The error: Often, the bottom step on a set of deck stairs is roughly 1 in. taller than the rest. Code allows a maximum variation of only 3⁄8 in. between riser heights. Code allows a maximum variation of only 3⁄8 in. between riser heights.
Stair treads are the horizontal boards that you step on. Stair treads may be made of a single 2x12, but are often made of two decking boards or 2x6s. A stringer is a wide board, usually a 2x12, that runs at an angle from the landing pad to the deck framing and supports the treads.
Draw a triangle of 7 1/2" on one side, 11" on the second side, and the 3rd side is the edge of the wood. Now you have a triangle drawn into the wood face. Now draw a straight line 8" back of the edge which is the front face of the wood.
Decking, Railings and Stairs Most decking screws are 8-gauge and, while 2 1/2 inches is the minimum length needed to hold decking boards to the joists, 3-inch screws are commonly used to provide extra holding power against the upward pressure of shrinking or warping boards.
This deck already has wood decking and deck railings installed. Learn the details in How to Build a Deck: Wood Decking and Railings. Deck stairs are typically made from 2 x 12 stringers spaced about 12 to 16 inches apart.
Building and Installing Deck Stairs | Professional Deck (Stairs with open risers are exempt from the overhang requirement.) This conveniently works out when the tread cut is the code-minimum 10 inches, and the tread is a dry 2x12 or a pair of 5 1/2-inch decking boards. Using either material results in an overhang of 1 1/4 inches.
I need to replace the stair treads and landings on two sets of porch steps outside my house. The originals are about 25yrs old and rotten. They appear to have used the same type of stair tread that you'd use for indoor stairs. Each tread is 1 board and the landings are multiples of the same material with no gaps in between each board.
Wood Riser Stairs. Calculating Stair Rise. Use a string and string level to determine the height of the stairs. Mark the end of our stairs with a stake driven in at the point where the bottom riser will sit. The distance should be evenly divisible by twice the width of your decking boards. If not, adjust the position of the stake.
2x10, which gives a tread width of about 9¼ inches. This certainly works for indoor treads but may not be acceptable for deck stairs. In this example we'll use a pair of 5/4 x 6 deck boards, which creates treads one inch thick and 11 inches wide.
Attach the stringers to the deck using angle brackets and 3” galvanized deck screws. Cut a 2x6 board to fit snugly between the two stringers at their base. This will be used to fasten the stairs to the concrete pad. Place the board between the stringers and attach to stringers with 3” galvanized deck screws.