A modified-bitumen roofing project starts with an assembly that suits the building. Compare system options, installation details and replacement scope before deciding.
Understanding two-ply systems
The base sheet and cap sheet serve complementary roles. The cap sheet may have a granulated surface. Installation depends on the product: do not assume every system must be torch-applied.
Repairing the right details
An open seam, damaged flashing and wet insulation call for different responses. Reviewing the covering, substrate and connections helps determine whether a repair or replacement is appropriate. Repairs must be compatible with the existing membrane.
Comparing a complete proposal
Ask for exact products, attachment method, parapet work and site protection measures. Colour, local requirements and manufacturer instructions need to be checked for your property.
Points to assess
- Condition of the covering, seams and upstands
- Existing layers and damp areas requiring investigation
- System, installation method and connections