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Common penetration flashing problems are:
- The failure to properly design the flashing for the penetration.
- Open or broken seams in metal curbs caused by expansion and contraction.
- Standing water behind penetration curbs caused by the omission of crickets.
- Sagging or separating base flashings caused by omission of top wood nailers.
- Missing or deteriorated counter flashing.
- Splitting or separation of the felt stripping over the edge of metal flanges.
- Improper priming and stripping of metal surfaces.
- Fastener backout and separation of the metal flashing flange from the roof around penetration flashings.
- Movement between stack vents or pipes and the flashing.
The following are potential problems that may decrease the life cycle of the roof system:
- Blisters and/or large areas of nonadhered membrane
- Open laps, excessive wrinkles, fishmouth
- Splits, ridges
- Fastener backout or pop up against or through the membrane
- Worn spots (deteriorated areas or holes in the membrane)
- Differences in firmness of the insulation or substrate
- Displacement of granules exposing the membrane
- Lack of or deteriorated surface coating
- Delamination of foil surfacing
- Degradation caused by lack of drainage
- Damage by equipment support
- Punctures
- Hail damage
- Wind damage
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