Dave writes from Utica, New York: "how do you install your product rafter-mate? the job entails going from peak to soffit."

Answer: I should refer you to the packaging or the company's website because this answer is going to wear out my furry paws. But I want to be helpful so here we go: INSTALLATION
Raft-R-Mate attic rafter vents are 22 1/2" wide and 48" in length. They fit between 24"-on-center rafters. They are installed by stapling the flanges and center valley (if using 22 1/2"-on-center product) about every 10" to the underside of the roof deck at the soffit area. If the rafters are 16" on center the Raft-R-Mate can be separated in the middle to provide two vents that are about 11-1/4" wide. These should be placed in the middle between the rafters. Staple the flanges as stated above.

When installed properly against the underside of the roof deck between the roof rafters, Raft-R-Mate vents will provide in excess of the 1 inch space required by code. Because of its design, the 22 1/2" wide Raft-R-Mate attic vent will maintain a net free ventilation area of 25.5 square inches per rafter cavity (based on 24" on center rafter spacing). Due to the symmetrical design, the product will provide 12.75 square inches of net free ventilation area when cut in half. APPLICATIONS
Owens Corning recommends using moisture resistant staples (MAX 3/8" STAPLES) to attach product to roof deck. Additional Step for Raft-R-Mate vents with Air Stop: Bend down at the accordion hinge. Fit tightly over the top plate and staple to the top plate. CATHEDRAL CEILINGS
When installing insulation in a cathedral ceiling application, it is recommended to maintain minimum 1" airflow between the deck of the roof and the insulation installed to assure positive airflow. Ventilation is required as part of the shingle warranty to cool the deck of the roof in the summer time and to keep the deck of the roof as cold as the outside air in the winter to help avoid ice damming that could damage the shingles.

Install the Raft-R-Mate vents from soffit to ridge in each cavity. For Raft-R-Mate with Air Stop, bend down and staple the insulation block. There should be a gap of 1-1/2" to 2" between each Raft-R-Mate baffle as you proceed up the slope of the rafter to allow excess moisture to get around the vent and into this air flow. Be sure not to have the insulation batt ends start or stop within that 2" gap so it will not force its way through the gap and reduce or stop the airflow. If unfaced insulation is used, a 4 or 6 mil poly should be installed over the interior side of the rafters after the insulation has been installed to provide a strong vapor retarder prior to attaching the drywall or gypsum board.

Whew!