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Roof guide

When Should You Recoat a Flat Roof?

Recoat a little early and you save the roof. Wait too long and you're replacing foam.

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  • Plain-English answers
  • Written for Corrales homes
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Diagram: foam flat roof cross-section with coating, sprayed foam, existing roof, a foam cant at the parapet and a canale
How a foam flat roof is built.

Signs it's time

  • The coating rubs off chalky on your hand
  • You can see the color of the foam through it
  • Fine cracks or checking across the surface
  • Peeling or blistering, especially near parapets
  • Bare tan or brown foam in spots — that's overdue

Why timing matters

As long as foam is covered, a recoat is mostly cleaning and coating. Once foam is exposed to sun, it degrades and has to be cut out and replaced before coating. The longer it waits, the more foam work.

Best time to recoat

Coatings need dry weather and suitable temperatures to cure. Late spring and early fall are often ideal around Corrales — after spring winds calm down, and around monsoon afternoons in summer.

Make it last

Keep the roof clear of leaves, clean canales, keep foot traffic off and fix punctures quickly.

See roof coatings.

Roofing questions

How do I check my coating?

From a safe spot, look for color showing through and chalkiness. Or call for an inspection.

Can I recoat myself?

Prep and thickness are what make a coating last; we recommend a professional.

How many times can a foam roof be recoated?

Many times, as long as the foam stays sound.

Keep reading

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