When laying shingles do you start at the top of the roof or the bottom?
bottom
To lay out the design for the shingles, begin at the bottom of the roof and place a tape measure ½ inch from the edge of the roof to ensure the shingles overhang the drip edge. Mark 12 inches up on the roof for the first course of shingles, then mark every 5 inches all the way up the roof to set your reveal.
How do you lay first layer of shingles?
Lay the first row of shingles directly covering the narrow starter row. Snap a horizontal chalk line over the starting row to use as a guide. Cut six inches off the length of the first starter shingle nailed on, then use the rest of them full size.
Why do you put the first row of shingles upside down?
The sealant on an upside-down three-tab shingle ends up far too high up the roof to effectively seal the first course of the finished shingles. The proper way to adapt three tabs as starters is to trim the tabs off the shingle along a line across the tops of the cutouts.
How far should shingles hang over drip edge?
¼ to ¾-inch
Asphalt shingles should overhang the exterior edge of the drip edge by ¼ to ¾-inch. Check local building code for drip edge requirements prior to the start of your roofing project.
Should shingles overhang drip edge?
The edge of the shingles should hang over a roof between an inch and an inch and a half — or between a half inch and three-quarters of an inch if drip edge flashing is installed. Too much overhang and the shingles could blow off in high winds; too little can allow water to seep into rake or fascia boards.
How far should shingles overhang?
Shingles should not extend more than 3/4” (19 mm) past the drip edge. If shingles overhang the edge of the roof by more than 3/4” (19 mm), then they are not supported and may crack and break off. In addition, the wind resistance at the roof edge may be compromised.