Project Walk-Through: From Soft Deck to Seamless Roof

The roofs that teach you the most are the ones that show up already leaking. This walk-through follows the kind of job ArmorThane applicators see all the time: an RV with water damage under the old roof, rebuilt and finished with a seamless polyurea membrane.

The starting point

The owner’s complaint is familiar — a ceiling stain that keeps growing no matter how much sealant goes on top. On the roof, the giveaway is a soft area near a penetration. Pressing on it, the deck gives.

That changes the job. You can’t coat over soft decking. Polyurea will seal whatever is underneath it, and wet wood sealed in stays wet.

Opening it up

The damaged section of membrane is cut back until the applicator reaches solid, dry decking on every side. Rotted wood is removed and replaced, and the new deck is fastened down flat and tight. Vent and fixture openings are cleaned up and squared so the membrane can be built around them later.

Prep and prime

With a sound deck, the rest of the roof gets the full prep: old lap sealant scraped out, loose membrane trimmed, everything cleaned and scuffed. Sidewalls, windows and trim are masked. Then the bonding primer goes on — matched to each material on the roof, since a rebuilt section of decking and the original roof surface may need different treatment.

Spraying the membrane

This is the fast part. Using heated, plural-component equipment, the applicator sprays polyurea across the entire roof in one continuous membrane — carried over the edges and built up around every vent and opening. The new and old sections of roof disappear under one surface, with no seam between them.

Within about an hour the membrane is tack-free.

Finishing

A UV-stable topcoat goes over the base membrane. Masking comes off, vents and fixtures are reinstalled, and the roof gets a final inspection. The finish color is the owner’s call — white for a bright, clean look or a darker color that hides road grime.

What the job teaches

• The spray is the shortest step. Inspection, repair and prep take most of the time — and earn the result.
• Repairs and coating are one job. Applicators who can fix a deck as well as spray it can say yes to more roofs.
• Seamless hides the patchwork. A roof rebuilt in sections finishes as one membrane.

You can browse more work like this on our Projects page, or see every step in detail in the ArmorThane RV roof method.