Originally Posted by
Jerome W. Young
Florida house
no drip edge metal; 24 in shake with 10 in. exposure; felt paper layered at each row of shakes; 5/8 plywood decking.
my question is the amount of overhang of the shakes at the rakes and eaves? as far as i know edge metal is not a requirement?
Well for one thing a 10" exposure is wrong. Depending on the grade of shingle and the slope of the roof you should not have more than a 71/2" exposure on a 24" shake.
The main purpose of a metal drip edge is to support the shingles so that the water "drips" off the edge. We have all seen roofs without a metal drip edge and how those composition shingles droop and the water then runs down the fascia, etc. With shake shingles they don't need this type of support, they are not flexible like a composition shingle.
In FL, you might have a requirement for a metal drip edge as this is part of the wind resistance system for the room.