This prevents water from entering at the top. If the posts will be higher than the railing (the railings will not be nailed to the tops of the posts), nail a metal or wooden post cap onto the top of the railing.Drill 1⁄ 2 in (1.3 cm) holes through the post and the board behind it. Washers are used only on the ends of the bolts with the nuts. Pool Handrail 40x32 inch 304 Stainless Steel Swimming Pool Stair Rail w/ Quick Mount Base Plate for Deck MountedOD:2' Wall Thickness:0.065' 5.0 out of 5 stars 6 149. If you will use lag bolts, use two 1⁄ 2 in (1.3 cm)-diameter galvanized lag bolts with waters and nuts.Drill 1⁄ 2 in (1.3 cm) holes through the post, followed by 3⁄ 8 in (0.95 cm) pilot holes into the board behind the post." X Research source If you will be using lag screws, Brant advises "using two 1⁄ 2 in (1.3 cm)-diameter galvanized screws with washers, which are rust-proof. Then, drill lag screws or carriage bolts into the pilot holes. Handyman Walter Brant suggests "holding a post in the position where it will be mounted and using a large level to hold it in a vertical position." Next, use a drill to form pilot holes through the overhang of the posts into the deck joists. Many people like to leave about 1.5 inches (3.8 cm) or so between the bottom railing and the deck boards as well, so factor this into the post height as well.For instance, if your deck is made of boards that are 1 inch (2.5 cm) thick and the supports are 6 inches (15 cm) high, then you'll want your posts to be long enough to hang up to 7 inches (18 cm) but at least 4 inches (10 cm) below the railing If rails are not being installed directly into the concrete, anchor sockets are available to accommodate 1.90 and 1.50 rails. You'll need enough length hanging below the surface of the deck to attach the posts securely to the supports.An inch or two higher than the railing will look nice. Treads must be at least 10 inches deep, measuring from front to back. The posts' extra height above the railing is just for looks. The IBC code for structural design has some very specific requirements for deck stairs: Stair rails on decks should be between 34 inches and 38 inches high, measured vertically from the nose of the tread to the top of the rail. Most building codes require deck railings to be between 36 inches (91 cm) and 42 inches (110 cm) high.For instance, if you want a railing that is 36 inches (91 cm) high, cut posts that are perhaps 44 inches (110 cm) high. Cut 4x4s to be at least a little higher than the railing will be, plus extra length to hang below the deck planks.
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