Rotten Patio Repair

Because "exterior-rated" describes the wood, not the design — and pergola design is unusually good at defeating good lumber. A pergola is a lattice of horizontal members: beams notched over posts, rafters notched over beams, purlins over rafters. Every one of those notches and overlaps is a flat-bottomed pocket where rainwater sits, shaded from the sun that would dry it. Treated and rot-resistant lumber slows decay; it doesn't survive permanent puddles, especially at cut ends and notches where cutting exposed untreated core and open end grain. Add fasteners that channel water into bolt holes, and posts whose bases meet the patio slab in a splash zone, and the timeline writes itself: eight to fifteen years in, the joints go punky while the long clear spans between them stay sound. That split — rotten joints, healthy spans — is exactly why repair beats demolition on most pergolas we assess. The structure isn't failing; its pockets are.

The water tells you: everything that holds it, fails. First to go are the joint pockets — the notches where rafters cross beams and beams seat over posts, each one a small reservoir after every rain. Close behind come post bases, standing in splash-back on the slab and wicking through end grain, particularly posts set directly on concrete without a standoff. On solid-roof patio covers, add the ledger and flashing line where the cover ties into the house — a failed flashing there quietly feeds rot into both the cover and the house wall — and the fascia and outer beam edges, which catch runoff from the roofing. Horizontal top rails and built-in benches round out the list. What fails last, or never, is the long clear lumber between joints. Photograph the notches, the post bases, and the ledger line and text them to (973) 564-0958 — those three shots usually tell us the same day whether you're looking at repair or rebuild.

Almost always repaired — the same structural playbook we use on porch columns scales directly to patio structures. A rotted post base gets the classic treatment: the span above is temporarily supported, the decayed section is cut back to sound wood, and a matched section is spliced in with proper bearing — set on a standoff detail this time, so end grain no longer touches wet concrete. A beam rotted in its seat or notch is repaired in place where fiber survives, using penetrating epoxy consolidation to re-harden the pocket, or has the decayed length cut out and a new section spliced and reinforced where it doesn't. Rafters and purlins, being smaller and numerous, are sometimes more economical to replace individually in kind — we'll tell you honestly when that's the case. Full demolition earns its place only when decay owns most joints at once on an undersized frame. Every repair carries our 5-year workmanship warranty, and the estimate names the method member by member.

The rebuild has to outsmart the design, not just renew the wood — so every repair includes correcting the details that trapped water in the first place. Repaired notches and seats are shaped and sealed so they shed instead of pool: end grain gets flooded with penetrating sealer, joint pockets get pitched or capped, and metal flashing goes over the water-catching horizontals where it belongs — a detail most original builds skipped. Post bases are re-set on standoffs above the slab. Then comes the finish system, which on an exposed structure is not cosmetic: primer and paint or penetrating exterior finish on every surface, including the cut ends and undersides nobody sees, renewed as maintenance thereafter. Cured epoxy repairs themselves are essentially rot-proof — the fungus can't digest them — so the vulnerable zones are the original wood around them, and that's exactly what the drainage details and finish protect. That combination is what lets us stand behind exposed outdoor work with a 5-year workmanship warranty.

Repair prices track the members that failed, not the structure's footprint — which is why the numbers land so far below replacement. Demolishing and rebuilding a pergola or patio cover is a five-figure project once posts, framing, roofing, and finishing stack up; splicing two post bases, consolidating the beam seats, and reflashing a ledger is a different universe of cost, typically about 80% less. Our written estimate shows both figures side by side, per our standard practice, so the keep-or-rebuild decision is made with real numbers. Timeline runs on our usual rhythm: photos of the joints and post bases answered the same day; onsite assessment within 1–2 days, where we probe every joint pocket and check the ledger; repairs complete within 1–2 weeks of approval, usually two to four working days on site depending on how many members are involved. Refinishing adds finish-cure days at the end. Fully insured crew, Mon–Fri 8:00 AM – 6:00 PM.