Deck, membranes, flashings, ventilation and covering.
Plan a metal roof
Understand, measure and plan: plan a metal roof.
Prepared by RenoAtlas.ca · Content reviewed: 2026-08-02 · editorial method
Covering a wet or deteriorated deck.
Height, steep slope, power lines or complex details.
Calculate
Budget estimator
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Specialized equipment
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Extension ladder
Confirm capacity, accessories, transport, deposit, fuel and damage waiver.
No public rate in the database; request a local quote.
Scaffolding
Confirm capacity, accessories, transport, deposit, fuel and damage waiver.
No public rate in the database; request a local quote.
Rates often exclude tax, delivery, fuel, accessories, deposit and damage waiver. Confirm before booking.
Respiratory protection
Full mask guideSelect for the hazard, never by appearance
Possible hazards
- wood, gypsum, fibre or debris dust
n95 or better if assessedhepa capture
Priority controls
- Eliminate or reduce dust/vapour at the source before relying on a respirator.
- Use appropriate wet methods, HEPA capture, local exhaust and isolation.
- Read the SDS and exact product instructions.
What is not sufficient
- The respirator does not replace source extraction and HEPA cleanup.
Stop if
- Stop if the contaminant is unknown, air is inadequate, a seal is impossible or symptoms occur.
Final selection depends on contaminant, concentration, SDS, fit and the applicable program. An air-purifying respirator does not supply oxygen.
Red phase — professional oversight
Roofing, windows and envelope
A red page does not authorize a homeowner to perform regulated or high-consequence work. It is for preparation, oversight, documentation and acceptance. Permits, sealed drawings, provincial/municipal rules, manufacturer instructions, inspections and required trades prevail.
Absolute limit
This page explains expected professional work and homeowner oversight; it does not provide a procedure for personally performing regulated or hazardous operations.
Complete system to oversee
- 1
substrate and structure
- 2
appropriate air/vapour continuity
- 3
drainage membrane and flashings
- 4
ventilation and drainage space
- 5
cladding, roofing or window
- 6
joints, terminations and maintenance
Homeowner can do
- Define the need, expected result, constraints and maximum budget.
- Photograph, measure without dismantling and gather available drawings, invoices and history.
- Verify the authority having jurisdiction, permits, licences, insurance and references.
- Compare quotes using identical scope, products and quantities.
- Prepare access, protect belongings, keep a log and retain photos.
- Observe inspections without touching open, energized or pressurized systems.
- Refuse concealment of work that has not been inspected, tested and photographed.
- Complete written acceptance and retain final payment until corrections and documents are delivered.
Sometimes possible if allowed and competent
- Move furniture and protect unaffected areas if this can be done without exposure.
- Paint or complete cosmetic finishes only after concealed work is accepted, if permitted and within skill.
- Purchase products approved in the quote without substituting system components.
- Perform user maintenance listed in the manual after training and commissioning.
Must be done/verified professionally
- survey slopes, transitions, penetrations, moisture and substrate condition
- prepare water-management details for each interface
- remove work without unnecessary damage to retained layers
- repair substrate and install membranes/flashings in drainage sequence
- install fasteners, clearances and joints to the system
- perform water/air checks and document each detail before concealment
Never improvise
- Never open an electrical panel, alter gas/refrigerant connections, defeat a safeguard or work energized.
- Never remove a load-bearing element or start excavation without design, stability controls and utility locates.
- Never disturb suspected asbestos/lead material or significant contamination without qualified assessment.
- Never enter an unknown, confined or oxygen-deficient atmosphere with an air-purifying respirator.
- Never backfeed a home through a receptacle or improvise transfer equipment.
What you are actually paying for
Expected professional work
- envelope/roofing contractor
- designer for non-standard details
- inspector and waterproofing specialist as needed
survey slopes, transitions, penetrations, moisture and substrate condition
prepare water-management details for each interface
remove work without unnecessary damage to retained layers
repair substrate and install membranes/flashings in drainage sequence
install fasteners, clearances and joints to the system
perform water/air checks and document each detail before concealment
Ultra-detailed sequence
Eleven milestones from concept to warranty
Each milestone separates action, evidence, acceptance, hold and cost.
1
Define need and criteria
Turn “Plan a metal roof” into measurable scope.
What should be done
- Write expected functions, dimensions, capacity, appearance and target service life.
- List what remains, is removed, moved and excluded.
- Define tolerances, tests, documents and warranty before tender.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- survey slopes, transitions, penetrations, moisture and substrate condition
- slope and drainage path
Observe, compare with contract documents, document and request an explanation before any change.
survey slopes, transitions, penetrations, moisture and substrate condition
Written or photographic deliverable identified in the contract and added to the homeowner file.
slope and drainage path
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
2
Survey and diagnose existing conditions
Avoid pricing from invisible assumptions.
What should be done
- Survey dimensions, slopes, levels, access, services and damage.
- Use relevant non-destructive inspections before opening.
- Identify suspect materials, moisture, corrosion, cracks or recurring defects.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- prepare water-management details for each interface
- flashing and membrane continuity
Observe, compare with contract documents, document and request an explanation before any change.
prepare water-management details for each interface
Written or photographic deliverable identified in the contract and added to the homeowner file.
flashing and membrane continuity
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
3
Design and obtain approvals
Approve the solution before purchasing or demolition.
What should be done
- Confirm adopted code edition, local bylaws and required inspections.
- Obtain drawings, details, calculations or equipment selection from the competent person.
- Verify easements, boundaries, warranty, insurance and manufacturer requirements.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- remove work without unnecessary damage to retained layers
- substrate moisture before concealment
Observe, compare with contract documents, document and request an explanation before any change.
remove work without unnecessary damage to retained layers
Written or photographic deliverable identified in the contract and added to the homeowner file.
substrate moisture before concealment
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
4
Compare quotes and contract
Compare identical scope and allocate risk.
What should be done
- Require quantities, units, products, hours/crew, equipment, permits and exclusions.
- Identify allowances, contingency, concealed conditions and change process.
- Tie schedule and payments to verifiable milestones.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- repair substrate and install membranes/flashings in drainage sequence
- adhesion, fasteners and clearances
Observe, compare with contract documents, document and request an explanation before any change.
repair substrate and install membranes/flashings in drainage sequence
Written or photographic deliverable identified in the contract and added to the homeowner file.
adhesion, fasteners and clearances
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
5
Mobilize, protect and make safe
Prevent damage and exposure before opening.
What should be done
- Isolate area, protect occupants and control dust, water, weather and access.
- Verify shutdowns, lockout, utility locates and temporary stability.
- Confirm waste, delivery, equipment and emergency plan.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- install fasteners, clearances and joints to the system
- slope and drainage path
Observe, compare with contract documents, document and request an explanation before any change.
install fasteners, clearances and joints to the system
Written or photographic deliverable identified in the contract and added to the homeowner file.
slope and drainage path
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
6
Open and confirm concealed conditions
Validate design after exposure without improvising.
What should be done
- Use limited openings and preserve references before broad demolition.
- Compare actual conditions with assumptions and notify before any change.
- Document damage, dimensions, services and materials with scale and location.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- perform water/air checks and document each detail before concealment
- flashing and membrane continuity
Observe, compare with contract documents, document and request an explanation before any change.
perform water/air checks and document each detail before concealment
Written or photographic deliverable identified in the contract and added to the homeowner file.
flashing and membrane continuity
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
7
Execute the primary system
Install components in the approved sequence.
What should be done
- Use only compatible approved products, accessories and fasteners.
- Respect interfaces, supports, clearances, slopes and service access.
- Document every substitution and its warranty impact.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- survey slopes, transitions, penetrations, moisture and substrate condition
- slope and drainage path
Observe, compare with contract documents, document and request an explanation before any change.
survey slopes, transitions, penetrations, moisture and substrate condition
Written or photographic deliverable identified in the contract and added to the homeowner file.
slope and drainage path
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
8
Inspect and test before concealment
Prove concealed work before covering it.
What should be done
- Clean enough to see joints, fasteners, devices and defects.
- Perform specified tests with identified instruments and dated results.
- Obtain inspection/approval and photograph every interface before concealment.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- prepare water-management details for each interface
- flashing and membrane continuity
Observe, compare with contract documents, document and request an explanation before any change.
prepare water-management details for each interface
Written or photographic deliverable identified in the contract and added to the homeowner file.
flashing and membrane continuity
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
9
Close, finish and protect
Do not damage the accepted system during finishes.
What should be done
- Verify defects and change orders are resolved before concealment.
- Maintain access, ventilation, drainage, clearances and movement joints.
- Protect finished work until acceptance and repair damage.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- remove work without unnecessary damage to retained layers
- substrate moisture before concealment
Observe, compare with contract documents, document and request an explanation before any change.
remove work without unnecessary damage to retained layers
Written or photographic deliverable identified in the contract and added to the homeowner file.
substrate moisture before concealment
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
10
Commission and accept
Measure performance and obtain the final record.
What should be done
- Have every function, safeguard, control, shutdown and maintenance task demonstrated.
- Compare results with contract criteria and create a deficiency list.
- Receive closed permits, reports, warranties, concealed-work photos and spare parts.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- repair substrate and install membranes/flashings in drainage sequence
- adhesion, fasteners and clearances
Observe, compare with contract documents, document and request an explanation before any change.
repair substrate and install membranes/flashings in drainage sequence
Written or photographic deliverable identified in the contract and added to the homeowner file.
adhesion, fasteners and clearances
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
11
Monitor after completion
Detect defects early during warranty.
What should be done
- Inspect at 30 days, after the first season and before warranty expiry.
- Record noise, odour, leak, crack, movement, consumption or performance loss.
- Notify in writing with photos and dates rather than hiding the defect.
- Confirm in writing who is responsible, the deliverable and pass criterion for this stage.
- Photograph conditions before, during and after without interfering with safe work.
- Compare work with approved drawings, data sheets and instructions.
- install fasteners, clearances and joints to the system
- slope and drainage path
Observe, compare with contract documents, document and request an explanation before any change.
install fasteners, clearances and joints to the system
Written or photographic deliverable identified in the contract and added to the homeowner file.
slope and drainage path
Do not proceed or conceal this stage before acceptance, testing and applicable inspection.
Deviation from drawings, unknown condition, damage, leak, movement, odour, alarm or uncontrolled risk.
Any quantity variance, concealed condition or substitution must become a priced change order before execution.
Inspection and payment matrix
| Milestone | Criterion | Evidence | Payment |
|---|---|---|---|
| Scope frozen | slope and drainage path | Dated overall pre-work view with location references. | Payment only after evidence and correction of deviations. |
| After diagnosis | flashing and membrane continuity | Every side of opened surfaces and concealed conditions. | Payment only after evidence and correction of deviations. |
| Permits/drawings | substrate moisture before concealment | Product labels, models, certifications, lot numbers and invoices. | Payment only after evidence and correction of deviations. |
| After opening | adhesion, fasteners and clearances | Rough-in, supports, fasteners, flashings, membranes and devices before concealment. | Payment only after evidence and correction of deviations. |
| Rough-in/system | slope and drainage path | Test readings, instruments, inspection labels and corrections. | Payment only after evidence and correction of deviations. |
| Before concealment | flashing and membrane continuity | Final result, transitions, service access and serial numbers. | Payment only after evidence and correction of deviations. |
| Commissioning | substrate moisture before concealment | Dated overall pre-work view with location references. | Payment only after evidence and correction of deviations. |
| Final acceptance | adhesion, fasteners and clearances | Every side of opened surfaces and concealed conditions. | Payment only after evidence and correction of deviations. |
Critical tests
- slope and drainage path
- flashing and membrane continuity
- substrate moisture before concealment
- adhesion, fasteners and clearances
Photo log
- Dated overall pre-work view with location references.
- Every side of opened surfaces and concealed conditions.
- Product labels, models, certifications, lot numbers and invoices.
- Rough-in, supports, fasteners, flashings, membranes and devices before concealment.
- Test readings, instruments, inspection labels and corrections.
- Final result, transitions, service access and serial numbers.
Break down the quote
Compare measurable quantity, complete system, identical products and identical tests.
- 1access and protection
- 2removal and disposal
- 3substrate repair
- 4membranes and flashings
- 5insulation and air sealing
- 6cladding/roofing/windows
- 7sheet metal and trims
- 8equipment and weather protection
- 9testing and inspection
- 10warranty and cleanup
Required fields
- quantity, unit and measurement assumption
- product, model, grade, thickness and certification
- hours, crew, rate or labour allowance
- equipment, mobilization, access and protection
- permits, design, inspections and tests
- delivery, storage and disposal
- allowance, taxes, contingency and exclusions
- schedule, milestones and payment conditions
- labour and manufacturer warranties
- written concealed-condition and change process
Red flags
- lump sum without drawing, quantity or exact product
- permits or inspections called optional without confirmation
- demolition started before hazard characterization
- work concealed before photo, test or inspection
- cheaper substitution without credit or validation
- deposit or payment disproportionate to verifiable work
- verbal or unitemized change order
- no commissioning or closeout file
Questions to ask
- Who designs and assumes responsibility for sizing?
- Which code edition and local requirements are you using?
- Who obtains each permit and schedules each inspection?
- Which work will be subcontracted and to whom?
- Which exact products and system accessories are included?
- Which existing-condition assumptions support the price?
- Which concealed work may I photograph before closure?
- Which tests, values and reports will be delivered?
- Which conditions trigger a change order?
- How do you calculate additional labour, equipment and disposal?
- What milestone schedule do you propose?
- What amount remains until deficiencies are corrected?
- Who protects occupants and controls dust/water/weather?
- What written installation warranty applies?
- Which documents and spare parts will be delivered?
Payments
- Deposit limited by local rules and identified actual orders.
- Payment after each milestone, evidence and inspection—not merely by date.
- No payment for concealed work before tests and photos.
- Retain final amount until corrections, closed permits and documents.
- Verify provincial holdback, lien and release rules.
Change orders
- Describe the condition with photos before altering it.
- Obtain minimum-compliant, recommended and optional-upgrade options.
- Itemize quantities, materials, hours, equipment, delay and credit.
- Obtain designer/inspector approval if the solution changes.
- Authorize in writing before work except documented emergency action.
- Update cumulative budget and schedule.
Required closeout file
- Closed permits and inspection reports.
- As-built drawings and concealed-work photos.
- Test and commissioning reports with values.
- Detailed invoices, releases and subcontractor list.
- Data sheets, certifications, warranties and serial numbers.
- Manuals, maintenance schedule and spare parts.
- Signed and closed deficiency list.
- Service contacts and emergency procedure.
Post-work monitoring
- Inspection at 30 days, after first season and before warranty expiry.
- Follow manufacturer schedule and keep maintenance evidence.
- Monitor leaks, cracks, movement, noise, odour, alarms and consumption.
- Do not hide a recurring defect with a cosmetic repair.
- Reassess after damage, alteration or performance loss.
Inspection
Full defect libraryDefects to recognize before, during and after this project
Defects homeowners often encounter on this type of project. Some records use credited real photos; others use conceptual references. Symptoms and real-world context remain the reference.
Chimney, combustion and draft problems
Startup smoke spillage, creosote deposits, deteriorating masonry or odour reversal can signal fire or carbon-monoxide risk.
- Smoke or gas odour, abnormal soot, weak draft or a CO alarm.
- Spalled masonry, open joints, missing cap or water in the firebox.
Water stains and active leaks
Rings, blistering paint, soft drywall or visible water signal a water path that must be traced before repairing finishes.
- Brown or yellow rings on ceilings or upper walls.
- Blistering paint, opening joints or soft drywall.
Visible mould and musty odour
Mould is rarely an isolated defect: it usually signals a moisture source, inadequate drying or a material that stayed wet too long.
- Black, green, grey or white spotting on materials.
- Persistent basement, wet cardboard or earthy odour.
Failed shingles, flashings and roof penetrations
A roof covering does not always leak directly above the interior symptom; wind and flashing details can divert water.
- Curled or missing shingles or excessive granule loss.
- Lifted flashing, cracked sealant, exposed nails or staining below a penetration.
Verified references
- National Building Code of Canada 2025Canada model code
- Model code adoption across CanadaProvincial and territorial adoption
- CCOHS — Respirator SelectionCanadian respirator selection and program guidance
- Health Canada — Medical masks and respirators: information for usersN, R and P filter classifications and authentic respirators
- NIOSH — Respirator Types and UseFit testing, use and respirator types
- NIOSH — Identifying NIOSH Approved RespiratorsApproval label and TC number verification
Understand the system
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