We have an existing concrete cast porch/landing, (6ft x 4ft)in the front of the house leading to the front door. We would like more seating area and want to extend the landing a few feet on one side. It appears the landing is part of the foundation, because there is no visible seam where the foundation and landing meet. Our idea is to cover the existing slab with wood decking, and to extend this decking out one side by 3 feet. How do we do this? Can we just use concrete pier blocks to rest the extension on? Should the extension be attached to the house or to the landing? Do we have to dig? (we're in a cold climate)
Better check local codes. If you are in a cold climate, you will probably have to dig pier supports down below any frost line. Also be sure to check on allowable wood to be used in direct contact with cement.
This one is easier than you thought. I don't know how far off the ground your deck extension is, but since you said it was a slab, I'm assuming you are at or near ground level. Your best bet is to excavate this area (dig) down to a depth that is about 6" below your existing slab. Then dig 2-3 more holes to set a couple or three of those pre-cast concete deck piers. The piers only need to protrude from the ground by an inch. Now you have something to set a 2X6 on. This 2X6 will be your rim joist, which is what you will nail your floor joists into. Next, rent or find a hammer drill and a 1/4" masonry bit. Buy a box or two of "Red Head" 1/4"" hammer set fasteners. Read the instructions on the box to fasten a 2X6 header onto the side of the slab you are adding on to. Now place 2X6 floor joists between the header and the 2X6 that is resting on your concrete piers ( 16" from center to center of floor joists. If you've set everything at just the right depth, when you slap down a treated 5/4 deck board, it rests on both the existing slab, as well as your wooden "extension". Use the same "red head" fasteners to attach the deck boards directly to your slab, and deck screws to attach to the wooden portion. You are now ready to kick back and drink a Miller. Easy, huh?
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