Calculate the your roof's size and estimate how many bundles of asphalt shingles, rolls of felt, and squares of roofing material are needed for a new roof. Add the price per square of materials to get an estimated material cost. Roofing Material Estimate: bundles of 3-tab shingles How to Estimate the Size of a Roof If you're replacing a roof, the first consideration needs to be the roof's size so accurate material estimates can be made. 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. Find Qualified Roofing Professionals in Your Area Find the Area of the Footprint of the Roof To calculate a roof's dimensions, you need to measure the roof as if it were flat, then account for roof pitch, calculate square footage, and finally determine how many squares of material are required for the roof. The calculator above can handle all of this, simply enter the length, width, and pitch, and it will determine the size of the roof in squares.
How to figure metal roofing To use this panel length calculator enter whole numbers and decimals only. We plan to enable the use of fractions at a later time. Enter the diameter of the roof ridge vent gap (1"-3") Finally, enter the coverage area (width) of the panels you plan to buy. For instance a 38" panel will have an effective coverage width of 36". The metal roof length calculator calculates the distance from peak to trim so add the length you want the roof metal to extend beyond the eave trim. We recommend about 2". How To Cut Metal Roofing Never use a circular saw or other device that will fling hot metal chips all around the area you cut. This will void your paint system warranty as no paint system is designed to withstand the heat produced. You will end up with rust pits down the road using tools like this. Use an powered nibbler (air or electric) (or tin snips if you have to). A nibbler will do a precise job and will not produce hot metal chips all around the cut area. To identify the trims required for metal roofing our metal trim details page will show siding and roofing trims by location.
This will give the width dimension to use in figuring your area. This should be done on each roof section containing a horizontal ridge. You will also need to determine the amount of nails you'll need. Generally, you should use four nails per shingle. For regular three-tab shingles, this would require 320 nails per square. For high wind areas or when shingles are being applied to a mansard, six nails per shingle are required (480 nails per square). This is based on 80 shingles per square. Other styles of shingles may require more or fewer nails per shingle and may have more or less than 80 shingles per square. Refer to the application instructions on your shingle wrappers for the correct nailing pattern. Nails are purchased by the pound, so ask your dealer for the correct amount of nails for your size roof, in the length you specify. Measure the lengths of your rakes and eaves to determine the amount of drip edge needed.
667 18:12 56 1. 803 24:12 63 2. 236 Roofing Nails Generally, you should use four nails per shingle in the field of the roof, and 5 nails per starter shingle. For regular three-tab shingles, this would require 320 nails per square for field shingles. Multiply the number of starter shingles required by 5 to determine the number of nails required to fasten starter course. For high wind areas or when shingles are being applied to a mansard, six nails per shingle are required, or 480 nails per square. This is based on 80 shingles per square. Other styles of shingles may require more or fewer nails per shingle and may have more or less than 80 shingles per square. Refer to the application instructions on your shingle wrappers for the correct nailing pattern. Always check what local building code dictates for fasteners. Ask your dealer for the correct amount of nails for your size roof, in the length you specify.
Panels are often measured in inches, use our inches to feet conversion calculator to convert to feet. Finally, divide the square footage of the roof by the square footage of the metal roofing panel to find the number of panels needed for your roof. It's a good idea to order an extra 10% to account for cutoffs and waste material. For more complex roofs with many peaks and sections, find he square footage of each roof section and add them all together to find the total square footage. Consider ordering a few extra panels to account for more cuts and waste. Roofing panels come in many styles and dimensions with different overlap dimensions. The most common lengths are 8', 10', 12', and 16', however many distributors will cut to length. The most common widths are 24" and 36" exposed, but the actual width of the panel will be larger to accommodate an overlap. Each style of panel is unique and may have a different actual width and exposed width. Metal roofs are beautiful and very durable. When installed correctly they can last a very long time with little maintenance.
ft. for the total square footage of the roof. This gable roof has two planes. So, multiply length (A) x width (B) to get the square footage for each plane. Then, add the two planes together to derive the total square footage of the roof: Plane 1: 120' x 100' = 12, 000 sq. ft. Plane 2: 120' x 100' = 12, 000 sq. ft. Plane 1 + Plane 2 = 24, 000 sq. for the total square footage of the roof. Roof surfaces are measured in "squares. " A square is an area of roof which measures 100 square feet. To determine the number of squares on the gable roof above, simply divide its total of 24, 000 square feet by 100. The result is 240, and this means you would need 240 squares of shingles to cover that roof. The most common type of shingle, called a three-tab or strip shingle, is generally packaged three bundles per square. For a new roof, you will also need the same amount of underlayment. So, in the gable roof example above, you would need 240 squares of underlayment. Underlayment usually comes in rolls of 4 squares each.
If you're building a new roof or replacing an old roof system, you'll need to know how much material you'll need to cover the roof. For most roofing projects this includes calculating how much plywood you'll need. We'll outline the formula for determining the right amount of plywood to use for a new roof. A brief overview of plywood Plywood used for roof decking is made of three or more layers of thin wood glued together with alternating grains. The layers are known as veneers. The bottom layer has the grain running vertically through the panel, and each even-numbered layer runs horizontally. When manufactured for roof decking, the plywood is cut into 4-foot by 8-foot sheets. It's a popular material for roof decking as it is a durable, flexible, and affordable option that will cover about 32 square feet. Plywood comes in different thicknesses from ΒΌ-inch to 1-inch, but 5/8 inches is the most popular thickness. 5/8-inch plywood is the standard for most roof applications and supports most roof load situations.
The type of waterproofing material used β There are different types of waterproofing materials used in flat roofs. Since they vary in quality as well as method of installation, the choice preferred for a flat roof will ultimately have an effect on the final slope of the flat roof. In general, the minimum slope for a flat roof is 1 0 but as stated earlier, this is only possible in theory. It takes the manufacturer's recommendations, the unique conditions of the roof as well as the skills and the expertise of the installer to arrive at the right slope. SLATE ROOFS Slate roofs are very attractive when completed, but the process of installing the slates is never an easy one. It is one of the most complex roof types to install in the industry. Many people think that due to the simplicity of the slates, the installation process is also simple. However, there are a number of factors that must be considered to ensure a successful installation. These factors include the pitch of the roof, the type of slate being used, the size of the lap, the size of the slate as well as the site's exposure rating.
A "12 in 12" pitch is a steep, 45-degree angle roof. See the image below for more explanation on rise, run and pitch. Roof Pitch Is Measured By Rise & Run Rise: the distance from the top of a stud wall to the peak of the roof. Run: the distance from the outside edge of a perimeter stud wall to the center of the house; the run always remains constant at 12 inches. Three Easy Ways To Measure Your Roof's Pitch Use one of these three methods below to calculate your roof's pitch. You'll need a level and a tape measure or ruler. Mark a spot on the level, 12 inches from one end. Pitch Measurement Method 1 1. On a ladder beside the roof, place the level a foot or so up the roof, hold it level, and measure from the 12-inch mark on the level's bottom, straight down to the roof. If this distance measures 4 inches, you have a 4 in 12 pitch; 8 inches and you have an 8 in 12 pitch. Pitch Measurement Method 2 2. On a ladder at the gable end of your house, place the level against the gable trim, flat against the side of the house.
Furthermore, how long should Eaves be? Aim for consistent sill heights where possible and consider extending the eaves overhang over full height doors or windows. This allows the 45% rule to be simply met with the following standard eaves overhangs: 450mm where height is 900β1200mm. 600mm for a height of 1200β1350mm. Can you add an overhang to an existing roof? A roof overhang protects the building under it from rain and weather, and if your house doesn't have one, adding an overhang is not an especially difficult construction job. Framing a new overhang is straightforward, but blending the new overhang seamlessly into the existing roof requires some effort and expense.