The rule of thumb for downspouts: at least one downspout for each 40 feet (12 m) of gutter. For roofs with gutters, make sure that downspouts discharge so water will drain away from the foundation. Downspouts can be checked for size. Seven square inches is generally the minimum except for small roofs or canopies. There should be attachments or straps at the top, at the bottom, and at each intermediate joint. Downspout fasteners can rust, deform, fail or become loose. On buildings with multiple roofs, one roof sometimes drains to another roof. Where that happens, water should not be discharged directly onto roofing material. The best practice is to direct water from higher gutters to discharge into lower gutters through downspout pipes. Wooden gutters are especially susceptible to rot and deterioration and should be monitored. Pitched roofs in older buildings may end at a parapet wall with a built-in gutter integrated with the roof flashing. At this location, drainage is accomplished by a scupper (a metal-lined opening through the parapet wall that discharges into a leader head box that in turn discharges to a downspout). The leader head box should have a strainer. Check the scupper for deterioration and open seams. All metal roof flashings, scuppers, leader head boxes and downspouts should be made of similar metals.

Homeowner maintenance includes cleaning the leaves and debris from the roof’s valleys, gutters and downspouts. Debris in the valleys can cause water to wick under the shingles and cause damage to the interior of the roof. Clogged rain gutters can cause water to flow back under the shingles on the eaves and cause damage, regardless of the roofing material. This condition can occur with composition shingle, wood shake, tile or metal. In the winter if drainage systems are clogged this moisture that has wicked under the roof covering can create a ice dam and cause damage to your roof system.

Inspect the downspouts to make sure they are clean, clogged downspouts will cause the same damage.If downspouts are underground, make sure the area of discharge is cleared of grass  and other plant material.  If the discharge area is blocked water can back up into the downspouts also creating an ice blockage and eventually into the gutters and cause the same ice dam issues as described above.

Ice dams can form on pitched roof overhangs in cold climates subject to prolonged periods of freezing weather, especially those climates with a daily average January temperature of 30º F (-1º C) or colder. Heat loss through the roof and heat from the sun (even in freezing temperatures) can cause snow on a roof to melt. As water runs down the roof onto the overhang, it freezes and forms an ice dam just above the gutter. The ice dam traps water from melting snow and forces it back under the shingles and into the building’s interior.  Watch the edge of the roof overhang for
evidence of ice dams and look at the eaves and soffit for evidence of deterioration and water damage. If the house has an attic, the underside of the roof deck at exterior walls can be checked for signs of water intrusion.

Safety:  Don’t forget about safety when cleaning your gutters.

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How do central air humidifiers work?

Central air humidifiers are integrated into the forced-air heating system so that they humidify air while it is being heated.  The water that is used by the device is pumped automatically into the humidifier from household plumbing, unlike portable humidifiers, which require the user to periodically supply water to the device. Humidifiers are available in various designs, each of which turns liquid water into water vapor, which is then vented into the house at an adjustable rate.

Why humidify air?     

Moist air  seems to soothe irritated, inflamed airways. For someone with a cold and thick nasal secretions, a humidifier can help thin out the secretions and make breathing easier.
Indoor air that is too dry can also cause the following problems:
    •    damage to musical instruments, such as pianos, guitars and violins;
    •    dry skin;
    •    peeling wallpaper;
    •    static electricity, which can damage sensitive electrical equipment, cause hair to stick up, and can be painful or annoying; and
    •    cracks in wood furniture, floors, cabinets and paint.

Central Humidifier Dangers

Humidifiers can cause various diseases. The young, elderly and infirm may be particularly at risk to contamination from airborne pollutants such as bacteria and fungi. These can grow in humidifiers and get into the air by way of the vapor where it can be breathed in. Some of the more common diseases and pathogens transmitted by humidifiers are:
    •    Legionnaires’ Disease. Health problems caused by this disease range from flu-like symptoms to serious infections. This problem is generally more prevalent with portable humidifiers because they draw standing water from a tank in which bacteria and fungi can grow;
    •    thermophilic actinomycetes. These bacteria thrive at temperatures of 113° to 140° F and can cause hypersensitivity pneumonitis, which is an inflammation of the lungs; and
    •    “humidifier fever,” which is a mysterious and short-lived, flu-like illness marked by fever, headache, chills and malaise, but without prominent pulmonary symptoms. It normally subsides within 24 hours without residual effects.
Other problems associated with humidifiers include:
    •    accumulation of white dust from minerals in the water. These minerals may be released in the mist from the humidifier and settle as fine white dust that may be small enough to enter the lungs. The health effects of this dust depend on the types and amounts of dissolved minerals. It is unclear whether these minerals cause any serious health problems;
    •    moisture damage due to condensation. Condensed water from over-humidified air will appear on the interior surfaces of windows and other relatively cool surfaces. Excessive moisture on windows can damage windowpanes and walls, but a more serious issue is caused when moisture collects on the inner surfaces of exterior walls. Moisture there can ruin insulation and rot the wall, and cause peeling, cracking or blistering of the paint; and
    •    accumulation of mold. This organic substance grows readily in moist environments, such as a home moistened by an over-worked humidifier. Mold can be hazardous to people with compromised immune systems.

Designs and Maintenance

drum-type humidifier:  has a rotating spongy surface that absorbs water from a tray. Air from the central heating system blows through the sponge, vaporizing the absorbed water. The drum type requires care and maintenance because mold and impurities can collect in the water tray. According to some manufacturers' instructions, this tray should be rinsed annually, although it usually helps to clean it several times per heating season.
    •    flow-through or “trickle” humidifier:  a higher quality though more expensive unit than the drum-type, which allows fresh water to trickle into an aluminum panel. Air blows through the panel and forces the water to evaporate into the air stream. Excess water exits the panel into a drain tube. This design requires little maintenance because the draining water has a “self-cleaning” effect and, unlike the drum-type humidifier, there is no stagnant water.

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