CR-21 Landscapes and Irrigation Exam Questions and Answers| 100% Pass|Complete| Newest 2025!

CR-21 Landscapes and Irrigation Exam Questions and Answers| 100% Pass|Complete| Newest 2025! What thickness in millimeters of pavers is used for residences? A. .6 B. .5 C. .75 D. 63.5 D. 63.5 Brick (paving brick, pavers). Rectangular fired clay brick with typical dimensions of 4 inches x 8 inches x 2.5 inches thick. Available in a range of colors, paving bricks have no mortar holes and an average strength of approximately 5,000 PSI. What is the length of a standard concrete block including the mortar joint? A. 8 inches B. 10 inches C. 12 inches D. 16 inchesD. 16 inches Sizes are usually given in their nominal dimensions.A unit measuring 7 5/8" wide, 7 5/8" high, and 15 5/8"long is known as an 8" x 8" x 16" unit. The mortar jointis intended to be 3/8" to fit the modular design basedon a 4" module. When should you seal the bottom of a piece of wood fencing? A. If water pools under them B. when within 5 feet of a sprinkler head C. If there is less than 2 inches of clearance from the ground. D. If it touches the earth D. If it touches the earth If the boards have to touch the earth, seal the board ends before you install them. How is transplant shock avoided? A. NEED HELP WITH THIS CHOICE B. Anti transpirants C. increase water D. FertilizeB. Anti transpirants Antitranspirants, also called antidesiccants, are chemicals that reduce the amount of water plants lose through transpiration. Antitranspirants are useful because excessive water loss can result in transplant shock. They normally act either to induce closing of the stomata or to cover the stomata with a water-impermeable coating. A trench has been prepared for a gray water irrigation lines, according to the International Residential Code, what shall be the minimum depth of the filter material beneath the perforated line? A. 12 inches B. 3 inches C. 8 inches D. 6 inches D. 6 inches Not less than 6 inches in depth of aggregate, ranging in size from 1/2 to 2-1/2 inches (12.7 mm to 64 mm), shall be laid into the trench below the distribution piping elevation. A CR-21 licensee may install residential misting systems under what PSI?A. 1000 psi B. 120 psi C. 90 psi D. 500 psi A. 1000 psi HARDSCAPING AND IRRIGATION SYSTEMS This classification allows the licensee to install, alter, and repair: Residential outdoor misting systems. Free standing or attached to existing appurtenance, not more than 1000 PSI. Blue Stake uses orange to mark which of the following