## Table Of Roofing Material Weights

**Note:** The values in the table are for the installed weight of roofing materials. Shingles, tiles, and panels overlap the weights for these materials will be higher per square foot than for the uninstalled weights of the same materials.

Weight of Roofing Materials |
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These are the weights of typical actual products the weights of other actual products of the same type may vary. |

Roofing Material |

## How Many Squares Are In A 1000 Sq Ft

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Conversions Table | |
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10 Square Feet to Roofing Squares = 0.1 | 800 Square Feet to Roofing Squares = 8 |

20 Square Feet to Roofing Squares = 0.2 | 900 Square Feet to Roofing Squares = 9 |

30 Square Feet to Roofing Squares = 0.3 | 1,000 Square Feet to Roofing Squares = 10 |

## How Much Underlayment And Other Materials Will My Roof Need

Roofs not only have shingles, but also felt underneath the shingles and ice and watershield in the valleys. You can get 15 lb felt or 30 lb felt. Both types are generally $20 per roll. 15 lb felt covers 4 squares per roll, and 30 lb felt only covers 2 squares, so youll need double the amount of rolls if you use 30 lb felt.

We have some advice from a professional roofer on selecting the proper underlayment . When it comes to asphalt saturated felt paper, there is only one true 30 lb UL. It is made by Tamko and it is called Tamko Underlayment 30 lb felt. It typically needs to be specially ordered. Regular 30 lb felt is a UL 15 or 16, just as regular 15 lb felt is typically a UL 8. GAF Shingle Mate lays nice and flat and is one more Branded Component needed to meet warranty requirements.

If you have a 30 square roof and go with 15 lb felt, it will cost about $160. If you use 30 lb felt, it will cost approximately $320.

Ice and watershield underlayment is installed in the valleys of a roof for extra protection. An average roof needs about 2 rolls of ice and watershield. Each roll costs about $50, so total cost of ice and watershield is $100.

Most homeowners are having new ridge vent installed on their home now. The average home needs 60 feet of ridge vent. Ridge vent comes in 4 foot sections for $10 per section. After doing the math, ridge vent on a home costs $150.

**Recommended Reading: Overhang Extension **

## How Many Squares Per Roll Of Underlayment

The roll size depends on the type of underlayment product. Synthetic underlayment comes in 10 square rolls, while regular #15 felt comes in 4 square rolls.

So for the 24 square roof example, you would need 2.4 rolls of synthetic underlayment, or 6 rolls of regular #15 felt.

- 24 squares ÷ 10 squares per roll = 2.4 rolls of synthetic underlayment
- 24 squares ÷ 4 squares per roll = 6 rolls of regular #15 felt

**Remember**: Add 10%-15% for the waste factor on underlayment, as well.

Finally, if you have any questions about your estimate, ask a roofing contractor in your area. Most will be happy to give you a free estimate.

## Check With The Roofing Manufacturer

**Manufacturer technical data** **sheets** are almost always made available on the manufacturers website.

For links to a huge selection of roofing manufacturers, organized by roofing material or product type, see Roof Onlines Roofing Manufacturers Directory.

See __roofing materials at the Home Depot__. Both the weight and the square footage are typically given in the product description, which allows you to figure out the weight per square foot of actual roofing products. Home Depot will also deliver to your home, by the way.

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## How To Account For Shingle Wastage

There will always be a certain amount of wastage when constructing a shingle roof, but this can vary hugely depending on the shape of your roof and any extra features it has.

For a complex roof with lots of corners, you can expect to go through more wastage and offcuts of shingles compared with a simple roof. Roofs with dormer windows or skylights will also have more wastage compared with those that dont, as you will need to make more cuts in the shingles, and the leftover portions will be unusable.

For any roofing project, you should buy between 10 and 15 percent more shingles than you have calculated. So for a roof that measures 20 squares, you should buy an additional 2 or 3 squares to account for wastage. This is because 10 percent of 20 is 2, and 15 percent of 20 is 3. If you are ordering your supplies in bundles, then this will mean you will want between 6 and 9 extra bundles, based on the fact that there are 3 bundles in each square.

Although this might seem like needless extra expenditure, you dont want your project to be delayed if you run out of shingles and cannot get hold of more of the same ones immediately. It is always safer to have more shingles than you need as opposed to less.

If you have shingles left over at the end of your project, you should save them for future repairs or replacements on your roof, so you wont have to have mismatching shingles.

## How Many Bundles Of Shingles Do I Need For A 10×12 Shed

To calculate the amount of shingle bundles needed for a 10×12 shed, you first have to calculate the square footage of the roof.

Lets say this shed has a gable roof running parallel to the long end of the shed. The shed also has a roof overhang of 1 all around. Therefore the length of one side of the roof is 14.

The pitch of this roof is 4:12. A rough estimate of the width of one side of the roof is just a bit over 5 say 53, which is 5.25 feet. Add a foot of overhang and you get 6.25. Multiply this by 14

Multiply the two and you get 87.5 square feet. Multiply that number times two and you get 175 square feet your total roof area.

Now you need to find out how many bundles of shingles is required for 175 square feet of roofing. Divide 175 by 100 to find out how many squares of roofing you have. This equals 1.75. We know that each square of roofing requires 3 bundles of shingles, so 3 bundles of shingles times 1.75 roofing squares equals 5.25 bundles of shingles.

You still have .25 of roof leftover. It would be prudent to purchase one extra bundle of shingles to ensure you cover your entire area and to replace any damaged shingles in the future.

Thus, it takes 6 bundles of shingles to properly cover the roof of a 10×12 shed with a gabled roof and a 1 overhang around all sides.

**Recommended Reading: Where Do You Put The Screws On A Metal Roof **

## How Do You Calculate The Weight Of A Bundle

We already know that a bundle of shingles constitutes 1/3 of a roofing square. So, our 800-square foot roof would need 24 bundles of shingles .

If were talking about standard three-tab shingles, which weigh between 60 and 80 pounds per bundle, then we can determine the weight of all of the shingles on the roof. The weight of 24 bundles of 3-tab shingles would be between 1,440 and 1,920 pounds .

That total weight also depends on another factor: layers. Most local building codes allow for two layers of shingles on roofs with a 4/12 pitch or less and up to three layers of shingles or more sharply pitched roofs.

If youre installing a new roof over an old one, multiply the total weight of the shingles for the entire roof by the number of layers.

So, in our example above. An 800-square foot roof with two layers of 3-tab shingles would weigh between 2,400 and 2,880 pounds.

Other factors can also influence weight. Shingles that are more worn out and have lost a significant amount of their grit will weigh less than newer shingles.

## How Do You Calculate How Many Shingles To Buy

Measure the actual surface area of your roof rather than basing your calculations on the homes square footage. Roof pitch and elements such as gables and dormers will affect the amount as well. Use a simple roofing calculator to get a rough idea of square footage. For a more accurate picture, use a roofing calculator that can take all of these peripheral factors into account or consult with a roofing contractor.

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## How Much Roofing Underlayment

Up till now, we were discussing **how to measure roofing shingles** for re-roofing. When talking about a new roof, the same amount of square footage is required for the underlayment.

You will find underlayment in rolls of four squares each. In order to determine how many rolls of underlayment you would need, you need to divide the number of squares for 2 planes by rolls of one square.

**Rolls of underlayment required: 280 sq. ÷ 4 = 70 rolls**

If you are applying the shingles over an asphalt roof, then you dont need underlayment.

Pro Tip: In order to avoid any delays in installment due to shortage of shingles, add 10% to the total material requirement for trim allowance.

## How Much Does It Cost To Tear Off A Roof

The next thing you need to consider when totaling the cost of a roof replacement is the cost of tearing off your original roof. This depends on the company you hire, the size of your roof, and the intensity of the tear off. The price for tearing off the existing material on an average home is $1,000.

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## Cost Of Shingles At Home Depot Vs Roofing Supplier

If you are planning to install the shingles yourself, you may be wondering whether you can save money by buying them at Home Depot rather than a roofing supply store.

**In short: Home Depot roofing shingles will be only slightly cheaper a difference of about 2.5%**

Here is an example of pricing I got from Beacon Sales in West Bridgewater, MA , for CertainTeed Landmark, GAF Timberline and IKO Cambridge laminated shingles.

**This chart compares the cost of asphalt shingles from Beacon vs. Home Depot**

Brand | |
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N/A | $25.00 / bundle or $75 / square |

Note, that prices for 3 tabs are calculated based on a quantity larger than 16 squares. The cost for architectural varieties is calculated based on a quantity larger than 12 squares.

## How Big Is A Square In Roofing

The calculations above will give you the total number of square feet of the roof area.

As you have noticed in the roofing industry however, the surface of the roof is being measured in * squares*. This refers to the roof area that

**measures approximately 100 square feet**.

**Therefore: 1 Square in Roofing = 100 square feet**

Now, in order to determine how many squares are there on the gable roof for example, all you need to do is **divide the total square footage by 100**.

**Total square footage from Example 2 above: 28,000 sq. ft.****Number of squares for 2 planes: 28,000 sq. ft. ÷ 100 = 280 squares**

This means that both planes of the roof will require 280 squares of shingles. A three-tab shingle, which is most commonly used, is packed in 3 bundles per square.

**Also Check: Skylight Metal Roof **

## Builder Mike Guertin Explains 3 Ways To Calculate The Quantity Of Shingles You’ll Need For Your Next Roofing Job

One of the biggest challenges for experienced builder and novices alike is accurately estimating materials for a construction projectespecially for roofs, because they can be **difficult to access** for taking measurements.

But dont fretIn this excerpt from my book **Roofing with Asphalt Shingles**, I describe three reliable methods for determining the area of a roof, plus Ive included tips for estimating the number of extra shingles youll need for waste, overlaps, and starter shingles.

**Note:** be sure to take your time and double-check your numbers when calculating the quantity of shingles, underlayment, flashings, and other materials needed for your**roofing project**. The more accurate your estimates, the less time youll waste waiting for material deliveries during the project.

## What Does 1 Square Of Shingles Cover

To have a modern and up-to-date roof, shingles of different types of materials usually are used. These are at the free choice of the user who wishes to establish the roof. One square of shingles has to cover an area of 100 square feet without overlapping strip. This method will give you more material, depending on the type of structure and Angle of the roof.

For this reason, it is essential to have the correct data established, such as total roof area, roof angles, and type of structures. With this, you will estimate the scope of 1 square of shingles, and you will have how many yards you need. If you have a professional contractor, these calculations are routine and save you a lot of material. Otherwise, you can use the traditional way and reinforce with the roofing square calculator.

**Also Check: Metal Roof Skylight **

## Figure Out Your Homes Footprint

If you use the square footage of your home, youll only get a vague idea of what the square footage of your roof is. **Thats why you have to figure out your homes footprint.**

A person of average height will have a stride somewhere between 2 to 2.5 feet. To figure out your homes footprint, you can step off the dimensions of your roof by counting the steps you take to get the length of your home. You will then step off the width of your home.

After stepping off the length and width of your home, youll multiply the two numbers to get your homes footprint.

**Length x width = your home’s footprint**

Your calculations are going to be off, but measuring this way can give you a basic idea of your homes footprint. Keep in mind, square footage of a house does not equal the square footage of a roof.

## How Long Does A Shingle Roof Last

These roofs may last **20 to 200 years** or more depending on the type of material being used. While you’re talking to the manufacturer, find out how long the warranty will last. Warranties often depend on proper installation and regular maintenance in order to remain in effect.

**Asphalt:**15-30 years**Metal:**50 years or more**Clay:**75 years or longer**Slate:**125-200 years

Not all materials are created equal and their quality can vary. Harsh climates with extreme heat or cold, frequent freeze/thaw cycles or high-wind storms can wear out shingles more quickly. To find out how long your material of choice will last, check with your roofing professional, the manufacturer or read the product warranty.

**Recommended Reading: How Much To Repair A Trailer Roof **

## How Big Is A Square In Roofing Measuring For Shingles

Planning to find out how much a new roof would cost you and you need to measure your roofs area or find out how big is a square of shingles? Well then, you have come to the right place.

Installing a new roof on your own is never a good idea. Yes, replacing a few shingles here and there on your existing roof is quite easy but since this is such a huge investment, it is better to call a professional roofer.

If you are a DIYer though and want to start such a project, then read on as we provide some very useful tips.

In order for your roofing project to be successful, you need to invest in both your money and time. It is completely understandable that you would want to find out how much a roof costs.

We would like to warn you beforehand that roofing estimations can be quite difficult to decipher, which is why we are going to be straightforward.

**how to measure for roofing shingles**

## How To Estimate The Size Of A Roof

If youre replacing a roof, the first consideration needs to be the roofs size so you can accurately estimate project materials.

In the U.S., roofs are measured in square footage, and roofing contractors typically quote projects based on the size of the roof in squares. Consequently, gathering the size of the roof in squares and square footage is the first step.

**Get Free Project Estimates**

Find Qualified Roofing Professionals in Your Area

**Recommended Reading: Cutting Roof Trusses **

## Hold Your Horses Dont Try Replacing Shingles On Your Own

Guys love doing handy work, but there are some projects that you shouldnt take on by yourself. Patching up drywall or installing new railings is a piece of cake, but replacing shingles on your roof or putting new ones can be a tough job.

Its also comparatively more dangerous as theres always the risk of falling off the roof and winning yourself an undesired trip to the hospital.

Professional roofing services, offer something much more valuable than a new or improved roof, they offer peace of mind. While replacing or repairing your roof might sound like a fun project to pass the time, its hard work.

Calculating the exact number of bundles youll need is harder than you might think. Every** roof** is different, features like dormers and gables can make it exceedingly difficult to determine the exact number of square feet.

Its recommended that you consult with a professional roofing company and hand over the reins.

Whether youre making repairs or want a brand new roof, doing it yourself just isnt worth the risk. Roofing companies have the talent, experience, and expertise to get it done without making any mistakes.