RYOBI 18 Volt Cordless Drill RYOBI 18 Volt Circular Saw RYOBI 10" Sliding Compound Miter Saw with Laser L-Brackets I used L-brackets to join the panels at the corners. FOR THE FORMWORK: 2x4s + 2圆s I used 2x4s and 2圆s held together with 2.5" deck screws to make the panels for the formwork. The lava rock is heat-resistant and won't crack or shatter. Lava Rock I used two 5 gallon buckets full of lava rock that I purchased from the masonry supply yard. Quikrete 3/4" Gravel I used about 7 bags of Quikrete 3/4" gravel for the foundation layer. This rebar frame will keep the different layers of concrete securely bonded to each other. Wire the horizontal pieces to the vertical pieces so that the horizontal pieces will be embedded in each layer of concrete. Make sure you drive the vertical pieces through the gravel and into the ground so that the ends are at least 3.5" below the top of the wood forms. Use 18" long pieces for the verticals and 36" long pieces for the horizontal pieces. I recommend using a combination of pre-cut 3/8" diameter rebar. I should've purchased 18" long sections for the verticals. Rebar I bought pre-cut rebar in 12" and 36" sections. I followed the directions that came on the mortar clay bag. Mortars I mixed my own mortar from a combination of Portland cement, mortar clay and sand. Fire bricks are heat-resistant and will protect the concrete from cracking. ![]() They aren't the prettiest looking, but after a few fires they will turn black from the soot. Fire Bricks I used fire bricks from a local masonry supply yard. It’s great for making tables, pavers, stools, and lamps and is typically found in 80-pound bags at Home Depot, but 60-pound bags are also available. This is the recommended concrete mix to use because of the high early strength and low price. Quikrete 5000 (20-25 Bags) QUIKRETE® 5000 Concrete Mix is a commercial-grade blend of stone or gravel, sand, and cement and is specially designed for higher early strength.
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