Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
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title: Wood Structural Panel Sheathing
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## Panels with edge swell, delamination, or face checking that exceeds the manufacturer's published acceptance limits shall be rejected.
−## Structural I panels are frequently special-order rather than stocked, particularly in the thinner performance categories. For projects in high-wind or high-seismic zones that require Structural I, the Contractor shall confirm lead time during procurement so that a substitution of standard Rated Sheathing is never made on the basis of availability. {note}
+## Structural I panels are frequently special-order rather than stocked, particularly in the thinner performance categories. For projects in high-wind or high-seismic zones that require Structural I, the Contractor shall confirm lead time during procurement so that a substitution of standard Rated Sheathing is never made on the basis of availability.
## The Contractor shall not substitute standard APA Rated Sheathing where the structural drawings call for Structural I Rated Sheathing.
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## Preservative treatment at sill, rim, and concrete-adjacent panels is routinely omitted from specifications and then from the field. The 8 in. ground-clearance and concrete-contact triggers in IBC Section 2304.12 apply to panels exactly as they apply to lumber. {note}
+## The panel exposure/bond classification shall be specified based on the anticipated moisture exposure during construction and in service.
+
```datasheet
label: Exposure / Bond Classification
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## Minimum panel thickness is set by the framing spacing in IBC 2024 Sections 2304.6 (wall), 2304.7 (floor), and 2304.8 (roof), and prescriptively for dwellings in IRC 2021 Tables R503.2.1.1(1), R602.3(1), and R803.2.1.2(1). For 16 in. o.c. rafters, 15/32 in. is acceptable without edge support and 3/8 in. with H-clips or blocking; for 24 in. o.c. rafters, 15/32 in. is acceptable with edge support or 19/32 in. without. Wall studs at 16 in. o.c. require a 3/8 in. minimum panel per IBC Section 2304.6.1. {note}
−## The 80% residential case is 7/16 in. OSB, Exposure 1, span rating 24/16, over rafters at 24 in. o.c. with H-clips at unsupported edges - the lowest-cost roof sheathing that conforms to IRC R803. The 80% lateral wall case is 7/16 in. Structural I, Exposure 1, fastened with 8d common nails at 6 in. o.c. at panel edges and 12 in. o.c. in the field, which develops roughly 230 to 240 plf nominal unit shear per SDPWS Table 4.3A. The 6 in. o.c. edge spacing default in the Edge Nail Spacing datasheet reflects this common case and also aligns with the prescriptive edge spacing for roof and floor sheathing under IBC 2024 Section 2304 - making it the representative 80% default across all three sheathing applications. For engineered shear-wall or diaphragm schedules that require closer edge spacing, the structural drawings govern via the drawing_ref field. {note}
+## The predominant residential assembly is 7/16 in. OSB, Exposure 1, span rating 24/16, over rafters at 24 in. o.c. with H-clips at unsupported edges - the lowest-cost roof sheathing that conforms to IRC R803. The predominant lateral wall assembly is 7/16 in. Structural I, Exposure 1, fastened with 8d common nails at 6 in. o.c. at panel edges and 12 in. o.c. in the field, which develops roughly 230 to 240 plf nominal unit shear per SDPWS Table 4.3A. The 6 in. o.c. edge spacing default in the Edge Nail Spacing datasheet reflects this common case and also aligns with the prescriptive edge spacing for roof and floor sheathing under IBC 2024 Section 2304 - making it the representative choice across all three sheathing applications. For engineered shear-wall or diaphragm schedules that require closer edge spacing, the structural drawings govern via the drawing_ref field. {note}
## Panel performance category and span rating shall equal or exceed the minimum required for the framing spacing shown on the structural drawings.
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## Nails shall be driven flush with the panel face and shall not be overdriven such that the head fractures the face veneer or strand mat.
−## Overdriven nails are a hidden capacity loss: a nail whose head is sunk below the panel face has reduced edge bearing and the connection no longer matches the tested value behind the SDPWS table. Pneumatic nailers shall be adjusted so heads seat flush, not countersunk. {note}
+## Overdriven nails are a hidden capacity loss: a nail whose head is sunk below the panel face has reduced edge bearing and the connection no longer matches the tested value behind the SDPWS table. Pneumatic nailers shall be adjusted so heads seat flush, not countersunk.
```datasheet
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## Where integrated-WRB sheathing is accepted, all panel seams, fastener heads, and penetrations shall be sealed with the manufacturer's matched flashing tape in accordance with the manufacturer's published instructions and current evaluation report.
−## The defining failure mode of integrated-WRB sheathing is an untaped installation. If the crew installs the panels but skips the seam tape, the laminated overlay no longer functions as a continuous WRB and the wall has an undisclosed air and moisture path - the very function the product was selected to provide is lost. Acceptance of the product is therefore conditioned on the taping being specified, installed, and inspected. {note}
−
```datasheet
label: Integrated-WRB Sheathing
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```
+## The defining failure mode of integrated-WRB sheathing is an untaped installation. If the crew installs the panels but skips the seam tape, the laminated overlay no longer functions as a continuous WRB and the wall has an undisclosed air and moisture path - the very function the product was selected to provide is lost. Acceptance of the product is therefore conditioned on the taping being specified, installed, and inspected. {note}
+
# Testing {toc}
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default: None required
```