Shingles New Shingles Roof Required - What Does The Work Inlcude? What Items Should Be Includes In The Quote?

New shingles roof required - what does the work inlcude? what items should be includes in the quote? - shingles

I need a new roof - the insurer has) me (at the age of investment property. What was in the budget of the contractor will be taken? What is the establishment of a new roof tiles belong to? (ie there is a layer under the shingles to be replaced?, etc..) Thank you.