Attic Ventilation Ridge Vents

Warm air that escapes living space also carries moisture that will condense on rafters or roof sheathing.

Attic ventilation ridge vents.

Combination eave and ridge venting isgenerally recognized as a superior venting technique. Static vents often protrude from roofline thanks to. Thick ridges of ice on your eaves in winter are a sign of poor attic ventilation. It is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience.

That said air resistance and interference such as vent grates reduces the area of true ventilation. Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof. Where a properly designed and installed eave and ridge ventilation system is employed a free flow ventilation area equal to at least one square foot per 300sf of attic floor area is often sufficient.

Rafter vents ensure the soffit vents are clear and there is a channel for outside air to move into the attic at the soffits and out through the gable or ridge vent. Roof ridge vents do work well when there are soffit vents or box vents that help to draw air into the attic. To install the rafter vents staple them directly to the roof decking. That means you have a lower risk of mold or mildew development.

The rvk1a steel roof cap kit is an the rvk1a steel roof cap kit is an easy to install vent for ventilation fans bath rec room home gym etc. 27 lineal feet required. This cap features both a back draft damper and bird screen preventing outside air from entering the home and birds and small pests from entering duct work. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier.

In other words the entire vent opening doesn t count as vented space. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. Installation of this type of attic ventilation involves leaving a gap in the sheathing along the ridge and covering it with a perforated vent. Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings.

You will also discover that this product can work by itself to release moisture from the house which is especially useful during the winter months. Roof vent attic fan plastic ridge vents air vent ridge vents gaf venting attic vent plug. Warm air that escapes rooms below gets trapped in the attic. Snow melts and the water refreezes on the cold eaves creating ice dams.