Commercial Roofing FAQ - Burlington, ON

How long does a typical commercial roof installation take?

Installation timelines vary significantly based on roof size, system type, and weather conditions. A standard 10,000 square foot TPO or EPDM installation typically takes 3-7 days, while modified bitumen systems may require 5-10 days depending on the number of plies. Built-up roofing (BUR) systems often take longer due to the multiple layers involved.

Burlington's weather patterns play a crucial role in scheduling. We avoid installations during freeze-thaw periods in early spring and late fall when adhesive performance can be compromised. Winter installations are possible with certain systems but require special considerations and may extend timelines.

What permits are required for commercial roof replacement?

Commercial roofing projects in Burlington generally require building permits, especially for complete tear-offs and replacements. The permitting process ensures compliance with Ontario Building Code requirements and local regulations. Your roofing contractor should handle permit applications, including structural drawings and specifications.

Re-roofing projects that add a second layer may have different requirements than full replacements. Most jurisdictions limit the number of roof layers allowed, typically to two or three maximum. We always verify existing conditions and applicable codes before recommending overlay versus tear-off approaches.

What's the difference between TPO, EPDM, and PVC roofing membranes?

These three single-ply membrane systems dominate the commercial roofing market, each with distinct characteristics:

• TPO (Thermoplastic Polyolefin): Heat-welded seams create watertight bonds, white reflective surface reduces cooling costs, excellent performance in freeze-thaw conditions common to our climate
• EPDM (Ethylene Propylene Diene Monomer): Rubber membrane with proven 30+ year track record, more affordable initial cost, seams are typically adhered or taped rather than welded
• PVC (Polyvinyl Chloride): Superior chemical resistance for facilities with exhaust vents or grease, hot-air welded seams, higher cost but exceptional durability

Each system performs well in Ontario's climate when properly installed. Your choice depends on building use, budget, and long-term maintenance plans.

How does ponding water affect commercial flat roofs?

Ponding water—defined as water remaining on the roof 48 hours after precipitation—accelerates membrane degradation and increases the risk of leaks. While modern membranes like TPO and EPDM are designed to withstand some ponding, chronic standing water shortens roof lifespan by promoting UV deterioration and stressing seams.

Proper drainage design is critical. We evaluate roof slope (minimum 1/4 inch per foot recommended), scupper and drain placement, and potential settlements. In Burlington's winter climate, ponding areas become ice accumulation zones, adding structural load and freeze-thaw stress. Addressing drainage issues during installation prevents costly problems later.

Should I repair or replace my commercial roof?

This decision depends on roof age, overall condition, extent of damage, and budget constraints. If your roof is under 10 years old with localized damage, targeted repairs usually make sense. Roofs between 15-20 years with multiple leak points or widespread membrane deterioration often benefit more from replacement.

A professional roof assessment examines membrane condition, insulation integrity, fastener pull-out, and deck condition. We use infrared scanning to detect trapped moisture in insulation—a common issue that may not be visible from the surface but indicates more extensive problems.

Consider total cost of ownership: repeated repairs add up quickly and provide no warranty extension, while replacement offers 10-20 year warranties and improved energy efficiency through updated insulation.