Sloping should be considered if the existing structure causes the roof to pond for a prolonged period of time. A general rule of thumb is that if the water evaporates within 72 hours this is generally acceptable. If ponding occurs for a prolonged period of time, and extra drainage cannot be added, then the extra cost for sloping a roof should be considered. In order for certain flat roofing systems to meet manufacturer’s extended warranties sloping is a must. Check with your particular material manufacturer if you have any doubts.
Insulation should be changed or upgraded if it is wet, does not meet existing building codes for the area, or if the existing insulation is damaging the structure (rusting metal decking, etc.). It also increases savings on utility bills.
I’ve received five estimates, all suggesting different work to be done and all completely different price ranges. Help?
Hire a roofing consultant who will assess the estimates, get a specific scope of work and research the company you are considering. Download our “How to evaluate your flat roof estimate?” guide to help make your choice easier.
My neighbour works for a roofing business and does roof repairs and installation by himself in his spare time. Should I enlist his services?
It is very important to have a written contract documenting scope of work, start and end date, liabilities and warranties. Check if your neighbour can provide you with adequate references, licenses, all the necessary paperwork and will accept a cheque or credit card payment.