Frequently Asked Questions
Q: How often should I be inspecting my roof and how much should this cost?
Q: How often should an IR scan be carried out and how much should it cost?
A: An infrared roof scan should be carried out at least once every three to four years depending on age of the building. Buildings less than 15 years can be scanned every three to four years. Older buildings should be scanned every 2nd year or if leaks are occurring more frequently. IR scans of roofs start at $1500 for up to 40,000 sq. ft. and generally, cost $0.02 to $0.03 cent per sq. ft. after 40,000 sq. ft.
Q: How should I decide whether to continue to repair my roof or replace it?
Q: How does a roof consultant decide on the type of construction to be used on my roof?
Q: I understand that phenolic insulation can corrode my deck. If this is true, how do I know if I have a problem? Do I have to replace this roof now?
Q: All of the contractors I talk with speak about Factory Mutual wind requirements. What does this mean and how do I contact them if I am not sure?
Q: What R value do I need on my roof?
Q: When do I need a vapour retarder?
Q: How much should a roof replacement cost?
|Flat BUR 1 – 5 stories high, R 20 – retrofit||$ 7.50 – $ 9.00 per sq. ft.|
|Flat BUR glass felts for above||$ 8.00 per sq. ft. – $ 9.50 per sq. ft.|
|Add for every 10 stories above 5 stories||$ 2.00 per sq. ft.|
|Two ply modified bur roofing…||$ 8.50 -$ 9.50 per sq. ft.|
|Inverted roofing add||$ 2.00 per sq. ft.|
|PVC roofing loose laid and ballasted – 1 – 5 stores…||$ 7.00 per sq. ft.|
|PVC mechanically fastened…||$ 9.50 per sq. ft.|
|EPDM loose laid ballasted…||$ 8.00 per sq. ft.|
|Retrofit over top existing…||$ 4.75 per sq. ft. for buildings less than 4 stories|
|Add if building has many roof projections||$ 2.00 per sq. ft.|
|Add if building has access problems for construction||$ 1.50 per sq. ft.|
|Add if roof is to be done in winter or in peak of summer||$ 2.00 per sq. ft.|
|Add if union roofing contractors required||$ 1.50 per sq. ft.|
|Add if roof is less than 1000 sq. ft. in size||$ 5.00 per sq. ft.|
Cost to replace an 20 storey apartment building, 14,000 sq. ft. in size in November, downtown Toronto with poor access. Consultant has selected two ply modified inverted roofing R value 20.
Cost = $ 8.50 per sq. ft. + $ 2.00 for inverted + $ 1.50 for access + $ 2.00 for winter + $ 2.25 for height = $ 16.25 per sq. ft.
Total Cost = $ 227,500 + engineering + G.S.T. + contingency allowance.