In general carpentry and light framing, a standard rule of thumb requires a fastener to pe… — Armed Services Vocational Aptitude Battery (ASVAB)

In general carpentry and light framing, a standard rule of thumb requires a fastener to penetrate into the receiving structural member by at least twice the thickness of the board being fastened. If a worker is securing a $0.75\text{-inch}$ -thick wooden board directly to framing lumber, what is the minimum total nail length, in inches, required to satisfy this standard?

Answer: 2.25 inches

Answer

The minimum required nail length is

2.25\text{ inches}

(

2\frac{1}{4}\text{ inches}

, equivalent to a

7\text{d}

nail).

To satisfy the standard carpentry rule of thumb that a nail must penetrate into the supporting timber at least twice the thickness of the piece being fastened, the penetration must be

2 \times 0.75\text{ in.} = 1.50\text{ inches}

. Adding the

0.75\text{-inch}

thickness of the surface board gives a minimum total fastener length of

0.75\text{ in.} + 1.50\text{ in.} = 2.25\text{ inches}

Step-by-Step Solution

Calculate the required penetration depth into the base framing lumber.

Penetration depth =

2 \times 0.75\text{ in.} = 1.50\text{ inches}

Standard carpentry practice dictates that the fastener must embed into the receiving member at least twice the thickness of the fastened material to ensure adequate withdrawal and shear resistance.

Calculate the total minimum nail length by combining the board thickness and the penetration depth.

Total minimum length =

0.75\text{ in.} + 1.50\text{ in.} = 2.25\text{ inches}

The total nail length must pass completely through the attached board before penetrating into the receiving member.

Key Concept

Fastener length determination using the two-thirds total length / two-times thickness penetration rule of thumb in carpentry.

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