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TIPUse the jackhammer to crack the concrete, not to punch holes. If the chisel bores into the concrete without cracking it, stop and try another spot. Getting a stuck chisel out of solid concrete is a cursing waste of time.Rent the jackhammer''s smaller cousin, a "chipping hammer" ($30 to $40 per day), for lighter tasks: breaking up a few square feet of basement floor for plumbing work or chipping ceramic tile off a concrete floor.Brad nailerCOST: $50 per day with compressorBENEFITS: Better results with less time and effort.

HFH of Metro Denver, for example, paints some homes'' interiors with low-VOC (volatile organic compound) paints. VOCs are solvents in paint that outgas (evaporate) as the paint dries, and can irritate the eyes and cause sore throats and coughing. Some VOCs are carcinogenic.Advanced framing techniques ensure structural support with minimal material use. Finger-jointed studs (made from short pieces of wood) are used to frame interior walls. Floor joists are made from engineered lumber, which requires about half as much wood fiber as solid dimensional lumber, yet provides the same or greater strength. Many homes'' floors are covered with carpet made from recycled plastic soda bottles. Recycled wood and plastic lumber are used to build decks. Low-water vegetation reduces lawn maintenance and water use in an area that suffers from periodic water shortages. Additional water conservation measures include installing low-flow showerheads and faucets. Waste from the building site, including wood and cardboard, is recycled.

Duty-Cycle RatingPower-supply rating depends on the type and thickness of the workpiece and the length of time it takes to deposit the longest weld on the thickest material. Duty cycle is the key factor to consider when selecting a power source. Once the engineer has determined the current and voltage needed to accomplish the weld, he then reviews duty cycle requirements.Duty cycle rating is the percentage of time during a 10-minute period a power supply can operate at rated output amperage without overheating. A 300 A machine at 60-percent-duty cycle can weld for six minutes at 300. A during a 10-minute period. Alter six minutes, the welder must rest the machine for the next four minutes to avoid overheating the unit.