the maximum 18-inch spacing presumes treads of 5/4-inch wood decking or 2-by stock. when using synthetic decking for treads, consult the decking manufacturer's instructions - many require stringers be spaced no farther apart than 12 inches or 10 inches, and some even require spacing as close as 8 inches.
how to do deck treads measure the span between the outside edges of the stair stringers using a tape measure. lay the 1-by-6-by-96-inch boards, one at a time, flat on the table of a miter saw. cut the boards to length using the miter saw. mark any cutouts that you require with a pencil for
the key thing to look for when building stairs is stringer spacing that maintains the 12-inch centerline separation for installation on stairs. specialized tread boards that are at least 12 inches deep and at least an inch in thickness so that only one board can be used for each tread, creating a clean look and easier installation. keep in mind that boards that are wider than 12 inches but are less than an inch in thickness are actually fascia boards, and cant be used as treads because
common deck stair tread configurations include 2 pieces of 5/4 x 6 or 2 x 6 lumber, 3 pieces of 5/4 x 4 or 2 x 4 lumber, or a single piece of 2 x 12 lumber. pick whichever configuration you wish, but for 5/4 treads, stringers need to be spaced no more than 12 inches apart, and for 2x treads, stringers are spaced no more than 16 inches apart.
closed stair risers. low voltage lights can be installed into the riser boards in order to meet the irc code for stair illumination. most deck stairs use a nosed tread that extends beyond the riser board which looks attractive and protects it from being kicked loose from above.
if you use the deck itself as the top riser as with this deck, subtract one step. the stair treads will be made of composite decking planks two for each step making the run for each step the distance front-to-back about 11 inches. there are risers or toe kicks on the back, made of pressure-treated wood and composite boards without grooves.
shop deck stair treads in the deck stairs section of seven trusts.com. find quality deck stair treads online or in store. skip to main content skip to main navigation welcome to seven trust's find a store