When working over concrete, you will need to cut down the height of the bottom module, if your riser height is less than 4 3/4" high because the module with decking on it has a 4 3/4" riser. Make a shorter module by cutting all module 2x4s to the height needed. Remember to compute the 1 1/4" thickness of the decking. If the module height is reduced, brace the two front bottom 4x4s as shown. You can also use this bracing for guardrail stability, even if the module is not shortened.
| Modify a standard stair module (shown on page 58) using a 63" front end piece instead of a 39". Set module in place and attach 4x4s with 3" screws. |
| Cut a 45 degree angle on one end of a 2x4 and place it on one end of the 63" front end piece. Mark and cut the 2x4 on the inside edge of the 4x4.(also a 45 degree cut) Attach the 2x4 brace with 3" screws as shown. Repeat on other side. |
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You may have to remove dirt to achieve the proper riser heights when not building over a hard surface such as concrete. You may rest the module on 39" long 2x6 boards laid underneath and across each end of the module. Be sure to attach module to those boards by toe-nailing screws through the end pieces into the 2x6. The two front bottom 4x4s can be placed in 24" deep post holes to provide stability for the guardrail.
Boardwalk (shown on page 33b) can be installed if desired. Be sure the riser height is equal for all steps, including the one to the boardwalk.
Placing reflective tape or painting a brightly colored strip on the top and the front of each riser's nose will make it easier for users to see where each riser is, especially in low light conditions. We recommend adding a visual marker to each step to reduce the chances of tripping for everyone using the steps.