Local repair
A defined split or lap defect can be repaired when adjacent sheets and supporting layers remain suitable.

A modified-bitumen roof depends on its reinforced sheets, bonded laps and transitions working as an assembly.
Modified-bitumen roofing uses reinforced asphalt sheets, with a surfacing and application method specific to the product. Open laps, splits and failures at a curb or perimeter interrupt that assembly. Repair begins by identifying the existing material and how new work can bond to it, including the condition of the substrate beneath.

The installed roof and building conditions guide the choice.
A defined split or lap defect can be repaired when adjacent sheets and supporting layers remain suitable.
A compatible coating or restoration system needs a prepared, dry and sound roof. It does not remove wet layers.
Deteriorated sheets, wet insulation or failing support can require removal and renewal of the affected assembly.
The application method and hidden layers change the work.
The selected system must suit the deck and substrate. Manufacturer-approved preparation and application control the installation.
Application methods have different jobsite requirements. Occupancy, equipment and access need to be considered in selecting the method.
Drains, scuppers and details at changes of plane need to work with the new sheets. Surface treatment cannot correct a poorly draining assembly by itself.
No. Products and systems use different application methods. The selected assembly and manufacturer’s instructions determine the method.
The cause and condition underneath need assessment. Trapped moisture or poorly bonded material can make a surface patch an incomplete repair.

Start with the building address and the roof concern affecting the property.