Signs the roof deck may need replacement
Soft movement under foot, sagging between framing, dark water damage, delamination, broken edges, repeated fastener pullout, and visible holes can point to failed sheathing. Interior stains and wet insulation add context, but an old dry mark does not automatically mean the panel has lost strength.
Leaks around chimneys, valleys, pipe boots, skylights, and eaves can damage a contained deck area over time. Widespread moisture from poor ventilation, repeated roof failure, or a long-open building can affect many panels. The repair boundary follows sound material and proper framing support rather than the outline of a ceiling stain.
Older plank decks may have gaps, splits, or irregular boards that do not provide the fastening surface required by a new roofing system. The planks may be locally repaired, overlaid, or addressed another approved way after spacing, condition, code, and manufacturer needs are reviewed.
Soft or deflected area
Movement may show lost panel strength, damaged edges, or framing concerns beneath the surface.
Water deterioration
Swelling, delamination, crumbling wood, rust, or dark wet areas can change the repair boundary.
Fastening problem
A deck that will not hold approved fasteners cannot support the selected roof as intended.
Unsuitable layout
Large plank gaps, unsupported seams, and irregular transitions may need preparation before reroofing.

