ROOFNOW™ Ontario Roof Retrofit Planning

Replacing Cedar and Wood Shingle Roofs with Metal in Greater Sudbury, Ontario

Assess old wood roofing, ventilation spaces and deck conditions before designing a permanent metal replacement.

Local retrofit context: Greater Sudbury is part of Northern Ontario, where rocky-terrain, cold-climate and snow-exposed roofing experience long winters, heavy snow, strong wind, cold temperatures and demanding freeze-thaw conditions. Nearby communities include Espanola, North Bay and Elliot Lake. Installed cost is shaped by the complete roof assembly, not by field panels alone. Existing layers and field conditions should be verified before the final metal system is ordered.

Understand the complete existing assembly

Cedar shakes and wood shingles may be installed over boards, spaced sheathing, battens or later reroofing layers. Moisture, splitting and concealed fasteners can make surface appearance a poor guide to the supporting deck. The retrofit plan should identify the full assembly before selecting underlayment or attachment.

A reliable scope separates investigation, removal, temporary protection, structural or deck repair, underlayment, permanent metal and restoration of adjacent walls or drainage. It also defines how concealed changes are documented and approved.

Conditions to examine

Wood type, age and number of layers
Solid deck, spaced boards or battens
Moisture staining, decay and attic ventilation
Chimney, valley and wall-flashing conditions

Retrofit mistakes to avoid

Covering decayed wood without investigation
Assuming spaced sheathing supports a new system
Leaving combustible debris in concealed cavities
Reusing brittle wall and chimney flashings

Inspect before choosing the replacement

Lift representative areas at eaves, valleys and penetrations to confirm layers and attachment. From the attic, look for daylight, staining, soft boards and blocked ventilation. Document whether the wood roof is the original drainage surface or sits above older materials.

For a cedar shakes or wood shingles project in Greater Sudbury, record roof zones, slopes, penetrations and prior repairs with photographs. Surface appearance alone cannot confirm the deck, moisture or attachment beneath it. The quotation should state the investigation completed and the assumptions that remain.

Plan removal and daily weather protection

Plan removal in manageable weather-tight sections. Dry wood debris can scatter easily, so ground protection, containers and daily cleanup matter. Any suspect material or special disposal condition should be identified and handled through the appropriate project-specific process.

Agree on material access, debris containment, landscaping protection and the area that can be safely opened each day. Temporary dry-in needs positive laps, secure terminations and drainage. It should not become an indefinite substitute for the permanent roof.

Prepare the deck and roof enclosure

After removal, verify that boards are sound, aligned and suitable for the selected metal system. Add or replace structural sheathing only according to the approved design. Correct air leakage, insulation gaps and ventilation paths while the roof is open.

Before covering the substrate, verify flatness, fastening, dry condition and all required blocking. Coordinate insulation, air sealing and ventilation where the opened roof makes deficiencies visible. Photograph the prepared deck and concealed repairs for the closeout file.

Build new transitions instead of copying old ones

New eave, valley, chimney and wall details should connect to the actual deck and water-control layers. Do not reproduce old face-sealed joints merely because they appeared dry. Photograph concealed work and keep a record of removed layers.

Eaves, rakes, valleys, walls, chimneys and penetrations must match the selected system and finished assembly thickness. Confirm measurements after demolition where conditions were concealed. Future service should not require destructive access to unrelated roof areas.

Quotation and closeout checklist

Identify every existing roof layer
Define removal and disposal limits
Describe deck-repair authorization
Name the exact metal system and finish
Detail flashings, drainage and ventilation
Provide photographs and product records

Compare proposals using the same boundaries. Clarify permits or project-specific reviews, temporary protection, site cleanup, wall restoration, accessories and exclusions. At closeout, inspect the complete roof and keep surplus material, colour codes, warranty information and concealed-work photographs.

Frequently asked questions

Can metal be installed directly over cedar shakes or wood shingles?

Sometimes an overlay may be technically possible, but only after confirming layers, moisture, substrate, attachment, slope, edges and product requirements. This page does not replace a site assessment.

When should final metal measurements be taken?

After the substrate and critical transitions are verified. Concealed conditions can change plane lengths, edge heights and custom flashing dimensions.

What should homeowners keep after the project?

Keep the proposal, change records, product identifiers, warranty documents, deck and flashing photographs, care guidance and labelled surplus material.

Plan the replacement from the deck outward

ROOFNOW™ can assess the existing roof and prepare a project-specific permanent metal-roof scope.

Visit ROOFNOW™ Roofing Specialists

Planning note: General educational guidance only. Confirm structure, materials, moisture, disposal, product requirements and project-specific approvals with the responsible professionals and authorities.