Outdoor framing hardware and fasteners
Heavy-duty screws and bolts
To fasten large framing members together, such as railing posts to joists, use lag screws, machine bolts, or carriage bolts. Bolts are stronger and can be tightened in the future if the lumber shrinks. Always use washers under the head of a lag screw or machine bolt and the nut on a carriage or machine bolt so the fastener head does not sink into the wood.
To attach wood to brick, block, or concrete, use lag screws and lag shields (also called masonry anchors). To tack a ledger temporarily, use masonry screws; they're not as strong but are much easier to drive and don't require an anchor.
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