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Bay/bow window: support, insulation, air and flashing

A projecting window is also a small structural/enclosure assembly: support, roof/soffit, water, air, insulation and condensation must work together.

Decision triage

VERT / GREEN · JAUNE / YELLOW · ROUGE / RED

What the professional checks

The professional checks opening/header, brackets/cables/support, deflection, flashing, drainage, air barrier, insulation and condensation.

Official sources

Sources checked: 2026-08-24

Related path

Continue with the right tools

These links connect this page to the next useful checks and decisions without repeating the full content.

Connect symptoms to the enclosureStart from condensation, staining, odours or movement before choosing a repair.Open →Adapt the enclosure to climateConnect heat, cold, water, wind and wildfire to building priorities.Open →Assess overall resilienceReview water, climate, safety, autonomy and records with a local score.Open →Screen hazardous materialsIdentify situations where work should stop and testing is needed before disturbance.Open →Open climate guidanceReview climate constraints relevant to assemblies and materials.Open →
Explore: Systems to check before closing the work

Systems to check before closing the work

This section connects envelope, air, fire, structure, water and code instead of treating each project in isolation.

Renovation dependenciesEnvelope and condensationLoad-bearing walls and openingsRoof penetrations and flashingCode versions
Explore: Remaining system checks not to miss

Remaining system checks not to miss

This section covers issues that can block a project, cause a loss or become expensive once concealed.

Before closing wallsPost-renovation commissioningCodes + climate by province
Explore: Specialized diagnostics to verify

Specialized diagnostics to verify

This section connects systems that become costly or regulated when a primary project triggers them.

Basement window well + egress
Explore: Edge systems to integrate into the project

Edge systems to integrate into the project

This section covers interfaces that become important when multiple home systems interact.

Skylight/tubular daylightingSIP/ICF
Explore: Often-overlooked service interfaces

Often-overlooked service interfaces

This section connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.

Attic hatch and pull-down stairsExterior window shading and overheating
Explore: Project risks and overlooked interfaces

Project risks and overlooked interfaces

This section connects payment, water, envelope, ventilation and jobsite details that often create costly surprises.

Safety glazing, showers and guardsTemporary weather protection during renovation
Explore: Finish and service details to verify

Finish and service details to verify

This section connects small details that become costly once finishes are closed.

Attic soffit baffles and ventilation
Explore: Household safety and compliance details

Household safety and compliance details

This section connects smaller risks that often fall between finishes, appliances, plumbing and local code.

Sealant joints, backer rod and movementCorded window coverings and child safety
Explore: Shared, access and specialized interfaces

Shared, access and specialized interfaces

This section connects projects where multiple systems, owners or rules meet.

Windows in masonry openings
Explore: Commissioning and everyday safety

Commissioning and everyday safety

This section helps verify systems after work and document the values that make a home safer to operate.

Windows and child fall prevention
Explore: Post-disaster and legacy systems

Post-disaster and legacy systems

This section connects contamination, storm damage, legacy materials and recommissioning before rebuilding.

Storm/tree impact: structure, re-entry and stabilization
Explore: V47 interfaces not to miss

V47 interfaces not to miss

These details are small on a drawing but can control water, structure or durability.

Roof-wall kickout