Framing and Rough Carpentry (C-5) · Lesson 5 of 5

Shear Wall Fastening: Edge and Field Spacing, Fastener Counts, and 3x Framing

"Shear Wall Fastening: Edge and Field Spacing, Fastener Counts, and 3x Framing" is lesson 5 of 5 in the Framing and Rough Carpentry (C-5) Learning Hub. It opens with "What a Shear Wall Does and Where the Strength Comes From" and works through 5 short steps, then a worked example you can check yourself against.

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Steps in this lesson

  1. What a Shear Wall Does and Where the Strength Comes From
  2. Reading CBC Table 2306.3(1): Edge Spacing Sets the Capacity
  3. Counting Fasteners for a 4x8 Panel
  4. Why Tight Edge Spacing Brings 3x Framing (Table 2306.3(1) Notes d, f and g)
  5. Installing It So the Fasteners Count

The worked example in the course applies this lesson to a realistic job in 6 steps, from "Edge staples" through "Staples per panel, then the whole wall".

What you'll be able to do

  • Explain the main idea of "Shear Wall Fastening: Edge and Field Spacing, Fastener Counts, and 3x Framing" in plain language you can use on the exam.
  • Apply this step with confidence: "Counting Fasteners for a 4x8 Panel".
  • Apply this step with confidence: "Why Tight Edge Spacing Brings 3x Framing (Table 2306.3(1) Notes d, f and g)".
  • Apply this step with confidence: "Installing It So the Fasteners Count".
  • Test yourself on the worked example and the quick-check quiz inside the classroom.
Shear Wall Fastening: Counting a 4x8 Panel4x8 PANEL, VERTICAL 72 edge staples 4 in. o.c. on all 4 edges 14 field staples 12 in. o.c. on 2 studs Studs 16 in. o.c. every edge on framing STAPLE COUNT, 16 GA. AT 4 IN. / 12 IN. Perimeter 2 x (96 + 48) = 288 in. Edge staples 288 / 4 = 72 Field: 2 studs x 7 staples = 14 Per panel 72 + 14 = 86 24 ft wall: 6 x 86 = 516 staples Staples per panel (and allowable shear) 6 in. = 62 (185 plf)4 in. = 86 (280 plf) 3 in. = 110 (375 plf)2 in. = 158 (475 plf) (field staples stay 14 in every case; 15/32 in. Structural I) 516 staples for six panels at 4 in. edge / 12 in. field = 6,720 lb 2 in. edge: 3x framing at panel edges (Table 2306.3(1) notes d and g) Fastener size and spacing come from the plan's shear wall schedule Source: 2025 CBC Section 2306.3 and Table 2306.3(1), 15/32 in. Structural I panelsCC
The diagram for this lesson, exactly as it appears in the Learning Hub.

The first steps of this lesson

Step 1: What a Shear Wall Does and Where the Strength Comes From

A shear wall is a framed wall covered with wood structural panels (plywood or OSB) that keeps the house from racking sideways in an earthquake or high wind. The panel itself is strong; the strength of the wall comes from the fasteners that transfer force between the panel and the framing. 2025 CBC Section 2305.1 says structures using wood shear walls or diaphragms to resist wind or seismic loads shall be designed and constructed in accordance with AWC SDPWS and Sections 2305, 2306 and 2307. Section 2306.3 adds that where panels are fastened with staples, the allowable shear values in Tables 2306.3(1), 2306.3(2) and 2306.3(3) are permitted, and that the values in Tables 2306.3(1) and 2306.3(2) may be increased 40 percent for wind design. The SDPWS nailed-wall values themselves are not reproduced in the code book, so the engineer's shear wall schedule on the plans is what tells you the fastener, the spacing and the capacity.

Step 2: Reading CBC Table 2306.3(1): Edge Spacing Sets the Capacity

Table 2306.3(1) gives allowable shear in pounds per foot (plf) for wood structural panel shear walls on Douglas fir-larch or Southern pine framing, with 16 gage staples 1-1/2 in. long and 1 in. minimum penetration into the framing, at panel-edge spacings of 6, 4, 3 and 2 in. For Structural I sheathing applied directly to the framing it prints: 3/8 in. panel = 155, 235, 315, 400 plf; 7/16 in. = 170, 260, 345, 440 plf; 15/32 in. = 185, 280, 375, 475 plf. Closer edge spacing means a stronger wall. Note b requires panel edges to be backed with 2-inch nominal or wider framing, and says to space fasteners at most 12 in. on center on intermediate supports (6 in. for 3/8 and 7/16 in. panels on studs 24 in. on center). Note a reduces the values by 0.82 or 0.65 for species other than Douglas fir-larch or Southern pine. The capacity of a wall segment is the plf value times its length in feet.

The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.

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