NDG Roofing & Renovation Contractor | Notre-Dame-de-Grâce
Serving Notre-Dame-de-Grâce and surrounding areas. Specialists in flat roof membrane replacement, aging brick buildings, and pre-war duplex and triplex renovation.
Flat Roof Specialists in NDG
Notre-Dame-de-Grâce is one of Montreal's most architecturally rich residential neighbourhoods — a patchwork of classic Montreal duplexes and triplexes built predominantly between 1900 and 1950, interspersed with single-family homes and larger apartment buildings. The overwhelming majority of residential buildings in NDG have flat or low-slope roofs, making elastomeric membrane roofing one of the most requested services in the area.
The standard flat roof system for NDG duplexes and triplexes is a 2-ply SBS modified bitumen membrane — typically SOPREMA Sopralene Flam or IKO SBS. These systems are torch-applied using controlled heat-welding to create fully bonded, seamless waterproof coverage across the roof deck. When properly installed with correct parapet wall detailing and drain servicing, they provide 25–30 years of reliable performance.
Aging Brick Facades
NDG's pre-war duplexes and triplexes are defined by their red brick facades — a characteristic that gives the neighbourhood its visual character but also its most persistent maintenance challenge. Brick mortar has a finite lifespan. As mortar joints deteriorate over 50–80 years, water begins infiltrating the wall assembly, causing freeze-thaw damage to bricks, interior moisture damage, and in severe cases, structural instability in the facade.
We assess brick facades during every exterior project and coordinate masonry repair work — tuckpointing, brick replacement, and parapet waterproofing — that addresses infiltration at the source. Combining a new membrane roof with properly detailed parapet waterproofing and any necessary masonry work provides comprehensive exterior moisture protection for NDG's older building stock.
Pre-War Unit Renovation
Kitchen and bathroom renovations in NDG pre-war buildings require specialized knowledge. Original plumbing systems — galvanized steel water supply lines and cast iron drain pipes — are frequently at end of life and benefit from replacement during a bathroom or kitchen renovation. Knob-and-tube electrical wiring requires an upgrade to modern wiring when kitchen or bathroom renovations involve new circuits or panel work.
Basement apartment conversions are also common in NDG as property owners maximize rental income potential. We handle the full scope of basement apartment development — egress window installation, legal ceiling height compliance, insulation, electrical, plumbing rough-ins, and finishes — with all required permits managed through the City of Montreal.
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Frequently Asked Questions
What type of roofing is most common in NDG?
NDG is dominated by duplexes and triplexes built between 1900 and 1950, most with flat or low-slope built-up roofing (BUR) or early EPDM membrane systems. These are typically replaced with modern 2-ply SOPREMA or IKO elastomeric membrane systems — the current Quebec standard for flat and low-slope roofs.
Do you repair brick facades in NDG?
The aging brick facades on NDG duplexes and triplexes require periodic tuckpointing and mortar repair to prevent water infiltration. Deteriorating mortar joints are one of the leading causes of water damage in Montreal pre-war buildings. We assess brick facades as part of our exterior evaluation and can coordinate masonry repair work.
How much does flat roof replacement cost in NDG?
A 2-ply elastomeric membrane flat roof replacement on a typical NDG duplex or triplex typically costs $8,000–$16,000 depending on the roof area, number of layers to remove, condition of the deck, and parapet wall detailing required. We provide free, detailed line-item estimates — call (514) 441-3807.
Do you do kitchen and bathroom renovations in NDG pre-war units?
Yes — pre-war NDG units have specific renovation challenges: original plumbing with galvanized steel or cast iron pipes, knob-and-tube electrical wiring, plaster walls over wood lath, and non-standard room dimensions. We have significant experience working in pre-war Montreal units and manage the full scope under one contract with full permit management.