Manufacturers have historically furnished all components that make up the roof covering for which they will be responsible going forward under the terms of the roof-system warranty.
Commercial roofing manufacturers routinely seek out ways to differentiate themselves from the competition, separating themselves with products, services, specifications and warranties. They do not just sell mopping felts, base sheets or sheet membranes in rolls: They sell “complete membrane roofing and insulation systems.”
That has been good for our industry as well as our building-owner customers.