Roof Ventilation With Insulation

For the same reason insulation shouldn t touch the roof s underside.

Roof ventilation with insulation.

Attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents. Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Baffles are available at home centers. Hot air exhaust vents located at the peak of the roof allow hot air to escape.

The solution is to add baffles which allow air to flow past the insulation photo 9. About attic ventilation natural attic ventilation. These fans may be controlled by a switch or a thermostat which detects heat build up in the attic space and. If the attic is insulated with fiberglass batts just pull back any that are blocking the flow of air.

Covering up the soffit vents with loose fill or batts which can happen if you stuff insulation along the eaves is a huge no no. Sure installing roof vents for older homes can reduce your hot air during the summer but there are probably more low risk cost effective ways to increase your home s energy efficiency. At first it may seem odd to add insulation for warmth and then purposely allow cold air to. That means air can t flow from the soffit vents to the roof vents.

The success of a vented attic or roof deck relies on its airtightness. Baffles placed in this area channel intake air into either the attic space or vent chutes and also prevent insulation from falling into the soffit and blocking airflow. If your attic is well insulated the insulation might be plugging the spaces between rafters just above exterior walls. Whole house fans powered attic fans.

The soffit vents are now installed but you still need to make sure there s no insulation blocking the new vents. Traditionally insulation materials that are placed inside of an attic will require air circulation within the attic space to assist in drying excess moisture in this indoor space. The space above the top plate of exterior walls at the bottom of each rafter bay is especially important. If there s blown in insulation like ours rake back the fluffy stuff with a 3 or 4 ft long 1 x 6 or use a garden rake or hoe.

Insulation is used in an attic for cross ventilation to minimize potential for moisture accumulation and condensation to help energy savings and moisture control. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Good roof ventilation can do this but shingle color sun exposure and insulation are exponentially more important to overall energy efficiency than ventilation.