Shingle manufacturers and roofing contractors have earned their reputation - do your research before making your roofing decision.
Check with the Better Business Bureau;
ensure the contractor is covered by Work Safe B.C and that they have liability insurance; and
ask for references.
Existing shingles and all flashing should ALWAYS be replaced with new roofing if possible.
Roofing sub-contractors are not working for you; they are piece workers. A dependable roofing company have their own trained and hourly-paid employees who will typically provide better workmanship than a piece worker.
Ventilation is very important and extra vents are not expensive.
Only use well known and insured roofing companies to avoid potential roofing disasters.
Deposits should NEVER be paid or requested upon signing a roofing contract. PAYMENT should always be paid on completion of work.
It is highly recommended that least 3/8” sheathing be installed on top of shiplap decking to avoid deck movement, which void the manufacturer’s warranty.