Roof Cement

The Roofer's All-Purpose Sealant

Roof cement is a thick, trowel-grade asphalt-based compound used to seal joints, bed flashing, seal pipe boots, and make emergency or permanent repairs at vulnerable points on a roof. It is one of the most basic and widely used products in roofing, applied with a trowel or caulking gun at flashings, penetrations, and any point where water could enter. When applied correctly in the right situations, roof cement provides a reliable seal. When overused as a substitute for proper repairs, it indicates a problem.

On insurance claims, excessive roof cement is often a sign of prior repairs or deferred maintenance that affects the scope.

Proper vs. Improper Use

Proper applications of roof cement include bedding step flashing behind siding, sealing the base of pipe boots, bonding counter flashing to masonry, and sealing small gaps at transitions. These are standard installation practices that are included in the labor component of most Xactimate roofing line items. Improper use includes covering large areas of damaged shingles, filling gaps caused by poor workmanship, or sealing around penetrations instead of installing proper flashing.

When inspecting a roof, note any areas with excessive roof cement application. These areas indicate prior issues and may reveal damage or deficiencies that are hidden beneath the sealant.

Roof Cement on Claims

If the existing roof has extensive roof cement repairs, document them thoroughly. Prior repairs do not necessarily disqualify a claim, but they provide context for the roof's condition. The adjuster will evaluate whether the current damage is new storm damage or a continuation of existing problems. Clear documentation of fresh damage distinct from old repairs helps the claim.