

You want it to sit in the middle of the width of the slab to increase the slab’s strength. You can ensure the base is level several ways, but I just used a long carpenters’ level in several spots.Īdd wire mesh designed for concrete slabs into the frame. Pour a 1” thick layer of crushed stone across the base and tamp it down rigorously with a handheld tamper. Continue tapping it here and there with the hammer until it is perfectly level on all sides. As it gets deeper, use a long carpenter’s level on several spots along the tops of the 2x4s to ensure the whole frame is level. Nail the frame into the ground by hammering the tops of the stakes. Nail the stakes into the outside of the frame, along every few inches of the 2x4s leaving 2 or 3 inches of the pointed end of the stake sticking out below the 2x4 and the flat end of the stakes sticking out above it. How many you need depends on the size of your slab. Make or buy stakes that are about 2” x 2” x 1’ and pointed on one end. The length of each line of the X should be the same. Place the frame in the hole and square it by measuring the distance between the corners in an X pattern. Cut the 2 x 4s and then nail (don’t screw) them together. The interior of the frame will be the size of your slab. You need to go about 4 inches deep and then level out the dirt with the backside of a hard rake and a tamp.īuild a frame using 2 x 4 s.

My grill is 3’3” x 7’3” and the slab is 3’9” by 7’6.”ĭig out the area of your slab.

Mark off an area a few inches larger than you expect your grill to be on all sides with a string. You should watch YouTube videos on this, but I’ll give the basic instructions here.
