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An installer is using ½ in lag boits to secure roof-monitoring hardware to rafters through...

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An installer is using ½ in lag boits to secure roof-monitoring hardware to rafters through a roof deck. Which of the following should the installer predrill?

A.

A pilot hole one-half the length of the bolt

B.

A pilot hole one-fourth the length of the bolt

C.

A 1/8 in, pilot hole through the roof into the rafter

D.

A 5/16 in pilot hole through the roof into the rafter

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