Replace a Small Section of Roof Decking and Shingles

A. Finished-Work Specification

Deliverable: one repaired roof section consisting of a replacement sheathing panel fastened to sound framing or approved blocking with full edge support, self-adhered membrane and synthetic underlayment restored with laps integrated beneath existing upper layers and over existing lower layers, any disturbed drip edge, valley, wall, or penetration flashing reinstalled, replacement shingles installed at the original exposure, offset, fastening, and sealing requirements, and a documented inspection and closeout record.

B. Governing Documents

Document	Confirmed Current	Notes
Approved repair scope
Deck specification / sheathing schedule
Framing plan
Roofing-system instructions
Weather plan
Inspection requirements

C. Acceptance Standards

Check	Standard
Scope confirmation	Damage confirmed as sheathing-only, or framing/environmental direction obtained before proceeding
Repair boundary	Shingle, underlayment, and flashing removal extends beyond the damaged panel far enough to create proper laps on reinstallation
Cut depth	Set to deck thickness only; no cuts into framing or concealed services
Exposed framing	Sound bearing, no decay, splitting, misalignment, moisture, or connection defects, or corrected under an approved detail before panel installation
Replacement panel	Matches specified material, thickness, orientation, and edge gap; every joint lands on approved framing or added blocking with full support
Fastening	Matches the approved edge and field fastening schedule; fasteners fully seated
Membrane and underlayment	Laps extend beneath existing upper layers and over existing lower layers with no reverse laps
Flashing	Disturbed drip edge, valley, wall, or penetration flashing reinstalled to the governing chapter's original detail
Shingles	Original exposure, offset, fastening, and sealing requirements matched; color and lot blended with surrounding field where available
Documentation	Removed material, framing condition, repair components, concealed work, and inspection results recorded

D. Required Project Sequence

1. Obtain the approved repair scope, deck specification, framing plan, sheathing fastening schedule, roofing-system instructions, weather plan, and inspection requirements. Confirm the revision or date on each document and record the confirmation on the governing-documents table above.
2. Determine whether damage involves only sheathing or also rafters, trusses, blocking, fascia, insulation, mold, wiring, chimneys, or other systems. Base this determination on the Chapter 1, Chapter 17, or Chapter 18 findings that identified this repair, and on a visual inspection of the area from an approved position before cutting.
3. Stop work and obtain structural or environmental direction for framing damage, widespread decay, mold, fire damage, asbestos-containing material, or an unstable roof. Do not proceed with this chapter's sheathing-replacement procedure until that direction authorizes it.
4. Establish fall protection, interior protection, debris containment, temporary weather protection, and below-roof exclusion zones. Extend the site's existing roof-access and fall-protection system to cover the open repair section for its full duration.
5. Mark the repair limits so replacement-panel edges land on approved framing or added blocking. Identify the framing members bordering the damaged area and mark the cutline directly over them rather than at the visible edge of the damage alone.
6. Locate hidden framing, fasteners, wiring, ducts, pipes, and penetrations before cutting. Use the attic or interior access to confirm framing spacing and any concealed services before marking the final cutline on the roof surface.
7. Remove shingles beyond the repair boundary far enough to create proper underlayment and shingle laps. Work from the repair boundary outward using the approved shingle-removal method, keeping cutoffs and loose fasteners contained.
8. Preserve reusable shingles only when product condition and repair instructions permit. Set aside shingles suitable for reinstallation and discard any that are cracked, brittle, torn, or otherwise unsuitable.
9. Remove underlayment and flashing in controlled layers while documenting the original failure. Photograph the condition of each layer as it is exposed, before removing the next, to preserve a record of the original cause.
10. Set saw depth to the deck thickness and cut the damaged sheathing without cutting framing or concealed services. Verify the depth setting against the sheathing schedule before making the first cut, and recheck it if the blade encounters unexpected resistance.
11. Remove the damaged panel section and all unsafe fasteners and debris. Pry the panel free without levering against adjoining sound sheathing, and remove protruding fasteners from the exposed framing.
12. Inspect exposed framing for bearing, decay, splitting, alignment, moisture, and connection condition. Compare the exposed condition to the framing plan and record any deviation before proceeding.
13. Install approved edge blocking or repair framing only according to the controlling detail. Do not add blocking or framing beyond what the approved detail specifies, and confirm bearing and fastening for any added member.
14. Cut replacement sheathing to the specified material, thickness, orientation, edge gap, and support condition. Match the panel to the deck specification confirmed in Step 1, including the required spacing gap at panel edges.
15. Dry-fit the panel and verify full edge support and required spacing. Confirm that every edge of the replacement panel bears on framing or approved blocking before fastening.
16. Fasten the replacement sheathing using the approved edge and field schedule. Use the fastener type, length, and spacing identified in the sheathing fastening schedule confirmed in Step 1.
17. Verify panel plane, framing contact, fastener seating, and absence of unsupported edges. Check the panel surface against adjoining sheathing for a flush plane and confirm every fastener is seated flush without overdriving.
18. Install self-adhered membrane or underlayment patches with laps extending beneath upper existing layers and over lower layers. Follow the Chapter 4 and Chapter 5 lap and adhesion requirements for the membrane and underlayment products in use.
19. Reinstall required drip edge, valley, wall, or penetration flashing disturbed by the repair. Follow the governing chapter for each flashing type — Chapter 3 for edge metal, Chapter 9 for valley flashing, Chapter 10 or 11 for wall flashing, Chapter 12 for penetration flashing — to restore the original detail.
20. Install replacement shingles using the original exposure, offset, fastening, and sealing requirements. Match the surrounding course lines established before the repair and blend replacement shingles for color and lot where available, following Chapter 7 and Chapter 8 methods.
21. Hand-seal disturbed surrounding tabs where required. Apply compatible hand-seal adhesive at the manufacturer-required tab locations disturbed by the repair, following the Chapter 17 sealing method.
22. Inspect the repair from the attic and roof for deck plane, support, fasteners, laps, shingle alignment, and drainage continuity. Confirm every item on the Acceptance Standards table before considering the repair complete.
23. Conduct the approved local water-path observation when conditions permit. Perform the observation under safe weather conditions and record the result without representing it as a whole-building leak test.
24. Document removed material, cause of damage, framing condition, repair components, concealed work, and inspection results. Compile the photographs from Steps 9, 12, 16, and 18 with the completed repair record before closing out the project.