When temperatures are high during the summer, hot air accumulates in the attic. Something else that works its way up there is moisture generated by the home. When such moisture condenses, it has a damaging effect on the construction material.
Attic ventilation serves two purposes: temperature control and moisture control. To achieve this, both intake and exhaust vents are necessary. The outlets are usually located near the ridge of the roof, while the inlets are usually located along the eaves. This article illustrates how to install the former.
Step 1 - Take Precautions
Before you start the work of installing your vents, take time to ensure your safety while on the roof. Wait till the weather is calm and dry to start this job. Wear rubber-soled shoes and look out for slippery shingles or rotten decking. Always be aware of power lines and television antennas so you can avoid them.
Step 2 -Install the Ridge Vent
Use a utility knife to remove the felt paper and then pull out the staples and roofing nails. Put down a chalk line in a 6 inch perimeter around the ridge and use this as a guide for your circular saw as you cut a channel out of the roof sheathing. Leave the joists alone.
Step 3 - Finish the Job
Now, using staples or roofing nails, fix whatever permeable material you are using as your ridge vent over this channel. After that, cover the vent with a cap. This could be either a metal piece or special shingles designed to leave the airflow from the vent unobstructed.