The right scope depends on the existing roof, its condition and what the proposed system requires. Removing the existing roof can reveal details that are otherwise hidden.
Ask what the proposed system requires and whether the existing roof can be assessed well enough for the scope being considered. Have the roofer explain the removal and disposal work included in each option.
If you're comparing replacement options, ask Dekoven Roofing for a written estimate for your property.
Tear-off means removing existing roofing down to the deck before installing new materials. An overlay installs new roofing over what is already there. Which is appropriate depends on the roof.
Removing old roofing lets the crew inspect and repair the deck, replace flashing and install new underlayment on a clean surface. Details that cannot be seen on an old roof become visible.
Ask why the roofer recommends one approach, what the manufacturer requires and how it may affect warranty terms. Ask what is found or hidden in each case.
It can lower removal costs, but it may hide problems. Compare scope and long-term value.
It can. Ask what the manufacturer requires.
That depends on local code. Ask the roofer.
Related: Request a replacement estimate
Practical roofing guidance for property owners and managers in Milwaukee, southeastern Wisconsin and Houston.