“If you are asked to sign a certificate of completion, do not do so until all the work is completely finished, the site is cleaned up, and you are satisfied.”
— Office of the Attorney General of Texas, “How to Avoid Home Improvement Scams”
A roof replacement is a sequence of coordinated steps, not simply a day of shingle installation. The process usually begins with a written scope and material selection, followed by site preparation, removal of existing materials where included, inspection of the exposed deck, installation of the roof system, cleanup, and final review. The exact sequence and duration depend on roof complexity, weather, access, and any concealed conditions.
Before work begins
Confirm material selections, scope boundaries, payment schedule, attic access needs, landscape protection, parking and driveway use, debris handling, and how change orders will be approved. Homeowners should remove fragile items from walls or shelves if construction vibration is a concern and ensure pets have a calm, secure place away from the work zone.
The deck inspection moment
Once old material is removed, the contractor can see conditions that were hidden. A written contract should explain how deck repairs are authorized and priced. Ask for photographs and a clear explanation before approving additional work. This is not an inconvenience to skip; a sound surface is important for installing the new roofing layers correctly.
System details deserve attention
An organized scope identifies components such as roof deck protection, starter strips, shingles, flashing, ventilation, and ridge caps where applicable. Product documentation may specify which accessories are required for certain warranty terms. Keep the final material documentation and installer paperwork with the home's records.
Closeout is part of quality control
Walk the property with the contractor, review the completed scope, collect warranty and permit records if relevant, and confirm that debris and nails have been addressed. If an insurance claim is involved, retain the invoice, completion evidence, and any documents requested by the insurer. Do not sign a completion statement until the work is complete and you understand what it represents.
Sources and further reading
Original sources are provided so you can review the complete guidance in context.
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