Low-Slope & Flat
Built-Up Roof (Tar & Gravel)
Top brand: Johns Manville
Installed cost
$5.90–$11.80
CAD per sq ft
Lifespan
20–30 yrs
manufacturer typical
Region
Lower Mainland
+18% CAD adjustment
Overview
Multiple plies of asphalt-saturated felt topped with mineral aggregate. The classic low-slope assembly. Heavy, but extremely puncture-resistant once cured.
Best for
Legacy commercial decks and traffic-tolerant flat roofs.
Live cost estimate
Estimate your Built-Up Roof (Tar & Gravel) roof
Lower Mainland installed pricing in CAD. Drag the slider to match your roof area.
500 sq ft8,000 sq ft
Low
$11,800
Typical
$17,700
High
$23,600
Range: $5.9 – $11.8 per sq ft installed. Includes tear-off, underlayment, flashing, and labour. Excludes permits, structural work and tax.