Do not begin a historic-roof project by choosing a modern product from a color board. First establish what makes the roof significant, what has failed and which local review or funding conditions apply.
1. Confirm the property's status
A home can be old without being individually listed, and it can be subject to historic-district review even when the owner does not consider it a landmark. Check:
- Local historic register or district status
- Preservation easements or covenants
- Grant or incentive requirements
- Homeowners association rules
- Permit and code requirements
- Insurance conditions
The City of Phoenix General Design Guidelines define roof form, pitch, materials, finishes and craftsmanship as parts of architectural compatibility. Contact the relevant office before finalizing exterior changes when the property is regulated.
2. Document the existing roof
Create a record before materials are removed:
- Overall roof form and pitch
- Eaves, rakes, hips, ridges and valleys
- Parapets, scuppers and drainage
- Dormers, chimneys and vents
- Material size, profile, texture and pattern
- Flashing type and visible details
- Prior alterations
- Attic-side evidence where safely accessible
- Historic photographs or plans when available
The National Park Service Preservation Briefs include roofing guidance intended to help owners recognize problems and select approaches consistent with historic character.
3. Diagnose the failure
A leak does not automatically mean the historic surface is exhausted. Water may enter through:
- Worn flashing
- Open valleys
- Failed underlayment
- Broken or displaced pieces
- Corroded fasteners
- Blocked drainage
- Incompatible prior patches
- Deck or structural movement
Inspect the roof as a system. Repairing a flashing may preserve sound historic material; coating an incompatible surface can destroy evidence and create a larger replacement problem.
4. Compare repair with replacement
Selective repair may fit when
- Damage is isolated
- Matching material is available
- Substrate and surrounding roof remain sound
- Historic details can be retained
- Repair will restore drainage and weather protection
Replacement may be justified when
- Deterioration is widespread
- Hidden layers or decking have failed
- Repeated repairs no longer integrate
- Material is unsafe or no longer serviceable
- The roof assembly cannot meet required performance through repair
The decision should be documented by roof area. “Old” is not a technical reason to replace everything, and “historic” is not a reason to leave active water entry unresolved.
5. Write a preservation-aware scope
A proposal should identify:
- Materials and details to retain
- Areas to repair or replace
- Salvage and temporary protection plan
- Replacement material and match criteria
- Deck and framing assumptions
- Flashing and drainage details
- Ventilation and insulation boundaries
- Required samples or mockups
- Permit and preservation approvals
- Photo documentation before, during and after work
Use the companion historic roofing material guide for matching decisions and the historic roof approval and documentation guide for process planning.
6. Match character without recreating defects
Compatibility may involve roof form, profile, coursing, exposure, color, texture, edge treatment and visible flashing. A substitute material can sometimes preserve the appearance when original material is unavailable, but it should be evaluated against the building rather than marketed as “historic-looking.”
The City of Phoenix wood-shingle guidance shows the level of documentation that may be needed: original material, size, shape, exposure, nailing pattern and distinctive details.
Modern code, fire and drainage requirements still apply. Coordinate those requirements early so a necessary safety feature is integrated with minimal visual disruption.
7. Protect the building during work
Historic interiors and finishes can be especially vulnerable to water and vibration. The construction plan should cover:
- Weather monitoring and temporary dry-in
- Daily protection of open areas
- Salvage storage
- Debris and dust control
- Interior monitoring around sensitive rooms
- Structural loading and material staging
- Protection of landscaping and adjacent historic fabric
Bottom line
A historic roof project succeeds when the building remains dry and the character-defining roof form, materials and details are understood before work begins. Verify review requirements, document the roof, diagnose the failure and write a scope that separates preservation from guesswork. America Roofing can assess the roofing assembly and coordinate a documented proposal through its roofing services. To begin, request a free roofing estimate.
Primary references
Sources used for this guide
- Preservation Briefs U.S. National Park Service
- General Design Guidelines for Historic Properties City of Phoenix Historic Preservation Office
- Wood Shingle Roofs City of Phoenix Historic Preservation Office