The overhang is multiple meaning that the sheeting you would overhang some 3/4-1" followed by a drip edge then if using shingles another 1". If using metal w/o drip another 3/4-1" past the wood sheeting.
The roof overhang will be 36 inches at the eaves measured horizontally, and 36 inches at the gable ends. There is a certain logic in extending the gable overhang further the higher you get, as you mention, but that complicates the roof, and I don't like the look of it.
A typical metal roof overhang may be 2 to 4 inches, or even less. Some slight overhang is recommended, in conjunction with a drip edge flashing, to prevent water from getting under the roofing and onto underlying wood.
The peak of the roof is a long way from the base of the wall, so these overhangs are less effective, in general, than traditional eave overhangs in protecting the home. They extend too far. You can think of this logically there is simply much more potential for rain splashback, especially in very windy conditions.
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Deck Building project - Installing decking boards - Step by step ... When installing decking boards, be sure to allow for enough overhang to cover the fascia board and whatever additional amount you prefer. A one to two inch..... [ Contact US] Installation Guide - ChoiceDek. Maximum gap between bottom rail and deck surface is generally. 4-inches.** Some codes ... A. Allow ¼-inch side-to-side spacing between deck boards.
It’s also possible (although much rarer) for roof overhangs to be too wide. A typical gable roof has two kinds of roof overhangs: eave overhangs and rake overhangs. Because it’s easier to frame a wide eave overhang than a wide rake overhang, problems from stingy overhangs are more common at rakes than eaves.
Deck Building project , Installing decking boards , Step by step ,,To get the best finished look start installing decking boards or composite material from the , This way you can account for the ¾” fascia board and a 1” overhang as well as the , This translates to as much as 1/8” on either side of the board.
Composite decking does seem prevalent in our area. We are relatively dry in Colorado bu the Sun takes a toll on exterior woodwork. It is painful to see a great wood deck that was installed 15 years ago showing its age. I hope the composites hold up. There are so many fastener systems to sort through now.
If you are putting a good slope on the roof to shed snow, then he may be right about the amount of overhang you would need. If the roof is almost flat, it may work OK. I believe that a 5:12 slope (5" up for each 12" over) on the roof is the least you would want for any snow.