In category Construction-trades All Search Filters PW McCALLUM ROOFING Metal and Flat roofers needed. PW McCallum Roofing is looking for Sub-contractors. Looking for experience in Flat Roofing, Metal Roofing as well as Asphalt Shingles. PW McCallum roofing works from Victoria to Nanaimo. We are a busy company with great rates for the right experience. Truck and tools nessesary