Garbage Disposals

by Nick Gromicko, CMI and Kenton Shepard Source: https://www.nachi.org/arc-fault-circuit-interrupters.htm

by Nick Gromicko, CMI Source: https://www.nachi.org/anti-scald-valve.htm Anti-scald valves, also known as tempering valves and mixing valves, mix cold water in with outgoing hot water so that the hot water that leaves a fixture is not hot enough to scald a person.

by Lisa Jones-Stohosky Source: https://jselabs.com/blog/popcorn-ceiling-asbestos/ Asbestos can be a toxic concern in some homes, its worth knowing the risks and what can be done.

by Nick Gromicko and Ethan Ward | Source: http://www.nachi.org/factory-built-fireplaces.htm#ixzz2ln9iM4qJ There’s nothing like coming home and warming up next to a roaring fire during the long, cold months of winter, or even chilly evenings in any season. Long commutes to work in the cold and the increasingly short hours of daylight in the fall and winter are made more bearable by the comfort and familiarity of family gatherings by the fire. It may be for this reason that some type of wood-burning enclosure has remained a staple of many households, even though open fire is no longer a necessity for cooking and heating. With this in mind, let's take a look at one of the more modern options available, the factory-built fireplace. What is a factory-built fireplace and how does it differ from a masonry fireplace?

by Nick Gromicko and Kenton Shepard | Source: http://www.nachi.org/bathroom-ventilation-ducts-fans.htm#ixzz2lnG5Zbo4 Bathroom ventilation systems are designed to exhaust odors and moist air to the home's exterior. Typical systems consist of a ceiling fan unit connected to a duct that terminates at the roof. Fan Function The fan may be controlled in one of several ways: Most are controlled by a conventional wall switch. A timer switch may be mounted on the wall. A wall-mounted humidistat can be pre-set to turn the fan on and off based on different levels of relative humidity. Newer fans may be very quiet but work just fine. Older fans may be very noisy or very quiet. If an older fan is quiet, it may not be working well. Inspectors can test for adequate fan airflow with a chemical smoke pencil or a powder puff bottle, but such tests exceed InterNACHI's Standards of Practice. Bathroom ventilation fans should be inspected for dust buildup that can impede air flow. Particles of moisture-laden animal dander and lint are attracted to the fan because of its static charge. Inspectors should comment on dirty fan covers. Ventilation systems should be installed in all bathrooms. This includes bathrooms with windows, since windows will not be opened during the winter in cold climates. Defects The following conditions indicate insufficient bathroom ventilation: moisture stains on walls or ceilings; corrosion of metal; visible mold on walls or ceilings; peeling paint or wallpaper; frost on windows; and high levels of humidity. The most common defect related to bathroom ventilation systems is improper termination of the duct. Vents must terminate at the home exterior. The most common improper terminations locations are: mid-level in the attic. These are easy to spot; beneath the insulation. You need to remember to look. The duct may terminate beneath the insulation or there may be no duct installed; and under attic vents. The duct must terminate at the home exterior, not just under it. Improperly terminated ventilation systems may appear to work fine from inside the bathroom, so the inspector may have to look in the attic or on the roof. Sometimes, poorly installed ducts will loosen or become disconnected at joints or connections. Ducts that leak or terminate in attics can cause problems from condensation. Warm, moist air will condense on cold attic framing, insulation and other materials. This condition has the potential to cause health and/or decay problems from mold, or damage to building materials, such as drywall. Moisture also reduces the effectiveness of thermal insulation. Mold Perhaps the most serious consequence of an improper ventilation setup is the potential accumulation of mold in attics or crawlspaces. Mold may appear as a fuzzy, thread-like, cobwebby fungus, although it can never be identified with certainty without being lab-tested. Health problems caused by mold are related to high concentrations of spores in indoor air. Spores are like microscopic seeds, released by mold fungi when they reproduce. Every home has mold. Moisture levels of about 20% in materials will cause mold colonies to grow. Inhaling mold spores can cause health problems in those with asthma or allergies, and can cause serious or fatal fungal infections in those with lung disease or compromised immune systems. Mold is impossible to identify visually and must be tested by a lab in order to be confidently labeled. Inspectors should refrain from calling anything “mold” but should refer to anything that appears as mold as a material that “appears to be microbial growth.” Inspectors should include in their report, and in the inspection agreement signed by the client, a disclaimer clearly stating that the General Home Inspection is an inspection for safety and system defects, not a mold inspection. Decay, which is rot, is also caused by fungi. Incipient or early decay cannot be seen. By the time decay becomes visible, affected wood may have lost up to 50% of its strength. In order to grow, mold fungi require the following conditions to be present: oxygen; temperatures between approximately 45° F and 85° F; food. This includes a wider variety of materials found in homes; and moisture. If insufficient levels of any of these requirements exist, all mold growth will stop and fungi will go dormant. Most are difficult to actually kill. Even though mold growth may take place in the attic, mold spores can be sucked into the living areas of a residence by low air pressure. Low air pressure is usually created by the expulsion of household air from exhaust fans in bathrooms, dryers, kitchens and heating equipment.

by Nick Gromicko | Source: http://www.nachi.org/wood-burning-stoves.htm#ixzz2lnALrmPr A wood-burning stove (also known as a wood stove) is a heating appliance made from iron or steel that is capable of burning wood fuel. Unlike standard fireplaces, wood stoves are typically contained entirely within the living space, rather than inset in the wall. Wood stoves come in many different sizes, each suited for a different purpose: Small stoves are suitable in single rooms, seasonal cottages or small, energy efficient homes. These models can also be used for zone heating in large homes where supplemental heating is needed. Medium-size stoves are appropriate for heating small houses or mid-size homes that are intended to be energy-efficient and as inexpensive as possible to maintain. Large stoves are used in larger homes or older homes that leak air and are located in colder climate zones. To ensure safe and efficient use of wood-burning stoves, inspectors can pass along the following tips to their clients: Never: burn coal. Coal burns significantly hotter than wood, posing a fire hazard; burn materials that will emit toxic chemicals, such as wood that has been pressure-treated or painted, colored paper, gift wrap, plastic, plywood, particleboard, or questionable wood from furniture; burn wet wood. Generally speaking, it takes six months for cut, stored wood to dry out and be ready for use in wood-burning stoves; burn combustible liquids, such as kerosene, gasoline, alcohol or lighter fluid; let small children play near a lit wood-burning stove. Unlike standard fireplaces, the sides of which are mostly inaccessible, all sides of wood stoves are exposed and capable of burning flesh or clothing; or let the fire burn while the fire screen or door is open. Always: use a grate to hold the logs so that they remain secured in the stove and the air can circulate adequately to keep the fire burning hot; keep the damper open while the stove is lit; dispose of ashes outdoors in a water-filled, metal container; check smoke alarms to make sure they are working properly; and periodically remove the stovepipe between the stove and the chimney so that it can be inspected for creosote. Homeowners may want to hire a professional to perform this service.  Efficiency and Air Pollutants While federal and state governments crack down on vehicle and industrial emissions, they do relatively little to limit the harmful air pollution emitted from wood stoves. The problem is so bad that, in many areas, such as Chico, Caifornia (pictured at right), the smoke from wood stoves is the largest single contributor to that city's air pollution. Smoke from wood stoves can cause a variety of health ailments, from asthma to cancer. To mitigate these concerns, the EPA sets requirements for wood-stove emissions based on the design of the stove: 4.1 grams of smoke per hour (g/h) for catalytic stoves, and 7.5 g/h for non-catalytic stoves. Some state laws further restrict airborne particulates, and many new models emit as little as 1 g/h. These two approaches -- catalytic and non-catalytic combustion -- are described briefly as follows: In catalytic stoves, the smoky exhaust passes through a coated, ceramic honeycomb that ignites particulates and smoke gasses. Catalysts degrade over time and must eventually be replaced, but they can last up to six seasons if the stove is used properly. Inadequate maintenance and the use of inappropriate fuel result in an early expiration of the catalyst. These stoves are typically more expensive than non-catalytic models, and they require more maintenance, although these challenges pay off through heightened efficiency. Non-catalytic stoves lack a catalyst but have three characteristics that assist complete, clean combustion: pre-heated combustion air introduced from above the fuel; firebox insulation; and a large baffle to create hotter, longer air flow in the firebox. The baffle will eventually need to be replaced as it deteriorates from combustion heat. The following indicators hint that the fire in a wood-burning stove suffers from oxygen deprivation and incomplete combustion, which will increase the emission of particulates into the air: It emits dark, smelly smoke. An efficient stove will produce little smoke. There is a smoky odor in the house. There is soot on the furniture. The stove is burning at less than 300º F. A flue pipe-mounted thermometer should read between 300º F and 400º F. The flames are dull and steady, rather than bright and lively. To ensure efficiency, practice the following techniques: Purchase a wood-burning stove listed by Underwriters Laboratories. Stoves tested by UL and other laboratories burn cleanly and efficiently. Burn only dry wood. Wood that has a moisture content (MC) of less than 20% burns hotter and cleaner than freshly cut wood, which may contain half of its weight in water. Burn hardwoods, such as oak, hickory and ash once the fire has started. Softwoods, such as pine, ignite quicker and are excellent fire starters. Make sure the stove is properly sized for the space. Stoves that are too large for their area burn inefficiently. Burn smaller wood rather than larger pieces. Smaller pieces of wood have a large surface area, which allows them to burn hotter and cleaner. In summary, wood-burning stoves, if properly designed and used appropriately for the space, are efficient, clean ways to heat a home.