Building envelope



Your Building Envelope Deserves Full Project Management

The building envelope is a structure’s exterior protection system: cladding, insulation, air barriers, waterproofing membranes, and fenestration. Besco Construction offers complete installation and repair services across Greater Montreal for commercial, multi-residential, and institutional buildings.

Signs of water infiltration or heat loss?


The Components of a High-Performance Envelope

The building envelope is a system of interdependent layers. A defect in one layer compromises the others. Besco Construction treats the building envelope as a whole, not as a series of isolated repairs:

  • Facade restoration: masonry, metal cladding, panels, or stucco
  • Thermal insulation: rigid, semi-rigid, or spray-applied
  • Air barriers and vapour barriers
  • Waterproofing: membranes, flashing, sealants, and perimeter drainage
  • Fenestration: windows, doors, and curtain walls

Diagnosis and Detection of Envelope Problems

Damage works inside the walls before it becomes visible. Besco Construction performs a diagnosis before recommending any work. You receive a clear picture and an action plan tailored to your budget.

What should alert you:


  • Recurring infiltrations after rain or snowmelt
  • Mould around windows or inside walls
  • Unexplained increase in heating costs
  • Cracks, delamination, or efflorescence on the exterior cladding

Rehabilitation and Full Installation

Existing Buildings

Work is planned in phases to limit the impact on occupants.


  • Replacement of end-of-life exterior envelope
  • Waterproofing restoration on flat roofs
  • Addition of exterior insulation
  • Replacement of failing sealants and flashin

New Construction

On a new building, the envelope is planned from the design stage. Building height, wind exposure, project use: every factor determines the materials and methods. Besco Construction coordinates the full installation in parallel with the structure.


Our teams work in Longueuil, Brossard, and across the South Shore. Diagnosis, targeted repair, or full installation: two offices, in Lachine and Brossard, allow us to be on site quickly.

Every season puts your envelope to the test.