FOAM & FLAT ROOFING / PHOENIX METRO
Low-slope roofs
are maintained,
not finished.
A low-slope roof has an ongoing maintenance requirement built into how it works. Treating installation as the end of the decision is where most of the surprises come from.
01 / THE CUSTOMER PROBLEM
Installed once.
Owned for
years after.
Spray polyurethane foam and other low-slope systems depend on a protective surface layer and on water actually leaving the roof. Both are ongoing conditions, not one-time events.
02 / WHAT THE WORK COVERS
Ask for the
scope in writing.
A low-slope proposal should describe the system, its protective layer, and what maintaining it involves:
- The existing system and its condition, including any previous coatings or repairs
- What the proposed work does: recoat, repair, overlay, or full replacement
- For foam, the protective coating specified and the thickness it is applied at
- How drainage is assessed and whether ponding areas are addressed
- Treatment of penetrations, curbs, equipment supports, and edge details
- The maintenance the system will require afterwards, and on what basis that schedule is set
- What the proposal assumes about future recoating, and who is responsible for it
03 / SUITABILITY AND LIMITS
Where this fits.
Where it does not.
Generally a fit for
- Low-slope and flat roof areas
- Buildings with rooftop equipment and numerous penetrations
- Owners prepared to maintain a system on a schedule rather than ignore it
- Properties where an existing low-slope system can be recoated or overlaid rather than replaced
Ask harder questions when
- Steep-slope areas, which call for different systems
- Saturated or failed substrates, where coating over the problem conceals it
- Situations where drainage problems have not been addressed
- Owners who need a genuinely maintenance-free assumption, which no low-slope system provides
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 already on the roof.
Existing systems, previous coatings, and past repairs determine what can be applied over them.
02
Check whether the substrate is dry.
Moisture trapped beneath a coating or overlay does not go away. Ask how the substrate was assessed before anything was proposed over it.
03
Look at drainage.
Where water stands, and why, is a roof design question as much as a materials question.
04
Inventory the penetrations.
Equipment curbs, supports, and penetrations are where low-slope roofs commonly leak, and they are often the bulk of the detail work.
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 Recoat an existing foam roof
Restores the protective layer over foam that is otherwise sound. The routine maintenance event for this system.
Ask how the existing surface is prepared, which coating is specified, and at what thickness.
02 Repair and recoat
Addresses defined damage before restoring the protective surface.
Ask which areas are being repaired and how they were identified.
03 Overlay or new low-slope system
Installs a new system over or in place of the existing one.
Ask what happens to the existing assembly, and how the substrate was confirmed suitable.
04 Full tear-off and replacement
Used where the existing assembly or substrate cannot be built over.
Ask what evidence rules out the less invasive options.
06 / COST DRIVERS
Why two proposals
are not the
same number.
Low-slope figures move with the condition of what is already there and with the specification of the protective layer.
01
Substrate condition.
Whether the existing assembly can be built over, or has to come off.
02
Coating specification.
Product and applied thickness, which affect both cost and the maintenance interval.
03
Detail and penetration count.
Curbs, supports, and equipment, which are labour-intensive regardless of area.
04
Drainage corrections.
Any work to change where water goes rather than only what it sits on.
05
Access and occupancy.
Working around an operating building, its tenants, and its equipment.
07 / QUESTIONS
Before you
decide.
How often does a foam roof need recoating?
It depends on the coating specified, the thickness applied, and the exposure on your building, so this site does not publish a single interval. Ask for the interval a proposal assumes, the basis for it, and what inspection schedule goes with it.
Why does foam need a coating at all?
The coating is the protective, weather-facing surface over the foam. Ask which coating is specified, how thickly it is applied, and what maintaining it involves over time.
Is ponding water a problem?
Standing water is worth asking about, because it indicates where drainage is not working and it changes how the surface is loaded. Ask whether ponding was observed, what is causing it, and whether the proposal addresses the cause or only the surface.
Can a new system just go over the old one?
Sometimes, but only if the substrate is sound and dry. Ask how that was established before an overlay was proposed, because trapped moisture is not resolved by covering it.
Do you offer maintenance programmes?
Call and describe the building and the system on it. Whether a scheduled programme makes sense depends on the roof, and it is worth talking through rather than signing up to blind.
Start with your roof.
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