Gaco Roof Foam and Silicone Systems Guide

How spray polyurethane foam and a compatible Gaco silicone coating form a complete commercial roof assembly, from substrate review through closeout.

Roofing Contractors Association of Texas member

Commercial roofing guide 02/16/2026

Planning a roof foam and silicone assembly

A spray polyurethane foam roof uses field-applied foam to create insulation and a continuous surface, then protects that foam with a compatible elastomeric coating. Gaco publishes complete roof-foam routes paired with silicone materials; the finished system depends on substrate condition, foam application, drainage, details, coating coverage, and ongoing maintenance.

This guide helps commercial property teams understand the full assembly before considering it for new roofing or reroofing.

Decision guide

How the Gaco foam and coating system works

Gaco describes roof foam as part of complete systems for new construction and reroofing, paired with silicone protective coatings. The foam creates an adhered, insulated surface and can be shaped around roof geometry; the silicone protects it from ultraviolet exposure and weather.

Current system specifications, product data, approved substrates, design requirements, and details should govern the actual assembly.

Manufacturer reference: Gaco roofing systems and roof foam overview.

Decision guide

Substrate and existing-roof candidacy

The review should confirm the deck or existing roof, attachment, moisture, structural concerns, contaminants, surfacing, drainage, penetrations, curbs, perimeters, and retained materials. Foam cannot responsibly be applied over wet, loose, incompatible, or unsound construction.

Test cuts, moisture testing, pull tests, or design review may be needed where hidden conditions or attachment could change the scope.

Decision guide

Components of a foam-and-silicone assembly

Prepared substrate

Clean, dry, sound construction with required removal, repairs, priming, and attachment checks completed.

Spray polyurethane foam

Field-applied insulation shaped to the specified thickness, continuity, slope, and surface quality.

Details and transitions

Coordinated work at penetrations, curbs, drains, perimeters, walls, equipment, and changes in substrate.

Protective silicone coating

Compatible coating applied over accepted foam at the specified coverage with inspection and records.

Decision guide

Foam application quality matters

Foam temperature, substrate temperature, wind, humidity, pass thickness, lift quality, density, adhesion, surface profile, and transitions affect the finished roof. Off-ratio, poorly bonded, wet, irregular, or damaged foam should be corrected before coating.

The work plan should define environmental monitoring, daily test or inspection requirements, and protection from overspray.

Decision guide

Drainage, penetrations, and perimeter details

Foam can be shaped, but drainage still requires a coordinated design and sound outlets, scuppers, gutters, overflows, curbs, and edge conditions. Water should not be trapped behind equipment, at transitions, or against raised details.

Penetrations and perimeters need compatible detailing that remains serviceable when equipment or roof access changes.

Decision guide

Silicone coating and coverage control

The protective coating should be applied after foam acceptance and within the system’s timing and weather requirements. Coverage must account for foam surface texture, slopes, vertical transitions, and detailed areas.

Material-use records, photographs, coverage or thickness checks, and punch-list inspections connect the completed coating to the specified scope.

Decision guide

Occupied-building and overspray planning

Protect vehicles, equipment, adjacent properties, air intakes, people, inventory, and sensitive operations. Wind limits, work zones, temporary closures, interior monitoring, and daily weather-ready conditions should be established before spraying begins.

Trade coordination is especially important at mechanical equipment, electrical services, and later penetrations.

Decision guide

Maintenance and recoating

The protective coating must remain continuous because exposed foam is vulnerable to ultraviolet degradation and moisture. Inspect traffic areas, drains, penetrations, equipment interfaces, repairs, and signs of coating wear or physical damage.

Localized repairs and eventual recoating should use compatible materials after cleaning, preparation, and condition assessment.

Frequently asked questions

Gaco Roof Foam And Silicone Systems FAQs

Can any commercial roof be coated?

No. The surface must be compatible and sound, with moisture and existing defects addressed before the proposed coating is applied.

Will coating repair holes or loose panels?

No. Damaged metal, failed connections and other defects need their own repairs before coating.

Can a new coating go over an old coating?

Only where the old finish is suitable to remain. Adhesion, contamination and compatibility checks help establish the preparation required.

Is silicone always better than acrylic?

No. Product choice depends on the substrate, exposure, application conditions and future maintenance. Compare the specified system for your roof.

Does ponding-water resistance mean drainage can be ignored?

No. A coating does not increase drain capacity or correct the roof's fall. Persistent standing water still needs investigation.

Why do two coating quotes differ so much?

Preparation, repairs, primer, detail reinforcement and finished thickness can vary substantially. Compare those items as well as roof area.

Can the coating be applied in any weather?

No. Roof temperature, surface moisture, rain and curing conditions must fall within the selected product's limits.

Will a reflective coating reduce our energy bills?

It may reduce solar heat absorbed by the roof. Actual building savings depend on insulation, climate, HVAC use and other conditions.

Is an extra 10 or 20 years guaranteed?

No general lifespan promise applies to every roof. Review the actual proposed work and the terms of any applicable written warranty.

What information is useful before a coating survey?

The address, known roof material, existing coating name and current defects. Old product records and photographs help if available.

Move from guidance to property information

Discuss the commercial roofing decision for your facility

Share the property address, known roof information, current concern, and available project documents so the next step can be defined around the building.

Discuss Your Project

UK refurbishment experience, a Texas office

Refurbishment specialists

Our business grew through roof and cladding refurbishment in the UK. That experience shapes the work we now offer from our Texas office.

Repair what can be retained

We investigate the roof problem and explain what can be repaired, restored or replaced, so you can decide how to invest in the building.

Roofing and cladding together

We can coordinate roof, insulation, wall panel and drainage work, including the connections where separate repairs can leave problems behind.

A plan for your working building

We agree access, work areas and protection with your site team, including any restrictions needed while the roof is opened.