Jacksonville, FL ยท Roof Repairs
Roof decking and sheathing repair in Jacksonville
Updated September 2026
The deck is the layer everything else is nailed to. When it goes soft, shingles pop, flashing tears and the next storm has an easier time. We replace what is rotted and fasten the rest properly.
- Calls answered 24/7
- Plywood and plank decks
- Re-nailed to current code
Roof decking repair in Jacksonville, FL replaces rotted or delaminated sheathing and re-nails the remaining deck to the Florida Building Code 8th Edition the city enforces. It usually happens during a reroof, when the deck is exposed; a soft spot under an otherwise sound roof can be opened, repaired and closed as a section repair.
Under the shingles
Why decking fails on Florida roofs
Decking fails from water it was never meant to see. A slow leak at a pipe boot or valley soaks the plywood for months before a ceiling stain shows, and a humid, poorly vented attic adds moisture from below. Plywood delaminates; OSB swells at the edges and loses its grip on nails.
Fastening is the other half. Older decks were often nailed at spacings that fall short of today's wind requirements, which is why we re-nail the deck on every reroof, and why deck attachment is one of the items a wind mitigation inspection records.
Cost factors
What decides the cost of decking work
How much is rotted
Decking is priced per sheet or per board, so the number settles once the old roof is off.
Plank or plywood deck
Plank decks may need boards replaced or a full plywood overlay, which is more material.
Framing damage
Sistering a rafter or adding blocking is carpentry on top of the decking.
Reroof or section repair
Decking done during a reroof shares the tear-off; a standalone section repair carries its own.
Ask any roofer for a written per-sheet price before tear-off. The figure above is a published local range, not our quote.
Roof Decking Repair
Rotted plywood sheathing replacement
Rotted sheathing is cut back to sound wood and replaced with new plywood of the same thickness, fastened to the rafters on the pattern the code requires. We extend the cut to the nearest rafters so the new sheet is supported on both edges, and we find the leak that caused the rot before closing up, because new plywood under an old leak is a repair that fails twice.
In the attic, stained rafters and wet insulation near the damage get checked too.
Typical market range for rotted decking replacement found during repair: $50 to $80 per sheet (source). A planning figure, not a quote.
Roof Decking Repair
Plank decking repair on older homes
Homes built before plywood was common sit on 1x6 or 1x8 board decking. Plank decks are often sound, but the gaps between boards and the old nail holes do not hold modern fasteners well. Depending on condition, we replace damaged boards in kind, or sheathe over the planks with plywood so the new roof has a continuous nailing surface.
On a house in a historic district, sheathing over the planks keeps the original boards in place and changes nothing visible from the street.
Roof Decking Repair
Deck re-nailing to current code
Re-nailing adds fasteners to an existing deck so it meets the current nail type and spacing for Florida wind loads. It is done while the deck is exposed during a reroof, row by row across every sheet, with ring-shank nails where the code or the wind mitigation form calls for them.
It is inexpensive on a roof you are already paying to replace, and deck attachment is one of the items recorded on Florida's wind mitigation inspection form. The wind mitigation page covers that paperwork.
Roof Decking Repair
Sagging roof section repair
A dip between rafters or along a ridge can mean more than a soft deck. It can be rotted sheathing, a cracked or undersized rafter, or a load the framing was never built for, such as tile or a second layer of shingles on a house framed for one. We find out which from the attic before quoting.
Deck-only sags are repaired with new sheathing and blocking. Framing problems get sistered rafters, or an engineer's sign-off first when the permit will ask for one.
What is included
What a decking repair from us covers
- Attic inspection of the deck underside and rafters
- Removal of roofing to sound deck around the damage
- Tracing and fixing the leak that caused the rot
- Rotted sheathing cut back to the nearest rafters
- New plywood of matching thickness on supported edges
- Plank boards replaced in kind or overlaid with plywood
- Re-nailing of the remaining exposed deck to current spacing
- Photos of the repaired deck before it is covered
- New underlayment and roofing tied into the existing roof
Step by step
How a decking repair runs
- 1
Attic look first
Stains, daylight and sag are easier to read from below.
- 2
Open the section
Roofing removed to sound deck on every side of the damage.
- 3
Find the cause
The leak source is traced before anything new goes in.
- 4
Replace and fasten
New sheathing on supported edges, nailed to code.
- 5
Re-nail the rest
Remaining sheets fastened to current spacing while exposed.
- 6
Close up and photograph
Photos of the deck, then new underlayment and roofing.
Roofing in Jacksonville
Where old plank decks are common in Jacksonville
The deck under a Jacksonville roof depends heavily on when the house was built. In Riverside and Avondale, where most homes are craftsman bungalows, Tudor revivals and prairie-style houses from 1900 to 1940, original plank decking is common, so a reroof there often means repairing boards or sheathing over them. Newer subdivisions sit on plywood or OSB. Either way the repair is built to the Florida Building Code 8th Edition, which the city has enforced for permits since January 2024.
What to look for
Signs the decking under your roof is failing
Soft or spongy spots underfoot
A deck that gives when walked is delaminating or rotted.
A visible dip in the roofline
Sag between rafters points to deck or framing trouble.
Nail pops across a slope
Fasteners backing out of wet wood lift the shingles above them.
Dark, stained wood in the attic
Stains on the underside of the deck mark an old or active leak.
Daylight between boards
On plank decks, gaps you can see through are gaps water can come through.
Questions we hear
Roof decking questions
Partly. The attic shows stains and daylight, and soft spots show underfoot. The full count only comes when the old roof is off, which is why a per-sheet price should be agreed in writing beforehand.
Not automatically. Sound planks can stay, repaired in kind or sheathed over with plywood for a continuous nailing surface.
It brings the exposed deck up to current code, and documented deck attachment is one of the items a wind mitigation inspection records.
Yes, as a section repair: the roofing over the damage comes off, the deck is fixed, and the section is re-roofed and tied in.
Attic moisture. Poor ventilation in Jacksonville's humidity can wet the deck from below. See roof ventilation.
Related work
Other roof repairs we handle in Jacksonville
Shingle Roof Repair
Covers missing and blown-off shingle replacement, lifted and creased shingle repair, ridge cap repair.
See how it worksMetal Roof Repair
Covers backed-out fastener and washer replacement, standing seam leak repair, rust and coating failure.
Read the detailsTile Roof Repair
Covers cracked and slipped tile replacement, underlayment failure under tile, ridge and hip mortar repair.
Learn moreGet the soft spot opened up before the next storm
Call any hour. We repair plywood and plank roof decks across Jacksonville and answer 24/7.
