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.
Do the sides of shingles overlap?
When you reach a peak or hip, shingle all the way up the first side (until the reveal portion of the shingles is within 4 inches of the peak) and cut the 3-tab shingles just below the ridge. Shingle the other side and allow these pieces to overlap the ridge by no more than 4 inches.
Is it OK to roof over existing shingles?
The answer is yes, you can lay new roof shingles over old ones. … You can’t do it with wood or slate, for example, and you should never mix materials, such as laying asphalt shingles over cedar shakes. Also, the old roofing has to be in pretty good condition.
Where do you overlap shingles?
There are two simple rules to follow: Each flashing should overlap the one below by at least 75 mm (3″), but not be visible below the shingle top lap. Imbed each step flashing in a 75 mm (3″) wide application of asphaltic plastic cement, and nail in place.
Are architectural shingles harder to install?
Since an architectural shingle roof is easier to install, is more durable and comes with a better warranty, its lifespan cost is, in many instances, actually less than that of a more basic 3-tab roof.
How hot does it need to be for shingles to seal?
Shingles won’t seal unless they warm to an ambient temperature near 70 degrees. That doesn’t mean it needs to be 70, because solar radiance will heat the shingles even if temperatures are in the 40s. However, springtime can be a challenge due to rainfall.
Is it better to hand nail shingles?
Some roofers believe hand-nailing shingles gives them more control over the process. They can use “feel” to determine if the nail is deep enough and in the right location. Since hand-nailing takes a bit more time, they have the chance to correct any mistakes on the spot. On the other hand, labor costs will be higher.
Do you remove plastic strip on shingles?
Do I Need To Remove That Strip? No. The GAF shingle application instructions for our entire product line specifically state that that film does not need to be removed: NOTE: The film strips on the back of each shingle are to prevent sticking together of the shingles while in the bundle.
Should old shingles be removed?
If any areas of the roof have become severely damaged, it’s usually better to remove the old shingles and start from scratch. … If you’re going to add a roof on top of an old one, it’s a good idea to remove any loose shingles and apply a new layer of 30-pound roofing felt before laying the new shingles.
Should I tear off old shingles?
In most cases, more than two layers of roofing shingles does require a tear-off. Laying new shingles over old shingles is easily prone to leaks and reduces the life of the new shingles. This alone ought to be reason enough to do a tear-off; it’s just a bad value not to.
Can I use 3 tab shingles for starter?
A lot of roofers claim you don’t need to use officially designated starter strip shingles and instead opt for using repurposed 3-tab shingles as the starter strip. … Starter shingles should always overhang the eave and rake edges of the roof by about 1/4″-3/4″ to ensure adequate rain water drainage.
How many nails do you put in a 3 tab shingle?
NAILING: Use galvanized (zinc coated) roofing nails, 11 or 12 gauge, with at least 3/8″ diameter heads, long enough to penetrate through plywood or 3/4″ into boards. Use 4 nails per shingle placed 6-1/8″ above the butt edge, 1″ and 13″ in from each end and 1/2″ above each cutout.