How to Build Interlock Stairs (with Pictures)1. Create your plan or design including the following information: what the steps are going to look like and what materials are going to be used. Mark on the wall where the bottom of your steps will be and excavate (dig out) ten inches below the mark. Line the bottom of the hole. Once you have reached the desired depth (this can be measured by placing the end of a level of the mark, holding it level across the hole and using a measuring tape to measure for the level down to bottom of the hole), line the bottom of your hole with poly or plastic sheeting to prevent the soil from contaminating the GA ( granular aggregate or gravel). Fill the hole with GA four inches deep, then compact it with a vibrating plate (repeat this process until you reach a reach about a half inch below the mark on the wall). Once you have compacted your last lift of GA, check it with a level to make sure you don’t have any high spots and if you do simply scratch out the extra GA with a rake. Using spray paint, mark out the outside of the first step and the base layer for the side wall. Cover the painted line with several shovelfuls of stone dust (finely crushed rock). Smooth out the area where the mark on the wall is located to expose the mark. Stand in the middle, place your level with one end on the front of the mark end the other end parallel with the painted line (leaving your six inches of over base) and pull it towards you, watching the bubbles and keeping it level (make a pad of dust twenty inch’s wide). Repeat this process working off of your last level mark each time until you reach the wall on the other side (pull all extra stone dust to the inside as it will be used for fill). Place the bricks on the ground where you planned for the first step and break the end of the end bricks in the row to give it a natural look. Place the rest of the bricks from the end of the front row in to the wall (make your cut at the wall end). Start on the second layer. Now that you have finished your base course or buried course (it is called this because this brick will be hidden by the other brink to insure stability and to meet building codes for step sizes) put a second layer on the wall (makes sure that you do your best to bridge the joints, interlock your corners, and glue the second layer to your base). Once the glue has set for a least half an hour, fill in the middle with GA using the same four inch lifts that you did earlier. When you are within half and inch of the top, make a twenty pad where the next step will go and use level to make a flat pad by dragging it across the sides. Lay your base coarse directly behind the first step and build up the sides using the same technique as before. Put on your second layer, glue it and repeat these last steps until you reach three and a half inch’s from the top (the height of the cap which is the decorative stone that is placed on top of each step). Cover each step with cap, glue it, allow it to dry for at least twelve hours, and you're finished. The experts at DIYNetwork.com show you how to install brick pavers to provide an attractive durable surface. Means Precast stairs are the fastest and most economical way to add or replace steps for any home. Ideal for both new home construction and older home renovations. Hardboard prefinished panel. 8 ft. x 4 ft. 1/4 in. thick. Red brick pattern. Sold in complete boxes only. ![]()
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