Because asphalt shingles are slottet and have gsaps at their ends. Those openings are covered by the solid top of the (offset) next row down. At the bottom, tho cover those spaces, you need the coverage provided by the next row down.

Do you overlap the first row of shingles?

With the starter shingles laid along the very edge of the roof, run a set of starter shingles along the sides of the roof as well. Make sure that those rows come down and overlap the starter shingles you laid at the bottom. Lay your first row of shingles so it overhangs the drip edge by about one inch.

What is the purpose of a starter row of shingles?

Starter strips are an important and integral part of an asphalt shingle roof system. They aid the roof’s water-shedding function by covering shingle joints (and cutouts in traditional three-tab shingles) at the eaves.

Why do people double shingle a roof?

The two most common reasons why you should add a second layer shingles to your roof is for convenience and affordability. Installing a new roof directly over the old one can save you a lot of time. This can help you to avoid expensive labor and messy tears that can occur from the old shingles.

Why do shingles need to be staggered?

Call it whatever you want, you should be looking at roof shingle stagger. Stagger is important because, if the spacing is less than 4 inches, water can travel from joint to joint under the shingles and create a leak in the roof.

How far do you overhang shingles?

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.

Do you nail shingles on the tar line?

Quote from the video:
Quote from Youtube video: Break put a nail right on the tar line. Okay on the on the next one right here above the little break and on the tar lines okay. And then on each end of the shingle.

What happens if you don’t use starter shingles?

Without this starter course of shingles, your roof will lack the foundation needed to prevent water leaks and uplifts from strong winds. The most vulnerable parts of your roof that lack starter strips would be your eaves and rake edges.

How do you start the first row of shingles?

Quote from the video:
Quote from Youtube video: First thing you're gonna want to do is take a full shingle. And you're gonna go flush. Along the eave starter. And flush along the rake starter.

What happens if you don’t stagger shingles?

If the stagger (offset) is not adequate, rain can move through the edge of the shingle to the edge of the lower shingle, creating a leak.

What’s the proper way to shingle a roof?

Quote from the video:
Quote from Youtube video: Same color as what you're using for your main shingles. Take the shingle normally. This is how it would be on the roof. Turn it half a turn this way use this as your starter strip.

Do architectural shingles need to be staggered?

The trick to laying asphalt shingles is to stagger the seams between courses. Begin shingle application at the lower left rake of roof. Continue the first course across roof with full shingles laid flush with the starter strip and fastened with four nails, placed as specified.

How do you shingle straight?

Quote from the video:
Quote from Youtube video: Line popping a chalk line helps in keeping the shingles aligned both horizontally. And vertically.

Should shingles hang over the drip edge?

Quote from the video:
Quote from Youtube video: So let me show you how that's done so here you can see the drip edge is nice and tight against the fascia metal and if you look upwards you can see my shingles are actually over hanging off of that a

Should my shingles overhang my 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.

What is the plastic strip on the back of shingles?

What Is That Shiny Plastic Film Strip On Shingles? Sealant protection… GAF adds a thin plastic film to keep the sealant from activating while in storage and shipping. This film is protecting the shingles from sealing together while in storage but does not align with the sealant adhesive when the shingles are installed.

How many nails should go into a shingle?

4 nails

In most cases, 4 nails are adequate. Position the nails appropriately according to the shingle installation instructions. Align shingles properly to avoid nail exposure.

Why is nail placement important when shingles are installed?

It ensures that each shingle is held in place with two rows of nails – those nails directly in the shingle as well as the row of nails in the shingle above (which penetrate the upper edge of the shingle when installed correctly; if nails are placed too high, they “miss” the shingle below). 3.

What is a roof beauty strip?

A piece of flashing is placed behind the exterior cladding on the wall and then extended out over the shingles. The flashing can be left exposed, or installers can adhere a “beauty strip” of asphalt-shingle material to the flashing to make it less visible from the ground.

What does stacking the roof mean?

1, Roof stacking is defined as the added structure over the rooftop of an existing building to create one or more stories of living spaces [7] .

What is a horizontal row of shingles called?

Course. Row of shingles that can run horizontally, diagonally or vertically and sometimes termed the run of the shingle.