2009 Roof Estimate
You never want the term "as needed" in any specification or contract. If you have a chimney, it needs it. The key is to do it correctly.
You must have a clause that states the roof will be kept in a water tight condition during the course of the contract, and any damage resulting from moisture intrusion will be borne by the contractor.
You should have a unit price for replacement of decking in kind. If plywood the unit price should be for minimum 4 x 4 and span three supports.
Ice dams material must extend 2 feet inside the homes exterior wall line at the eaves. The valleys should have a full sheet centered on the valley.
The exact make and model of ridge vent should be included.
Nailing pattern for high wind areas and warranty for same should be stipulated.
Time of construction should be stipulated. Be reasonable here, but a week is enough for most homes.
Specify protection of shrubs driveway etc, and specify any flat tires caused by roofing nails is on the contractor. Spec magnetic bar in clean up.
The products should be from a single manufacturer, or as warranted by a single manufacturer.
The shingles should be AR (Algae Resistant)
The felt should be ASTM D-226 Type 1
I like Certainteed Landmark, but there are quite a few good ones nowadays.
" A lot of men build things, and a lot of things fall down "