Relative Humidity Primer #2

How to Correctly Control RH

In our last post we defined what Relative humidity is and described certain relative factors that will help homeowners understand how it can become a real menace to the comfort level of the home, or the friend it can be to your comfort.

This week, in a bit of a checklist approach, we'll list the kinds of symptoms that can be reduced or eliminated when RH Is correctly controlled, followed by a list of the factors that contribute to RH to make them excessive.

What are positive results of correctly controlling RH?

Reduce or eliminate…

· Occurrence of mold & mildew, related toxins & spores in live/work areas

· Ceiling & wall water stains

· Occurrence of failed window sealed units (excessive humidity is primary cause)

· Peeling wallpaper & bubbling paint

· Deterioration & rot in drywall, wood trim, flooring, & wood framing

· Musty smells

· Corrosion in steel wall systems (rusting of steel)

· Condensed or foggy windows

· Carpet wetting and staining under window areas

· Wall cavity damage through excessive dew point water movement

· Water collection & flooding in window drain troughs

· Window & door frame, furniture & hardwood floor swelling or shrinking

· Aggravated allergy or asthma symptoms

· Aggravated eczema, skin, or membrane conditions

· VOC off gassing & related diseases or symptoms

· Static electricity

· Dry eyes

What factors contribute to RH or combine to make them excessive?

· Humans and pets (mammals) excrete significant moisture through normal breathing & perspiration

· Extended showering or bathing

· Hand washing and air-drying laundry (indoor racks or lines)

· Automatic dryers - particularly where filters are not clean, vents are not clear, or fans have insufficient pressure to move hot moist air to the unit exterior

· Steaming, slow cooking or boiling food

· Inadequate heating of the indoor environment will create condensate problems

· Excessive heating can raise RH % to the point where condensation is uncontrollable

· Gas or propane fireplaces with containment doors open

· Gas or propane stoves

· Large pools of free water (aquariums, numerous or large potted or hydronic plants requiring significant water for growth or maintenance)

· Inadequate daily fresh air changes in living or working space

· Roof leaks

· Plumbing or fixture leaks

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