Common low-slope roof types
Spray foam (SPF)
Seamless, insulating, and conforms to odd shapes. Needs its UV coating maintained. Look out for bare or eroded foam and blisters.
Elastomeric coatings
Acrylic, silicone and similar coatings, often in reflective white, applied over foam, metal or existing roofs that are still sound.
Single-ply & modified bitumen
Sheet membranes with sealed seams. Seams and flashing details are the usual trouble spots.
Manufactured home roofs
Often metal or low-slope roofs. Coatings and roof-over systems are common options. The right choice depends on the structure and what's already there.
Warning signs
- Water that stays in low spots for more than a day or two after rain
- Chalky, cracked or peeling coating; foam showing through
- Blisters, soft spots or bird pecking in foam
- Open seams or loose flashing at walls, curbs and swamp coolers
- Leaks near rooftop equipment
Maintenance that helps
- Have the roof checked periodically and after storms. Small foam and coating repairs are quick.
- Keep drains and scuppers clear of dust and debris so water can leave.
- Limit foot traffic. Ask service techs to use walk pads around equipment.
- Ask your contractor what recoat interval they recommend for your coating.
Related: roof repair · replacement
Flat & foam roof FAQ
What is a spray foam roof?
Spray polyurethane foam (SPF) is sprayed on as a liquid that expands into a seamless, insulating layer, then covered with a protective coating. The coating shields the foam from sunlight and needs to be renewed periodically.
Who is licensed to install foam roofs in Nevada?
Nevada's contractor classifications (NAC 624) include C-15a roofing, and a separate C-36 classification for polyurethane foam and coatings, including weatherproof roofs. Ask the contractor which license they hold and verify it at nvcontractorsboard.com.
Can a coating fix my leaking flat roof?
A coating can renew a roof that is still basically sound, but it won't fix wet insulation, rotted decking or a failed membrane underneath. A contractor should check moisture and adhesion before recommending a coating.