How Far Should Metal Roof Hangover Drip Edge

Too little can allow water to seep into rake or fascia boards.

How far should metal roof hangover drip edge. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. In my opinion the felt underlayment should also extend beyond the drip edge by 1 4 to 1 2 inch. Drip edge varies in dimensions but typically the flange that nails to the roof surface is about 2 5 wide and the vertical edge that directs roof runoff down and away is about 1 5 in depth. A typical metal roof overhang may be 2 to 4 inches or even less.

However if they used an l type metal flashing or no flashing at all then the starter course and the shingles must be extended beyond the perimeter eve and rake edges 1 4 to 3 4 inch. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. Too much overhang and the shingles could blow off in high winds. The length of the overhang itself commonly ranges from 2 to 5 inches.

A drip edge has to be resistant to possible corrosion and should be 36 gauge or larger. Roof drip edges are generally sold in 10 5 foot lengths but they are occasionally sold in 8 foot lengths or smaller. Lengths of drip vary but typically it s sold in ten foot lengths 120. Don t overdo the overhang shingles that extend more than 3 4 inch can eventually bend and fracture leaving the roof sheathing and fascia vulnerable to water damage.

If you are not using drip edge make the over hang 3 4 then also on page 2 1st course paragraph reads make tabs lie flush with the edges of the starter course i find that by installing 1 instead of 3 4 it compensates for wavy fascia as you said but also if the roofers make a 1 4 mistake it s better to be a wee bit too much than a wee bit too little.