Water Management Starts With the Right Roof System
Professional flat and low-slope roofing installation for Ontario homes, additions, garages, porches and commercial properties—with project-specific planning for drainage, flashing, penetrations and the complete roof assembly.
The Roof Still Needs a Path for Water
A roof may look flat from the ground, but successful low-slope roofing depends on controlled drainage. Water must move toward designed drains, scuppers, gutters or roof edges without being trapped by poor slope, blocked outlets or incorrect transitions.
ROOFNOW™ reviews the roof as a complete assembly. The estimate considers existing materials, deck condition, slope, drainage, insulation, vapour control, perimeter details, walls, penetrations, access and how the low-slope area connects to adjoining roofs.
The suitable membrane and installation method depend on the actual property and current manufacturer requirements.
Get My Low-Slope Roof EstimateLow-Slope Roofing for Homes and Commercial Buildings
Different properties require different access, drainage, insulation and membrane details.
Home Additions
Low-slope additions require careful wall transitions, drainage and connection to the main roof.
Porches & Carports
Small roof areas still need a compatible membrane, sound deck, edge details and reliable water flow.
Garages & Outbuildings
Review roof deck, perimeter flashing, drainage direction and transitions to adjoining construction.
Commercial Properties
Plan around occupied spaces, rooftop equipment, service access, drainage and operating schedules.
Mixed-Slope Buildings
Steep and low-slope roof sections need compatible transition details and coordinated water management.
New Construction
Early coordination helps align decking, insulation, drainage, penetrations and the selected membrane system.
Self-Adhering Modified-Bitumen Options
The following systems illustrate low-slope roofing options. Final suitability depends on the roof, substrate, slope, local requirements and current manufacturer instructions.
Flintlastic® SA
A self-adhering SBS modified-bitumen roofing system designed for suitable low-slope applications when installed according to the specified system and current instructions.
Base, Ply & Cap Planning
Low-slope performance depends on the specified assembly, including approved substrate preparation, base or ply layers, cap sheet and detail work.
LIBERTY™ SBS
A self-adhering SBS roofing system intended for suitable low-slope residential roof areas such as porches, garages, carports and sheds.
Granulated Cap Sheet
The cap sheet forms the exposed weathering surface and must be integrated with edges, laps, flashing and penetrations according to the complete system requirements.
Every Edge, Drain and Penetration Matters
Flat-roof performance is shaped by much more than the field membrane. Water often concentrates around roof edges, drains, walls, curbs, seams and penetrations.
A written proposal should identify the preparation and detail work included for the specific building.
Flat Roof Conditions Worth Investigating
These signs do not diagnose the roof, but they are useful details to include when requesting an estimate.
Standing Water
Water remaining after weather may point to drainage, slope or outlet conditions that should be reviewed.
Open Seams or Laps
Visible separation at seams, laps or edges should be documented as part of the roof assessment.
Cracks or Surface Wear
Age, weather and movement can affect the exposed membrane and protective surface.
Flashing Deterioration
Walls, parapets, curbs and penetrations are common areas where water-management details concentrate.
Interior Water Staining
Interior evidence should be reported with its location and timing, but the source requires inspection.
Repeated Service Calls
Recurring issues may justify reviewing the roof condition and longer-term replacement options.
From Property Details to a Written Scope
Project Information
Share the address, building type, existing roof, known concerns and expected timeline.
Roof & Drainage Review
Assess roof geometry, access, deck, slope, drainage, edges, walls and penetrations.
System Selection
Identify a suitable low-slope assembly based on the roof and current system requirements.
Written Estimate
Receive a project-specific proposal describing preparation, system and installation scope.
Clear Scope, Scheduling and Payment Options
Occupied-Building Coordination
Commercial and multi-unit projects may require planning around entrances, tenants, operating hours, deliveries and rooftop equipment access.
Discuss the property →Financing Options
ROOFNOW™ can explain available payment options for qualified applicants. Approval, limits and terms depend on the applicant and financing provider.
Explore financing →Common Low-Slope Roofing Questions
Is a flat roof completely flat?
It should have designed slope or drainage provisions that direct water toward drains, scuppers, gutters or roof edges. The correct approach depends on the building and roof assembly.
What is self-adhering modified-bitumen roofing?
It uses SBS modified-bitumen membranes manufactured with self-adhering components. The number of layers, substrate preparation, accessories and details depend on the specified system and current manufacturer instructions.
Where can GAF LIBERTY™ be used?
GAF describes LIBERTY™ SBS as a self-adhering system for suitable low-slope residential areas such as porches, garages, carports and sheds. Building-specific suitability still requires review.
What is CertainTeed Flintlastic® SA?
Flintlastic® SA is a self-adhering SBS modified-bitumen roofing system for suitable low-slope applications when specified and installed according to CertainTeed requirements.
How much does a flat roof cost?
Pricing depends on roof area, access, existing materials, removal, deck condition, drainage, insulation, flashing, penetrations and selected system. A property-specific review is required for an accurate estimate.
Does ROOFNOW™ sell flat roofing materials only?
No. ROOFNOW™ provides professionally installed roofing systems and does not offer materials-only sales.
Continue Planning Your Roofing Project
Tell Us About the Property
Provide the location, building type, current roof and known concerns. ROOFNOW™ will review the details and help determine the appropriate next step.
Professional installation across Ontario.
No materials-only sales.