Question 1

What size screw do I need for deck boards?

Accepted Answer

For 5/4 inch deck boards (1 inch actual thickness) into pressure-treated joists, use #10 x 2-1/2 inch or 3 inch deck screws. For 2x6 deck boards, use #10 x 3 inch screws. Always use stainless steel, hot-dipped galvanized, or coated screws rated for ACQ-treated lumber to prevent corrosion. Our Screw Size Selector recommends exact gauge, length, and pilot hole size for your deck application.

Question 2

What pilot hole size do I need for wood screws?

Accepted Answer

Pilot hole size depends on screw gauge and wood species. For a number 8 screw in hardwood (oak, maple), use a 7/64 inch pilot bit. In softwood (pine, fir), use 5/32 inch. The pilot hole should be slightly smaller than the screw shank to allow thread engagement while preventing splitting. Our Screw Size Selector provides exact pilot hole sizes for all common screw gauges and wood types.

Question 3

What is the difference between structural screws and regular wood screws?

Accepted Answer

Structural screws (like GRK RSS or Simpson SDS) are engineered fasteners rated for structural connections - deck ledgers, joist hangers, post bases, and beam connections. They are stronger, harder, and listed in ICC-ES ESR reports with specific load values. Regular wood screws are for non-structural applications only. Always use structural screws for load-bearing connections.

Question 4

How long should screws be for framing?

Accepted Answer

Screw length for framing should penetrate at least 1 inch into the receiving member. For 2x lumber face-screwing: use 3 inch screws to attach through one piece and into another. For toe-screwing: use 3-1/2 inch screws at 45 degrees. For LVL and engineered lumber, follow manufacturer specifications. Our Screw Size Selector calculates the minimum screw length for your material thickness and application.

Question 5

Do I need different screws for pressure-treated lumber?

Accepted Answer

Yes - pressure-treated lumber (especially ACQ and CA treated) is highly corrosive to standard steel fasteners. Use hot-dipped galvanized (HDG), stainless steel 304 or 316, or coated screws specifically rated for treated lumber. Electroplated zinc screws are not adequate for ground contact or ACQ lumber. Our Screw Size Selector specifies the correct coating for each application.