A Frame Attic Ventilation

This article will help you determine if your attic is properly ventilated and show you.

A frame attic ventilation.

You can also contact your local municipality to check on building code in your area. Jonathan sinclair s home a 225 year old timber frame in new hampshire is getting a facelift. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Here are six of the most common misconceptions about attic ventilation.

Photo courtesy jonathan sinclair. Help protect your roof system from premature deterioration by installing a properly balanced attic ventilation system consisting of cobra exhaust vent at the ridge and adequate intake ventilation at or near the soffit areas of your roof. Roof and attic ventsl protect your house from expensive future repairs. The success of a vented attic or roof deck relies on its airtightness.

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. How would you ventilate an a frame roof with eight inches of attic space filled with insulation after a redeck with composite shingle. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. The space above the top plate of exterior walls at the bottom of each rafter bay is especially important.

The homeowner wonders whether his plans include an adequate amount of ventilation for the attic. Most building codes require a ratio of 1 150 ventilation space to attic floor space. This timber frame home in new hampshire is getting new siding over a vented rainscreen. The molded polystyrene baffles available at home centers and lumberyards for about 1 each form channels that hold insulation at bay and direct incoming air upward.

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. Adequate roof ventilation reduces cooling bills extends shingle life and prevents roof rot and ice dams in winter. That said air resistance and interference such as vent grates reduces the area of true ventilation. Both roof and soffit vents are easy to install in just a few hours.

Finally to ensure that the airway to the vent remains open staple a ventilation baffle to the plywood sheathing in each rafter bay. Can you have too much ventilation in your attic. If only it were that simple. November 19 2014 8 52pm 1.

Read on to find out what you need to know about attics soffit vents passive vs. The soffits are closed but are not insulated. Roof ventilation for a frame. If i have roof vents i have good attic ventilation.