Posted on Fri, May. 02, 2008

-- For many of us, the attic in our homes is a rarely visited storage area for old or seasonal clothing, old photos, books and a whole list of miscellaneous items, but it may also be much more.

An attic may be a trap for moisture and hot, stale air, providing an incubator for mold. At the very least, overheated or moist attics provide an environment likely to damage whatever is stored there.

Most contractors agree that good ventilation in the attic will prevent moisture that may damage your roof system.

Most newer homes are built with adequate ventilation, including vents in the soffits.

One way you can improve the airflow through your attic is by installing soffit vents. Installing these vents is an easy project that can save you thousands of dollars.

Do not be concerned that attic ventilation will increase winter heating costs. The living space in your home is sealed and with adequate insulation in the attic, cool temperatures in the attic will not raise winter heating bills.

A point to keep in mind is that the amount of air inflow through the soffit vents should equal or exceed the outflow through ridge vents and gable vents.

There are three basic types of soffit vents. The first is a perforated vinyl material that covers the entire surface area.

The second is a narrow vent that runs the entire length of the soffit, used when the soffit is less than 16 inches wide. The third are wider, shorter vents used when the soffit is 16 inches or wider.

Tools, materials needed

1. Tape measure

2. Chalk line

3. Carpenter's square

4. Circular saw

5. Drill with 3/4-inch spade bit

6. Jig saw

7. Screwdriver

8. Stepladder

Instructions

1. Mark where the vents will go with the tape measure and chalk line.

2. Using the circular saw, cut along the chalk line the length of the vent openings.

3. With the drill and spade bit, drill a hole in the corner of the vent opening that is being made.

4. Make the end cuts with the jig saw, starting in the drilled holes.

5. Fit the vent into the opening and fasten in place with the screws provided.

Most of us have insulation on the attic floor that will likely be blocking the flow of air through the soffit vent.

One solution is to pull the insulation back from where the roof rests on the outside wall of the house, creating an air space.

Another solution is to install baffles to keep the insulation from blocking the air flow.