Decking supports the roof assembly. Underlayment forms a secondary layer beneath the visible roofing material. Their condition matters even though they cannot be seen from the street.
Flashing manages vulnerable transitions around walls, chimneys, and other penetrations. Drainage directs water away from the roof and the building.
Ventilation is part of a broader moisture and temperature strategy. The right design depends on the building assembly, so individual components should be evaluated together.
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