Rain catches the open roof. By breakfast, the owner has three photographs of dark plywood and two completely different opinions about it. One person says it must all be replaced. Another says the shingles will keep it dry from now on. Neither answer follows from colour alone. The deck needs a condition assessment and must be suitable for the layers about to cover it.
Brief wetting is not automatically permanent damage. Enclosing unsuitable wet material is not a drying plan either. The useful question is what the contractor found and what supports the decision to proceed.
Surface water and panel condition are different questions
A board can have water on its face without losing its usefulness. It can also appear dry at the top while moisture remains elsewhere in the assembly. Swollen edges, delamination, deterioration or inadequate support need their own evaluation.
APA's roof guidance calls for shingle underlayment over dry sheathing. IKO's roof-preparation guidance likewise identifies a clean, dry and flat base. These principles do not supply a universal number of sunny hours that makes every exposed roof ready.
The selected deck and roofing products matter. Ask which instructions govern acceptance and whether a particular adhesive or self-adhering layer has additional substrate requirements. A material's ability to tolerate some construction exposure does not mean it should be permanently enclosed in any condition.
A Dry Surface Is Only One Part of Readiness
The separated layers show why underlayment appearance cannot settle deck condition. Surface water, moisture within the wood, panel edges and structural condition require separate attention before covering. Use the selected products' requirements and an appropriate assessment; this drawing gives no universal moisture percentage or drying time.
Conceptual drawing. Product details, dimensions and attachment requirements are not shown.
Find the wet area on the roof plan
Was the whole deck rained on briefly, or did water collect repeatedly in one low area? Did an old leak wet the underside for months before tear-off? Was new material stored wet before delivery?
Those histories can lead to different inspections. Mike asks for the wider image. The first close-up is so tight that it could be a cupboard shelf. A photograph of the darkest spot may be useful, but its location and extent make it evidence about this roof. The contractor should identify where the wetting occurred rather than discussing the roof as one uniform sheet.
Include anything beneath the deck that affects inspection or drying: insulation, an existing membrane, a finished sloping ceiling or another retained layer. The roof covering is only one side of the decision.
A moisture reading needs a location and a method
If a meter is used, ask what material it was set for, where readings were taken and how the result will be judged. Different instruments and settings do not produce automatically interchangeable numbers. A reading without those details can look precise while answering very little.
Do not buy a meter and climb onto the deck to settle an argument. The crew or assessor should provide the evidence safely. A useful record identifies comparable locations and any areas that remain inaccessible.
APA's moisture guidance treats drying and moisture management as construction issues. Where readings or appearance remain uncertain, the appropriate response is a clearer assessment, not inventing a pass number from an unrelated material.
What would change the scope?
Dave marks two opened sections on the same roof plan after the shower. One is sound new sheathing that can be protected and allowed to dry appropriately. The other contains old softened material around a leaking stack and broken panel edges. "Same weather, different wood problem," Dave says. The rain is the same event; the underlying condition is not.
The first may need time and a documented acceptance check. The second may need replacement of unsuitable material and correction of the original water route. A contractor should explain that distinction before converting a drying delay into a whole-roof decking charge.
Use the decking change-order guide for quantity, support, photographs and approval. Replacement sheets need suitable installation too; buying new wood does not remove the need to check its condition.
Protect the roof while the decision is made
The contractor must manage temporary weather protection and the safe work sequence. Ask which areas can remain protected while others are assessed, and who responds if rain returns. Do not climb up to adjust covers or help the material dry.
A quoted exposure period for underlayment answers a different question from whether the deck was ready when it went down. Keep those records separate.
Before covering, request a short conclusion: affected area, findings, drying or repair performed, and the basis for acceptance. That record is far more useful than a reassuring photograph taken after everything has disappeared beneath a new roll.