Roof Decking and Rotted Wood Repair in Little Rock, AR

Signs your roof decking has rotted

Decking trouble shows up on the roof surface, along the roofline and in the attic. You can check two without a ladder.

From the yard

• A sagging line or shallow dip between rafters, easiest to spot in low morning or evening light
• Shingles that look wavy or sunken over one patch while the rest of the slope lies flat
• Gutters pulling away from a soft fascia board, or paint peeling and flaking along the eaves

In the attic

• Dark stains, black streaks or white mineral rings on the underside of the boards or panels
• Plywood or OSB that is swollen at the edges, peeling in layers or crumbling around nails
• Rusty nail tips, or pinpoints of daylight where there should be none
• A musty smell, or mildew on the sheathing and rafters by late summer

Underfoot

A roofer walking the slope often feels a springy spot before anything shows below. If you find one while cleaning gutters, step off and stay off. Our guide to the signs of rotted roof decking goes through each warning sign in more detail.

What causes decking rot: slow leaks, poor ventilation and humidity

Wood decking rots when it stays damp long enough for fungi to take hold. In Little Rock that moisture arrives from two directions: rain getting in from above and humid air condensing from below.

Slow leaks from above

The worst rot usually sits under a small leak that never reached a room. A cracked pipe boot, a gap in chimney step flashing or a valley packed with oak leaves can wet the same patch of decking every heavy rain for years while the ceiling stays clean. Stopping that source is part of the job, through roof leak repair or flashing and chimney leak repair.

Moisture from below

A poorly ventilated attic holds the damp air of an Arkansas summer, and on cold nights that moisture condenses on the underside of the decking. Ventilation rot tends to show as a broad stain near the ridge or on the north slope, not one wet spot. Bathroom fans that blow into the attic make it worse.

Mold, stains or rot? Reading the underside of the decking

Dark marks on the attic side of the roof worry a lot of homeowners, but not every stain means the wood has to come out. The first question the roofer answers is simple: is the wood still firm?

• Firm wood with surface mold or staining. An awl will not sink in and the plies hold together. The sheathing is usually still sound. The repair is stopping the moisture, and the mold is cleaned or treated rather than the deck torn out.
• Soft, punky or layered wood. The tip sinks in easily, plies peel apart or the surface crumbles around nails. That section has lost its strength and gets replaced.

The pattern points to the source

• A broad, even darkening near the ridge or across the north slope usually means condensation in an attic that holds damp air.
• A dense patch right above a bathroom fan, range hood or dryer line usually means that duct ends in the attic instead of outdoors.
• A narrow stain running downhill from a vent pipe, chimney or valley usually means a leak above it.

On decking, mold is mostly a warning that the wood has been staying wet. The EPA's home mold guidance says homeowners can usually handle areas smaller than about 10 square feet themselves and should follow its fuller guidance for anything larger, so where growth is widespread the roofer may suggest a mold specialist alongside the roof work.

How a decking repair works: open the section, replace the sheathing, re-shingle

A decking repair is a small tear-off and rebuild of one area of the roof. On most homes it follows the same order:

1. Map the damage. The roofer walks the slope and checks the attic to see where the soft wood starts and stops.
2. Strip the shingles and underlayment over that area plus a margin of sound roof.
3. Cut out the rotted wood back to the center of the nearest solid rafters, so the new piece has framing to fasten to on both sides.
4. Check the framing. Rafters under the opening are probed. Minor softness is sistered with new lumber; anything structural is flagged first.
5. Install new sheathing of matching thickness, gapped slightly at the edges so it can swell in humid weather without buckling.
6. Dry it in and re-shingle. New underlayment goes down, then shingles woven into the existing roof, with flashing reset wherever the repair meets a wall, chimney or vent.

Many single-area repairs are done in one day of dry weather. Our missing and damaged shingle repair page explains how new shingles are blended into a sun-faded roof.

Decking thickness, rafter spacing and edge clips

A patch only works if it matches the deck around it. A thinner sheet leaves a dip the shingles show, and a thicker one leaves a ridge. Before buying material, the roofer measures the old sheathing at the cut edge and checks how far apart the rafters or trusses sit.

What Little Rock roofs are usually built with

• Panels: most homes from the 1970s on have 7/16-inch OSB or 1/2-inch plywood, and some have 5/8-inch plywood.
• Framing: rafters or trusses are usually set 16 or 24 inches apart. At 24 inches a thin panel spans a long way unsupported, which is why some roofs with 3/8-inch sheathing dip between rafters even when the wood is dry.
• Boards: older plank decks are usually 1-by lumber, about 3/4 inch thick, so a plywood insert often needs a thicker panel or shims to sit flush.

How the new sheathing goes in

• Metal H-clips support panel edges that fall between rafters, which matters most at 24-inch spacing.
• Shingle nails need about 3/4 inch of solid wood, or must pass all the way through a thinner panel, so the patch has to be sound through its full depth.

Plywood or OSB for the patch?

Both work when they are gapped, fastened and covered quickly. They behave differently when wet: OSB tends to swell at the edges and stay swollen after it dries, which can show as raised lines under the shingles, while plywood swells more evenly and mostly settles back. Many swollen edges start with sheets butted tight, so the roofer leaves a small gap and usually matches what is already on the roof.

Plank decking on older homes vs plywood and OSB

What sits under your shingles depends mostly on when the house was built, and it changes how the repair is done.

Board decking around dormers and chimneys on a steep Heights roof takes slow hand work; an open plywood slope in Chenal Valley goes faster, and the estimate reflects it.

How much decking gets replaced, and what makes a repair grow

On most repairs the answer is a few boards or a sheet or two around the leak. The roofer estimates the size from the attic and the roof walk, but the true edge of the rot only shows once the shingles are off. A repair grows when:

• The rot runs past the stain. Water travels along the top of the deck under the underlayment, so soft wood often reaches beyond what showed in the attic.
• Rafters are soft too. Rotted framing under the opening is sistered or repaired before new sheathing goes on.
• Nails will not hold. Wood that looks fine but is too soft to grip a nail is cut back as well, because shingles fastened into it can let go in the next strong wind.
• Old boards have wide gaps. Some wood-shingle-era decks were laid with spaces between boards, and shingle makers commonly call for a solid overlay of at least 3/8-inch plywood or OSB once gaps run past about 1/4 inch. The roofer fills the repair area solid; covering a whole gapped slope is a separate decision.

If the opened area turns out larger than expected, the roofer stops and shows you the soft wood, with photos, before cutting further.

Fascia, soffit and eave rot

Every drop leaves the roof at the eaves, so rot often starts there. Clogged gutters overflow behind themselves, a missing drip edge lets water wick into the trim, and the lowest row of decking sits right above both.

• Fascia board: the trim board the gutter hangs on. Soft, split or peeling fascia is cut out and replaced, and the gutter is rehung on solid wood.
• Soffit: the underside of the overhang. Stained or sagging soffit usually means water has run behind the gutter, and a rotted panel lets squirrels in.
• Rafter tails: the rafter ends that carry the overhang. On older homes with exposed tails, a few may need sistering where they have gone soft.
• Drip edge: the metal strip at the roof edge that holds water off the fascia. Adding or replacing it belongs in any eave repair.

Under the oaks and pines of older Little Rock streets, gutters fill quickly every fall and again in spring. Keeping them clear is the simplest way to protect new eave wood once the repair is finished.

Attic ventilation fixes that stop rot from coming back

If moisture from below caused the rot, new decking alone will go the same way in a few years. Balanced ventilation pulls outside air in low at the soffits and lets it out high at the ridge, keeping the attic closer to outdoor temperature and humidity.

• Open the intake. Insulation blown over the soffit vents is common. Baffles hold it back so air can enter.
• Add exhaust up high. A ridge vent or correctly sized roof vents let hot, damp air escape.
• Avoid mixing exhaust types. A ridge vent next to a gable fan or extra box vents can short-circuit the airflow, pulling air from the nearest opening instead of the soffits.
• Send fans outdoors. Bathroom and dryer ducts that end in the attic get rerouted through a roof or wall cap.

The roofer sizes the vent area to your attic.

What affects roof decking repair cost

Decking work is priced after the roofer sees the roof and the attic, because rot usually runs further than the ceiling stain suggests. Our shingle roof repair cost guide for Little Rock covers general pricing factors. For decking, these matter most:

• How much wood is rotted, counted in sheets or square feet once the shingles are off
• Decking type: matching old boards takes more labor than dropping in a plywood panel
• Pitch, height and access: a steep two-story roof needs more safety setup than a low ranch
• Old shingle layers that must come off before the deck can be reached
• Framing repairs to rafters, the ridge board or rafter tails found under the opening
• Eave work on fascia, soffit and drip edge
• Ventilation changes such as a ridge vent, baffles or rerouted fan ducts
• Shingles needed to blend the patch into the rest of the roof

Hidden rot can turn up once the old wood is open, so ask how extra sheets would be handled before the job begins. The roofer gives you a written estimate before work starts.

Why Little Rock homeowners call Little Rock Shingle Roofers for decking repair

• ✓Licensed, insured roofersEvery roofer we send is licensed and insured in Arkansas. Little Rock Shingle Roofers connects you with independent licensed roofers who perform the work.
• ✓A written estimate firstThe roofer prices what can be seen, explains how hidden rot would be handled and puts it in writing before anyone pulls a shingle.
• ✓Only the bad section is openedA few rotted sheets call for a section repair. The roofer opens what needs opening and leaves sound roof alone.
• ✓Someone answers any hourFound a soft spot on a Sunday evening? Phones are answered 24/7, so you can report it right away and get a roofer scheduled.