V39 · Specialized diagnostic

Metal roof: snow sliding and retention

Evaluate fall zones, loads, attachments and consequences before adding snow-retention devices.

VERT / GREEN · JAUNE / YELLOW · ROUGE / RED triage

Entry/walkway below slope
Map the fall zone and risk to people.Snow falls on lower roof/equipment
Have retention strategy and transferred loads reviewed.Roof penetrations proposed
Do not improvise attachments; preserve waterproofing and structural capacity.No exposed fall zone
Still document seasonal accumulation and incidents.

What the professional checks

The roofer/designer verifies roof profile, compatible attachments, snow loads and device layout.

Official / technical sources

CNRC — glissement de la neige (référence historique) ↗CNRC — Code national du bâtiment 2025 ↗

Sources checked 2026-08-23. Local requirements and exact products control.

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 →

Tools related to this issue

V14

Systems to check before closing the work

V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.

Renovation dependenciesRoof penetrations and flashingCode versions

V16

Advanced diagnostics to cross-check

V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.

Roof snow and iceJobsite safety and silica

V17

Specialized systems to cross-check

V17 completes gas, soil, water, fire, climate and structural interfaces.

Wildfire and embers

V18

Specialized diagnostics to verify

V18 connects systems that become costly or regulated when a primary project triggers them.

Low-slope roofRoof deck over living space

V19

Edge systems to integrate into the project

V19 covers interfaces that become important when multiple home systems interact.

Skylight/tubular daylightingGreen roof

V26

Often-overlooked service interfaces

V26 connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.

Electrical service, mast and meterHeat pump outdoor unit, snow and defrost

V27

Project risks and overlooked interfaces

V27 connects payment, water, envelope, ventilation and jobsite details that often create costly surprises.

Gutters, downspouts and roof drainageTemporary weather protection during renovation

V28

Finish and service details to verify

V28 connects small details that become costly once finishes are closed.

Slate or clay tile roofing

V30

Shared, access and specialized interfaces

V30 connects projects where multiple systems, owners or rules meet.

Solar PV: roof attachment, structure and flashing

V32

Post-disaster and legacy systems

V32 connects contamination, storm damage, legacy materials and recommissioning before rebuilding.

Hail: roof and envelope impact assessment

V47

V47 interfaces not to miss

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

Roof-wall kickoutRoof-edge drip