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Serving Washington County

Roof Decking Repair in Hillsboro, OR

Replacing damaged roof sheathing in Hillsboro and the towns around it, sheet by sheet, so the new covering sits on a sound deck.

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  • Roof repair and full replacement
  • Moss, wet-season leaks and wind damage
  • Pitched roofs across Washington County

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Decking Repair

Roof Decking Repair: what it covers

Quick answer

Roof decking is the sheathing the covering is fixed to. When it is soft, split or displaced, a roofer replaces the damaged sheets, fixes them to the framing and checks the deck before the covering goes on.

Roof Decking Repair illustration for Hillsboro, OR

The decking is the part of the roof that is seen only when it is opened. It sits under the covering and over the framing, and it carries the nails that hold the shingles. When it is soft or pulled from the rafters, the covering cannot be fixed properly, and the roof is only as good as the deck beneath it.

Moisture is the common cause in this area. The FACTS sheet notes that moss holds water against the covering, and water that stands on or under a damaged covering soaks the wood over months. A windstorm can also lift a section and take the sheathing with it.

This page explains how damaged decking is found, what is replaced and how the job is written up. The decking is priced by the sheet, so the homeowner can see what a hidden problem costs.

Service area
Hillsboro & Washington County
Availability
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Warning signs

Signs you need roof decking repair

Do not walk on soft or exposed decking. Keep the roof closed where the deck is open, and keep the attic clear of anyone who is not working there. The roofer does the deck work with fall protection.

  • Soft spots on the roof that give under foot in a few places
  • Dark staining or swelling on the underside of the sheathing
  • Nails pulled through the sheathing or loose in the deck
  • Sheathing edges lifted or separated where sheets meet
  • Daylight through the deck from the attic after a windstorm
  • A ridge or rafter line that dips along its length
Our process

How our roof decking repair visit works

  1. Check the deck from the attic

    The underside of the sheathing is checked for staining, soft wood and daylight. Each damaged area is marked and counted on the framing.

  2. Open the covering where the deck is suspect

    The covering is lifted only in the marked areas, so the roof is not stripped more than the repair needs.

  3. Test the sheets and the nails

    Each sheet is pressed and checked for softness. Nails are tested for pull, and any failed sheet is marked for replacement.

  4. Replace the damaged sheets

    Damaged sheets are cut out and replaced with new sheathing, fixed to the framing with the nail pattern the covering maker specifies. The job is priced per sheet.

  5. Record the deck and proceed

    The record lists each sheet replaced by position and reason, and photographs are taken before the covering goes back on.

How is the damage found before the covering is removed?

From the attic. The underside of the sheathing shows staining, soft wood and daylight, which tells the roofer where to look.

The attic is the best place to start. Water that has soaked the sheathing shows on its underside as dark staining, and soft wood gives under a probe. Daylight through the deck is a clear sign of a failed sheet. The roofer marks each area and matches it to the roof above.

A roof with decking damaged in several places needs more than local work, and the roofer says so in the record.

  • Staining and soft wood on the underside
  • Daylight through the deck
  • Marks matched to the roof above

How does moisture reach the deck?

Through lifted tabs, cracked shingles, open joints and moss that holds water against the covering, so the wood stays damp for long periods.

Moss and debris hold water against the covering, and water finds its way under lifted tabs and through cracked shingles. Once it reaches the sheathing the wood stays damp through long wet spells, and it softens. A deck that stays wet for months is the one most likely to need replacement.

The moss record and the decking record belong together, so the roofer can see where the wet has been held.

  • Lifted tabs and cracked shingles let water in
  • Moss holds water against the surface
  • Long damp periods soften the wood

Can new covering go over damaged decking?

No. A new covering over a soft deck fails at the damaged points, because the nails have nothing sound to hold.

A covering is only as sound as the deck under it. A new covering laid over a soft or split sheet will not hold its nails, and the first strong wind lifts the new work at the same points. The damaged sheets are replaced first, and the quote says so.

A homeowner offered a new covering without a deck check should ask for the check in writing before agreeing.

  • Nails do not hold in soft wood
  • Replace the damaged sheets first
  • Ask for the deck check in writing

What belongs in the decking record?

The sheets replaced by position and reason, the framing repairs, and the photographs taken before the covering went on.

A decking record lets the next roofer and the insurer see what was done under the covering. Photographs taken before the covering goes back on are the most useful part, because the deck is hidden afterwards.

Keep the record with the roof file and with any storm inspection.

  • Each sheet by position and reason
  • Framing repairs with photographs
  • Photographs before the covering goes back on

How long does a deck stay wet, and why it matters

A deck that stays damp for weeks at a time begins to lose its strength, and the nails lose their grip. The attic check shows how long the wet has lasted.

Wood that is wet for a few days dries and recovers. Wood that stays wet for weeks softens, and the nails that hold the sheathing lose their grip. The roofer reads the wood from the attic: dark, soft or blackened wood points to long wetting, and clean wood with a light stain points to a short episode.

That reading decides how far the replacement goes. A deck with a short episode may need only a few sheets, and a deck with long wetting across a slope may need the whole slope renewed, and the scope says which.

  • Dark or soft wood points to long wetting
  • Light staining points to a short episode
  • The reading sets how many sheets are replaced

Replacing a sheet without disturbing the rest

The damaged sheet is cut back to the nearest rafter, the new sheet is fixed to the rafter and the joins are staggered so the new sheet sits over a sound edge.

A single sheet is replaced by cutting it back to the nearest rafter, so the new piece is fixed to firm framing on each side. The joins are staggered, so no two joins line up across the slope, and the edges are sealed where the covering requires it.

The roofer records the sheet's position and the fixing pattern, so the next roofer can see the repair and its method.

  • Cut back to the nearest rafter
  • Stagger the joins across the slope
  • Record the position and the fixing pattern
Options

Types and options for roof decking repair

Spot sheet replacement

Replacing one or a few sheets where the damage is local, usually found from the attic.

Slope-wide decking renewal

Replacing the decking across a slope where the damage is widespread.

Framing repair under the deck

Repairing or strengthening rafters and joists found damaged beneath the deck.

Washington County

Why roof decking repair is different in Portland metro

The FACTS sheet gives no sourced housing age for Hillsboro, so this page does not state how old the decking on local roofs is likely to be.

Decking under trees in the Coast Range foothills is checked for moisture more often, and the roofer sets that check interval on the record.

Decking repairs in the Portland-side towns follow the same scope, and the travel is shown on the quote.

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If it's an emergency, call now. For non-urgent roof decking repair, send the form and we'll call you back.

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Where we work

Roof Decking Repair across Washington County

Not sure if you're covered? Check your ZIP code.

Related

Full Roof Replacement

Replacing a whole roof in Hillsboro and the towns around it, from tear-off to the final flashing, quoted line by line on site.

Shingle Roof Repair

Repairing asphalt shingles in Hillsboro and the towns around it: lifted tabs, cracked shingles and edges that moss has loosened.

Moss Removal and Roof Cleaning

Cleaning moss and algae off roofs in Hillsboro and the Washington County towns around it, done carefully so the covering is not damaged.

Guides

Read before you book

FAQ

Roof Decking Repair FAQs

Can the deck be repaired without taking the roof off?

Often, if the damage is local. The covering is lifted only where sheets are replaced.

How do I know if my deck is damaged?

Look at the underside from the attic for staining, soft wood and daylight. Only a roofer's deck check is a sure test.

Is decking repair covered by insurance?

That depends on the policy and the cause. The record helps any claim, and the insurer decides.

Does the deck repair change the roof price?

Yes. The replaced sheets are a separate line on the quote, counted and confirmed before the work.

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