Concrete contractor Shawn Doyle is on hand to review the techniques used in pouring the concrete floor of the garage. A laser levels is used to ensure an accurate level and several power and hand tools are used to smooth the floor. Lastly, a control joint is installed to allow for expansion and contraction of the floor.

Bob talks with homeowner Howard Brickman about drying out of the new addition. Concrete can pose problems for the wood-floor installation business. Brickman's consulting business created a device that measures the relative humidity of the interior of the concrete and predicts what will happen after the concrete is covered with a floor covering. The whole exterior structure of the addition, except for the roof, is made of concrete. It's critical that the concrete that makes up the floor is dried before the wood floor is installed. This is especially true in Southern climates where there is a high amount of humidity.

Tom Moorad joins Bob to show how his proprietary technique and product for color staining concrete is applied. He explains that the concrete slab should first be etched then treated with a mineral acid -- not muriatic acid, as that is too strong and will degrade the acrylic stain that goes on the surface. This is called "shocking the substrate". Moorad then applies the stain with a hand pump, making drip patterns over a small area and using a squeegee or skimmer to move the material across the surface. The key is to avoid pooling or puddles and to be sure that it sinks into the surface. The stain dries very quickly and will be covered with two other colors to complement the dark metallic look of the Porcelanosa tile inside. Moorad applies a final clear coat sealant once the colors have been set. Homeowners Jim Minardi and Teresa Fogelini tell Bob about the other selections they have made for floors, including a light oyster color for the pool deck, which will reflect light and stay cooler. The bedroom adjacent to the lanai area will have Bellawood hardwood Brazilian walnut.

The PEX tubing is set in the concrete and will circulate hot water used to heat the addition. Jason McKinnon of Viega North America reviews the features of PEX tubing. PEX is electronically cross-linked polyethylene tubing that is made to be stronger and resistant to high temperatures and pressures. The PEX tubing was placed in the concrete slab. The concrete acts a low-temperature radiator for the tubing. High temperature water will be pumped through the coils and heat will dissipate into the slab. A heated slab acts as a radiant heat source for the home. Tim Cutler of TJ's Plumbing & Heating reviews how the tubing was placed within the slab. In a radiant-heat application, the tubing is evenly spread out across the floor. With radiant heat, the air is not heated, only the floor. The heat is modulated according to outside weather conditions so a precise amount of heat is sent through the coils to warm the building's interior to the desired temperature. A heat/loss analysis done on the home indicates that the tubing should have nine-inch spacing for five circuits. During manufacturing, the tubing has 10,000 volts sent through it which cause the molecules to cross-link. This makes the tubing virtually indestructible. An oxygen barrier is sprayed on it to protect the boiler and the heating system from oxygen infiltration, which causes cast iron boilers to deteriorate. A foam stapler pushes plastic clips with prongs into the foam decking to secure the tubing in place.

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…completed. Sheet-metal tracks are screwed into the concrete floor and up into the joists as carriers for new steel studs…
…stairway is strengthened with posts drilled into the concrete and up into the stringer, and stiffened with plywood…

…problems of the home with Bob and then explains how they will reduce moisture on the inside. The crew breaks up the concrete floor to create an interior drainage trench, applies Clean Walls to isolate the stone walls and send moisture runoff to…