Roof Decking
The structural base layer of a roof, typically plywood or OSB, attached to the rafters or trusses. Everything else - underlayment, shingles - sits on top of the decking.
The structural base layer of a roof, typically plywood or OSB, attached to the rafters or trusses. Everything else - underlayment, shingles - sits on top of the decking.
Why Roof Decking Matters for Insurance Claims
Roof decking is the structural foundation of the entire roofing system. When the decking is compromised, shingles cannot be properly nailed and the roof loses its structural integrity. Decking damage is frequently discovered during tear-off, making it one of the most common supplement items in insurance restoration. Contractors should photograph all damaged decking during the tear-off process and submit a supplement with measurements before installing new decking.
Roof Decking in Xactimate Estimates
Decking replacement has its own line items in Xactimate under the RFG trade category. The estimate should specify whether the decking is plywood or OSB, as they have different selector codes and pricing. Measurements are in square feet or by sheet count. Include both the removal of damaged decking and the installation of new material as separate line items. If only a few sheets need replacement, the estimate should reflect the actual quantity, not the full roof area.
Identifying Decking Damage
From the exterior, soft spots when walking the roof, visible sagging between rafters, and water stains on attic-side surfaces are signs of decking damage. From inside the attic, look for discoloration, delamination, and mold growth on the underside of the decking. During tear-off, probe any discolored or soft areas with a screwdriver to confirm whether replacement is needed. All findings should be documented with photos for the supplement file.
Frequently asked questions
Roof decking is replaced when it is water-damaged, rotted, delaminated, or structurally compromised. During a tear-off, the contractor should inspect the decking and document any damaged areas. Decking replacement is a common supplement item because damage is not visible until the old roof is removed.
Decking is measured in square feet or sheets (4x8) in Xactimate. The line item includes both the material (plywood or OSB) and the labor to install. The replacement type should match the existing decking unless a code upgrade requires a change.
Yes, if the decking damage was caused by a covered peril. Water damage from a storm-related roof leak that deteriorated the decking is covered. However, decking that was already rotted from deferred maintenance may be excluded or partially depreciated.
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