Exterior inspection in VS .NET

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Exterior inspection
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Vent stack As you walk around the house looking at the roof, look for a plumbing vent stack. If you do not see one, it indicates either that the plumbing system is not properly vented or that the vent stack terminates in the attic. Both possibilities are violations of the plumbing code. If the construction of the roof is such that there are sections that are not visible from the ground, a vent stack should be looked for during the attic inspection. If there is a vent stack, you will see a pipe coming up from the floor and going out through the roof. Exterior inspection 165
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Sometimes it is difficult to check for the vent stack in the attic because of the restricted space and the lack of adequate lighting. The vent stack should terminate above the roof. If you see one that terminates near a window or one that runs up along the side of the building (in the northern portion of the country), it is in violation of the National Plumbing Code (as explained in chapter 3). Fresh-air vent When there is a fresh-air vent for the house trap, if the outer end terminates on the outside of the foundation wall, the opening should be covered with a screen or perforated metal plate. The covering is needed to prevent children from stuffing toys, balls, or other objects into the opening and blocking air movement. Technically, an unprotected fresh-air vent opening is also a violation of the plumbing code. If you do not see a cover over the freshair inlet vent, record the fact on your worksheet as a reminder for later installation. You should also use your flashlight to determine if there is any blockage. Lawn sprinkler systems Does the house have an underground lawn sprinkler system If it does, look specifically for a vacuum breaker (antisiphon device) on the water-supply line for each zone. When the piping arrangement is such that the water is supplied to each zone through a manifold, the vacuum breaker should be on the pipe supplying water to the manifold. A vacuum breaker is recommended to prevent dirty water or foreign matter that normally accumulates around pop-up spray heads from flowing back into the potable water supply as a result of a negative pressure in the line. It is a relatively simple device and is usually no larger than a few inches in diameter and a few inches high. (See FIG. 13-5.) The 166 Plumbing Fig. 13-5. Typical atmospheric vacuum breaker used in lawn irrigation systems. Rain Bird Sprinkle Mfg. Corp. vacuum breaker has an atmospheric vent that is sealed when water is flowing to the spray heads. When the water pressure drops to below atmospheric pressure (vacuum) because of a problem in the supply line, a mechanical float drops, opening the atmospheric vent. This allows air to enter the piping system upstream of the spray heads and thereby prevents dirty water at the spray head from being siphoned back into the supply piping. Vacuum breakers must be located at least 6 inches above the level of the highest sprinkler head. Look for them near the foundation wall. Sometimes the piping is located in a well adjacent to the foundation, similar to a basement window well. Usually, the vacuum breakers and the electric solenoid valves that control the water flow to the various zones are in the same general area. Septic system If the house has a septic system, find out the location of the tank and the leaching area. As you walk around the house performing the general exterior inspection, look specifically for puddles over the leaching area and septic tank. If the puddles have a film on top and there is a foul odor in the area, you can be sure that there is a septic problem. If the puddle is a clear liquid and there is no odor, there might
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still be a septic problem. The best way to find out whether the liquid is septic effluent or surface water as a result of rain is to collect a sample and have it analyzed. If no puddles are noted during your initial exterior inspection, reinspect the area after pushing the septic system as described above.
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filled, do you still hear water running If you do, minor maintenance is needed. Water pressure, flow After inspecting the fixtures, faucets, and associated valves, pay particular attention to the water flow and drainage. When there is a considerable flow of water from a faucet, most people say the pressure is good, and when the flow is merely a trickle, they say the pressure is bad. This is a popular misuse of the word pressure. It is true that if the pressure is low, the water flow will be low. However, a low-flow condition is not usually caused by low pressure. It is caused by a constriction in the inside of the supply pipes. Depending on the quality of the water, mineral or corrosion deposits can form along the inside of a pipe, reducing the effective pipe opening to that of a straw. In this case, even when the source pressure is good, the flow will be less than minimal. Check the cold- and the hot-water flow separately by opening two faucets and flushing the bowl at the same time. If the flow appears to be less than adequate, record the fact on your worksheet as a reminder to check further. The low flow might be caused by a kink in the supply pipe, small-diameter distribution piping, or low water pressure at the service entry. However, the probability is greatest that the low flow is caused by a decrease in the inside diameter of one or more sections of pipe supplying the fixtures. Old galvanized iron piping is particularly bad for water flow. In addition to mineral deposits, there is often a buildup of rust that further constricts the flow. If you find low water flow, especially in an older house, look for galvanized piping. You might find that the house has been partially repiped. Some iron sections might have been replaced with copper or brass. Mixing iron in a copper plumbing system is not desirable, for two reasons. Interior inspection 167
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