How do I calculate how many shingles I need?

How do I calculate how many shingles I need?

How Many Roofing Shingles Do I Need?

1. Measure the length and width of each plane on the roof (including dormers) then multiply length times width.
2. Add the square footage of each of the planes together.

How many square feet does 3 bundles of shingles cover?

33.3 sq. ft.

How many roof shingles do I need?

There are 3 bundles of asphalt roof shingles per square. Some specialty styles of asphalt shingles that are larger or thicker may require 4 bundles per square, but the overwhelming majority of roof shingles are three bundles to cover 100 square feet of roof.

Can you put 2 layers of shingles on a roof?

As mentioned above, homeowners are legally limited to two layer of roof shingles. Therefore, if you already have two layers, you’ll need a full tear-off. Additionally, if your roof is severely damaged, it likely won’t be able to support the weight of a reroof and will need to be torn off.

Is it OK to reroof over old 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.

Should old shingles be removed?

While a repair job can often be more convenient and somewhat more cost-efficient, placing new shingles over old ones is never a good idea. Whether repairing one section of roof, or a replacing a whole one, it’s always best to pull up the old shingles before putting down the new ones.

Will black shingles make house hotter?

Black and dark-colored roofs. In general, dark-colored roofing materials will absorb the heat and cause your attic and/or the top of your house to be warmer than a lighter colored material.

How often should you replace asphalt shingles?

15-30 years

Can you put plywood over old shingles?

As long as the new plywood itself can span the distance and carry the roof, wind, seismic and snow loads for your region, adding new ply over old is just fine. The new plywood thickness should be at least equal to the exusting plywood thickness.

What is the average price to tear off and replace a roof?

On average, it costs from $1.20-$4 per square foot to tear off and replace a roof with asphalt shingles. For a 1,700-2,100 square foot ranch-style property, that costs about $1,700-$8,400. However, roof replacement costs increase when you use higher-end roofing materials.

Is OSB better than plywood for roofing?

OSB takes longer than plywood to get saturated, but also takes much longer to dry out. When used as roof sheathing, this tendency to hold moisture means it will degrade faster than plywood when exposed to chronic leaks.

Can you put 3 tab shingles over architectural shingles?

In most cases, you can apply a second layer of three-tab shingles over an existing roof that features three-tab shingles without having to tear off the existing roof. However, you cannot apply three-tab shingles over architectural shingles.

What is the price difference between 3 tab shingles and architectural?

When it comes to cost, architectural shingles typically runs $35 to $45 per bundle. Three-tab shingles cost an average of $25 to $30 per bundle. On the surface, the architectural shingles are 40 to 50 percent more expensive.

Is it OK to put metal roofing over shingles?

In almost every case, the answer is yes, you can lay down a new metal roof over an existing shingle roof. This is one of the many reasons metal roofs keep growing in popularity – their installation doesn’t require completely tearing off the existing roof, which is a time-consuming and expensive job.

Are architectural shingles better than 3 tab?

Essentially, architectural shingles are more substantial than 3-tab shingles. In fact, they are about 50 percent heavier than the 3-tab kind. The base mat on an architectural shingle is thicker than that on a 3-tab shingle. This makes the architectural shingle a sturdier roofing material.

Is architectural shingles harder than 3-tab?

3-tab shingles are lower in quality; they will blow off a lot sooner than other economical options, which makes these shingles a more costly maintenance item in the long run. Part of the reason for this is that it is easier to install an architectural shingle properly.

Do people still use 3-tab shingles?

The result, says Joan Crowe, a technical services director for the National Roofing Contractor’s Association (NRCA), is that “each shingle looks like three separate pieces when installed, but it’s only one.” Three-tab shingles have been around a long time and are still the most economical and most popular shingle today …

What are the longest lasting roof shingles?

The NAHB (National Association of Home Builders) rates slate as by far the longest lasting roofing material, with a life expectancy of 150+ years, followed closely by clay and concrete at roughly 100 years.

Are 50-year shingles worth the money?

It’s one of the most common questions people ask when it’s time to replace their roof: Are 50-year shingles worth the money? And like most questions, our answer is simple. In most cases, 50-year shingles won’t improve on resale value of a home over 25- or 30-year shingles.