Compare panels with a membrane system
A metal proposal should name the panel profile, seam and fastening arrangement. A TPO proposal should name the membrane and attachment method. For either option, include the roof deck, insulation, edges, drainage and equipment penetrations in the design; the exposed covering is only part of the work.
Check the details for the actual roof
- Is the selected product suitable for the measured slope and supporting construction?
- How will drains, gutters, roof edges and equipment curbs be handled?
- What insulation and condensation-control approach is included?
- How will the new roof meet walls or a different roof system?
- How will maintenance staff reach equipment?
Compare the complete installed proposal
Include removal or preparation, repairs, accessories, access and maintenance requirements. Read the proposed warranty documents for each assembly. A generic metal-versus-TPO price or lifespan claim does not establish which system fits the building or what a particular warranty covers.