ROOF REPLACEMENT / PHOENIX METRO
A replacement is
a specification,
not a price.
Two proposals for the same roof can describe very different work. The difference is usually in what each one includes beneath the surface.
01 / THE CUSTOMER PROBLEM
Comparing numbers
that are not
comparable.
Replacement decisions are often made by comparing totals. A total only means something once you know the scope behind it, and scopes vary more than most proposals make obvious.
02 / WHAT THE WORK COVERS
Ask for the
scope in writing.
A replacement scope describes an assembly, not just a surface. A complete proposal should address each of these:
- Tear-off: what is removed, and how much of the existing assembly comes off
- Deck inspection: how the deck is assessed once exposed, and how replacement of damaged sheathing is priced
- Underlayment: the product specified and how it is installed
- Flashing and penetrations: which are replaced and which are reused
- Edge details, valleys, and terminations
- Ventilation: whether the existing arrangement is retained, altered, or assessed at all
- Permits, inspections, debris removal, and site protection
03 / SUITABILITY AND LIMITS
Where this fits.
Where it does not.
Generally a fit for
- A roof with general deterioration rather than one isolated defect
- Repeated repairs in different areas of the same roof
- A system at or near the end of its expected service life
- An owner who wants a defined starting point and a documented assembly
Ask harder questions when
- A single identifiable defect on a roof that is otherwise sound
- A situation where the cause of the problem has not been established
- Cases where a proposal has been produced without the roof being examined
- Any recommendation you cannot get explained in terms of what was found
04 / INSPECTION CONSIDERATIONS
What an assessment
should look at.
These are the things worth confirming were examined, whoever carries out the assessment.
01
Establish what is there now.
The existing system, its condition, and any previous work determine what a replacement has to account for.
02
Look at the deck question early.
Deck condition is usually unknown until tear-off. Ask how damaged sheathing is identified, priced, and authorised mid-project.
03
Treat details as part of the scope.
Flashings, penetrations, and transitions are where assemblies commonly fail. Ask which are being replaced rather than reused.
04
Confirm the permit path.
In Arizona, work requiring a local building permit must be performed by a licensed contractor. Ask who pulls the permit and what inspections apply.
05 / OPTIONS TO COMPARE
More than one
reasonable answer.
Which option suits a property depends on findings this site cannot see. Each one carries its own questions.
01 Like-for-like replacement
Replaces the existing system with a comparable one. The simplest comparison, and often the reference point for other options.
Ask whether the existing system performed acceptably, and whether anything about the property argues for a change.
02 Change of system
Moves to a different roofing system, usually for performance, weight, appearance, or maintenance reasons.
Ask what the change requires structurally, what it changes about maintenance, and why it is being recommended.
03 Partial replacement
Replaces a defined section, such as a single slope or a low-slope area, while leaving the remainder.
Ask how the new and existing sections will be tied together, and how that transition will be detailed.
04 Staged replacement
Splits the work across phases for budgeting or occupancy reasons.
Ask how the untouched sections will be protected, and what the sequence means for warranties and future work.
06 / COST DRIVERS
Why two proposals
are not the
same number.
These factors legitimately change a replacement figure. Use them to ask why two proposals differ rather than assuming the lower one is the same work.
01
Scope of tear-off.
How many layers are removed, and whether the assembly is taken back to the deck.
02
Deck repair allowance.
How unknown sheathing damage is handled: an allowance, a unit rate, or an open variation.
03
Specified materials.
The actual products named in the proposal, not a material category.
04
Detail count and complexity.
Penetrations, valleys, transitions, and roof geometry.
05
Access and site conditions.
Height, pitch, equipment, staging space, and protection of the surrounding property.
07 / QUESTIONS
Before you
decide.
How do I compare two replacement proposals?
Compare the assemblies, not the totals. Put the specified underlayment, flashing treatment, deck allowance, ventilation approach, and exclusions side by side. Where a proposal is silent on one of those, treat the silence as the difference and ask about it.
Does a roof replacement need a permit in Arizona?
Permit requirements are set by your local jurisdiction, so confirm with the authority for your address. The requirement matters for licensing: under A.R.S. 32-1121, the exemption for small jobs does not apply where the work requires a local building permit. Licences are searchable at roc.az.gov.
What happens if they find damaged decking?
Ask before the work starts. A proposal should state how damaged sheathing is identified, how it is priced, and who authorises the additional work. Discovering this mid-project is the most common source of disputed cost.
What warranty comes with a replacement?
Two separate things are usually involved: a manufacturer warranty on the materials and a contractor warranty on the workmanship, each with its own terms and exclusions. Ask for both in writing, from whoever you hire, before you sign.
How long does a replacement take?
No timeline is published here. Duration depends on the roof, the system, the weather, and inspection scheduling. Ask for a sequence and a basis rather than a single number.
Start with your roof.
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