B gives Broadcast dry cement over the board and proceed. Its specific error: it answers the Roof substrate moisture prompt with the wrong practical move.
Option D: Fasten only the seams and skip field adhesion
In thermal and moisture protection, Fasten only the seams and skip field adhesion is the wrong selection for Roof substrate moisture: the option delays or omits the controlling step.
Memory Technique
Tag the scene with roof substrate moisture: wrong actor or wrong timing means the fix is not Wait until the substrate meets the manufacturer's dry and clean condition before adhering membrane.
Reference Hint
Open Roofing Construction and Estimating, Atcheson, 1995/2022 reprint; use the index entry or section for "Roof membrane substrate condition before installation" to confirm that Membrane adhesion over damp substrate can trap moisture and compromise bond; the substrate should meet the manufacturer's dry, clean installation requirements.
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