It's a six-hour challenge to build the coolest multi-level deck in record time. According to the rules, the deck must have built-in planters, seating, a shaded area and cover at least 220 square feet. Extra points after that come from incredible detail. The three contestants have vast experience in their field, but even for them it's an extreme challenge taking what would normally be a week-long project and racing to complete it in a single day. In this episode, competitors are Greg Ethenoz, 29, Thousand Oaks, Calif., Greg DiBernardo, 36, Waldwick, N.J., and Mark Denhartigh, 35, Grandville, Mich. Trouble brews right away as one contestant has to dig a trench to make up for poor level calculations. Also, all three contestants struggle with the tough element of building stairs. They also realize finishing all they planned might be impossible for the time limit given. One of them sacrifices other details in his quest of impressing judges with a cool deck swing, while the another's strategy of playing it safe is questioned by judges. Host Chris Grundy throws in a twist once they finish, imitating Mother Nature by dropping a massive tree branch on each deck to see how they hold up. The design, the build and the test all go into deciding which deck builder will become the next DIY Dominator. Guest judges for the competition are Ari Larraz, general contractor with Larraz Building Excellence, Eric Mcneal, architect and owner of S7g Architecture, and Shawn Miller, custom patio/deck builder and owner of Classic Designs Inc.