Roof Repair for Eastvale, California

We start on the roof with a visual pass over every penetration, looking for sealant that has cracked, shrunk away from a flange, or been applied over dirt so it never bonded. Then the whole surface gets walked and felt for softness underfoot, since a spongy area means the decking below has been wet long enough to lose strength. Soft areas are outlined so the pattern can be compared against what shows inside.

From inside the coach, ceiling panels and upper cabinet interiors are inspected and metered. Where the picture is still unclear, we run a controlled water test in sections, working from the low side upward with someone inside watching, which is the only way to isolate a path that travels before it drips. Thermal imaging helps on larger units by showing temperature differences where insulation has absorbed water. None of that guessing is necessary once the map and the test agree.

Old sealant comes off completely. That means plastic scrapers, the correct solvent for the membrane type, and patience, because self-leveling lap sealant applied over cracked old sealant bonds to the old material rather than the roof. Once the flange and membrane are clean and dry, the joint is rebuilt from the correct products: butyl tape under the flange if the fitting has to come up, then self-leveling sealant on horizontal surfaces and non-sag on vertical.

Product selection is where a lot of do-it-yourself work goes wrong. Silicone is the worst offender because nothing will bond over it later, including the next repair. Roof-specific self-leveling sealant such as the Dicor product family is formulated to stay flexible through thermal cycling and to be compatible with rubber membrane. On TPO and PVC roofs the compatible products differ, and using the EPDM formulation on a thermoplastic roof causes adhesion problems.

A clean puncture in EPDM gets cleaned, primed with the manufacturer primer, and covered with a bonded rubber patch that extends well past the damage in all directions. Tape-only repairs have their place as a temporary measure but they are not the durable answer on a membrane that will see decades of expansion. On TPO the better repair is heat welding a matching patch, which produces a joint as strong as the sheet itself.

Fiberglass roofs get a laminate repair: grind a taper around the damage, lay in cloth and resin to full thickness, fair the surface, and refinish with gelcoat or paint. Seam failures on any material mean investigating why the seam moved. Usually it is decking flex from a soft spot or a fastener that backed out. Rebonding the seam without correcting the movement underneath simply hands the problem forward a few months.

If the roof flexes underfoot more than a quarter inch or so, or if a probe sinks into the decking at the edge of a penetration, that plywood or lauan is done. Wet decking never recovers, it delaminates internally and loses fastener holding power, which is why air conditioners on rotted decking start leaking around their gaskets even after the gasket is replaced. The material has to be removed. There is no coating or sealant that substitutes for that step.

The membrane is peeled back over the affected area, the bad decking is cut out to sound material and dry framing, new decking of matching thickness is fastened in, and the membrane is bonded back down and its seam properly treated. On a small area this stays a repair. Once the soft region covers a substantial share of the roof, replacing the membrane wholesale becomes better value, and we will say so rather than selling patchwork.