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We have to lay 20' x 3' sheets of corrugated metal on top of the porch floor joists before we pour the concrete...so, I saw a race track pretty much immediately...when I'll get around to it...unknown, but it's a definite.
Nothing like 15 lanes of racing action! Gonna be one hell of a finish line, LOL
I'll have it cut for 2 or 3 lanes and then have electronic timed start and finish lines.
I'm sure your on top of it, but be sure to double check before you pour so your not on the bottom of it. Much like what happened here in Cincinnati last week.
I have tons of decking on site, never thought to use it for a track. Great idea!