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P a g e
Table of Contents
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-DH ...................................... 5
IST OF MATERIALS THAT YOU WILL SUPPLY
................................................ 6
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..................................... 10
LOOR ANCHOR BRACKETS INSTALLATION
.................................. 13
UAL HEADER BRACKET INSTALLATION
........................................ 18
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Proper pilot hole diameter and hole depth for various lag screws and wood types
Lag Screw Type
Wood Type
Pilot hole drill diameter and hole depth
¼” X 1-1/4” Lag Screw
McMasterCarr.com SKU 92351A546
Soft Wood
3/32” drill bit diam., 1-1/4” depth
Hard Wood
3/16” drill bit diam., 1-1/4” depth
3/8” X 3” Lag Screw
McMasterCarr.com SKU 92351A636
Soft Wood
11/64” drill bit diam., 3” depth
Hard Wood
¼” drill bit diam., 3” depth
A properly sized pilot hole must be drilled before you attempt to drive lag screws into any pergola lumber member.
See Table, below. Driving lag screws into lumber, without first drilling a pilot hole, can prevent the lag screw from
driving fully into the wood or can lead to crack formation while driving the lag screw in, or later, as the wood dries
naturally. This can result in a weakened pergola structure.