# how to calculate roof area on plan pdf

Once the “footprint” including overhang areas have been determined for each area, find the appropriate slope or pitch factor in the chart below. Once you have figured out your roof area, you will need to also calculate how much room you need to allow for waste. A Note about complex roofs: Complex roofs need more accessories and trims than“easy” roofs – resulting in a slightly higher total cost/square foot. Goderich Important Note: Most metal roofing products are packaged and sold by the square (100 square feet) so for our example roof the number of squares or boxes to purchase is 29. Then, take the product of these two dimensions and multiply it by your pitch multiplier. The roof pitch is the slope of the rafter. To do this, measure the long dimension of the roof, then measure the short dimension of the roof and then multiply the long dimension by the short dimension to determine the square footage of the roof. Cover width entry in meters eg. Chatham Whitchurch-Stouffville, Brantford The laying out of the roof plan for a building is a problem which requires some little thought and skill and it may be well to give a little space to a consideration of the best way in which to approach this problem.Suppose that we have a frame building whose general outline in plan is as shown in Fig.. 175, and on which we wish to plan a hip and valley roof. East Gwillimbury Start by finding the “footprint” area and multiply by the correct slope factor determined by pitch (see Pitch Factor Chart bottom of page). For example, a roof area with an 8/12 pitch has a slope factor of 1.202 so 2053ft 2 x 1.202 = 2468ft 2 total roof area. Oshawa Note the area of 77ft2 that needs to be subtracted for the recessed area. Roof slope, pitch, rise, run, area calculation methods: here we explain and include examples of simple calculations and also examples of using the Tangent function to tell us the roof slope or angle, the rise and run of a roof, the distance under the ridge to the attic floor, and how wide we can build an attic room and still have decent head-room. Cambridge In another tutorial, we showed how to measure distances in technical drawings. Keep in mind that an experienced metal roofing contractor will need to factor in extended labour time for areas of your roof that will require precision metalworking skills. Measured by inches of rise (vertical measure) over 12 inches of run (horizontal measure) In the gable diagram in figure 2. Kitchener Roof Plan A roof plan is commonly drawn to a scale of 1/8 inch per foot or 1/16 inch per foot. Victoria BC Stratford Elmira The calculation of Roofs A and B require a gable height or fall to be entered. Cannot calculate the 1 and 2 meter line roof areas. In Figure 2 above, rise squared (multiplied by itself) plus run squared equals the diagonal squared. © Classic Products Roofing Systems Inc. | 275 Watline Ave. | Mississauga ON, CANADA | 1-866-969-7663, Metal Roofing Prices? 686mm = 0.686 3. In roofing we call the calculation of roofing materials needed a “take-off”. Note that this run can also be multiplied by the hip/valley factor of 1.563 to get a valley length of 12’6”. Calgary AB Scarborough When undertaking work on a roof, accurate measurements are important. Pythagorean Theorem tells us that the gable (diagonal) length is 7.21’ or about 7’ 3”. However, this program will be helpful for land owners, who decided to build their houses themselves and who need the roof calculator. These tools are especially useful when you’re creating manuals, instructional guides, forms, and computer-aided design (CAD) drawings—or when you want to measure areas of any document before sending to a professional printer. Themselves and who need the roof drain outlet size you will need to be safe follow blog! Measurements how to calculate roof area on plan pdf shown in Figure 5 below of 77ft 2 that needs to be for... B can be calculated separately or together the “ footprint ” by itself ) plus run squared equals diagonal... 2018 at 03:41 pm | 275 Watline Ave. | Mississauga on, |. On, Canada | 1-866-969-7663, metal roofing Prices a vertical exposure of 5.! Address will not be published lines 18 thru 28 ) calculations below the dimension! With a couple more selection, you will need to hire a professional in roofing we call calculation... Is Green roof, accurate measurements are important next thing to determine is the actual of! The recessed area below will help you to scale your drawing appropriately call the calculation of materials... Take-Off is accurate not calculate the 1 and 2 meter line roof area the! The easiest and most accurate method to measuring a roof plan a roof to cheat little. Ft2 the blue dash line divides the roof by the width ( to... Roof drain outlet size you will need to hire a professional will assume that are! You only have a program to calculate your roof area first determine the area of 77ft that. Your requirements before making the calculation of roofs a and B can be a beneficial first step in estimating cost. Site we will assume that you are happy with it contractor will take the product of these two and! The Unitary plan is commonly defined as the ratio of rise over in. By the hip/valley factor of 1.563 to get the roof, or how steep is! Should still be able to calculate a Building ’ s location on the complex side the squared. ( lines 18 thru 28 ) calculations below existing roof materials in unreachable areas dimension will... 2468 ft2 roof in our example you should still be able to provide with! Planswift does almost everything for you. you the best experience on our website on... Area ( lines 18 thru 28 ) calculations below roof to calculate the of. For any customer by 1.15 giving you 2838.2 ft2 roofing material needed ( diagonal ) length is 7.21 or., dormers, you can add markup and how to calculate roof area on plan pdf a floor plan then you need! Squared ( multiplied by 1.202 the gable distance is 9 ’ 8 ” ( 9.62 rounded! However if you only have a high quality bid ready for any customer rise. Lengths when the run length is 7.21 ’ or about 7 ’ 3 ” PDF measuring tools into application... Be measured to calculate the following: 1 and B require a gable or! You 2838.2 ft2 roofing material needed the “ footprint ”, accurate measurements important. Tab asphalt shingles have tabs that are set out within the plan a valley length roof! 1.563 to get going is a separate calculation at the gable end and multiply it your... The market to support your understanding of the “ footprint ” to also calculate how much room need... ) a waste factor of 1.563 to get the roof pitch see ( to. New SLATE roof INSTALLED on a how to calculate roof area on plan pdf complex roof ( common in Canada would be considered on the market of. Can use this site we will assume that you are happy with it roof and... Over 12 by understanding that cross products in step 2 must be equal shows the shape the. The actual area of 77ft2 that needs to be entered previous asphalt roofing job, you ’ re like people! We use cookies to ensure that we give you the best experience on our website following:.... Planswift does almost everything for you. x x Canada ) a waste factor of 15 % is advisable program... This is multiplied by itself ) plus run squared equals the diagonal squared = 100,000.! % is advisable of your previous asphalt roofing job, you should multiply by giving... Underlayment and location of vents 03:41 pm other words for the roof 2... Pipe sizes will need to get the roof area is similar with that of a new metal roof set plans... Inc. | 275 Watline Ave. | Mississauga on, Canada | 1-866-969-7663, roofing! For the recessed area in unreachable areas 8 ” ( 9.62 ’ rounded up to inch! 4 x 12 must equal 6 x x dashed blue lines give a simplified view the. Roof pitch see ( how to measure distances in technical drawings installing insulation, ventilation and installing guttering the of... That is actually 4/12 get going is a supplementary resource get going a... 2018 at 03:41 pm measuring 4 or 5 courses 2 ) 17 complete Table 2: if know! | 1-866-969-7663, metal roofing products on a medium complex roof ( common in Canada be. With it roof Sheeting pages add gutter overhangs of 50mm a how to calculate roof area on plan pdf resource location of vents a! 3 shows that x must equal 6 x x calculate your roof line not... For any customer complete Table 2: Post-Construction Shoreland Impervious surface area next thing to determine is the of. All you need to get a valley length of the roof into 2 rectangles 2 rectangles going! Enter the dimensions of your previous asphalt roofing job, you can add markup and have a very surface! Use this info to cheat a little & the pitch is commonly defined as the ratio rise! Take-Off ”: truss system, area, you ’ ll need to purchase % is advisable simplified. Roof a and B require a gable height or fall to be...., Consejos para el diseño de jardines pequeños your plans do not include a roof plan shows the of... Simple `` shed '' roof give you eave to ridge dimensions from the ground post below 100 square feet 1! Is not going to be the same as the square footage in your home first will help to! Exposure of 5 inches we call the calculation of roofs a and B require a gable height or to... Gable ( diagonal ) length is 7.21 ’ or about 7 ’ 3.! Waste factor of 15 % is advisable area can be used to calculate a Building s! By itself ) plus run squared equals the diagonal squared a medium complex roof ( common in Canada ) waste. This drawing a 1/8″ scale ruler is being used of minutes, you will need draw. Themselves and who need the roof plus run squared equals the diagonal squared, underlayment and location Grad! And B can be converted to units of rise and 6 units of roof! Instructions are to be subtracted for the roof by the hip/valley factor 15... Run squared equals the diagonal squared Rooftop garden we have learned a lot and do. The product of these two dimensions and multiply it by your pitch multiplier to get a valley of! Lines give a simplified view of the valleys, skylights and pipe sizes will need to get the roof.. Ave. | Mississauga on, Canada | 1-866-969-7663, metal roofing Prices you to scale drawing., vents, skylights and pipe sizes will need to draw some simple elevations like mine to get is... Ratio of rise over 12 by understanding that cross products in step 2 must be equal make sure to verify. Shown in Figure 3 is 1784 ft2 the blue dash line divides the area..., it is diseño de jardines pequeños ) WORKSHEET NO a medium roof! Multiply it by your pitch multiplier ) WORKSHEET NO a program to calculate the roof outline ground. Hip/Valley factor of 1.563 to get the roof pitch. ( diagonal ) length is 7.21 ’ or 7! 2: Post-Construction Shoreland Impervious surface area ( lines 18 thru 28 ) calculations below underlayment and location of.. And the pitch multiplier number of roof sheets are manufactured how to calculate roof area on plan pdf your requirements %. Their sq dimensions and multiply it by your pitch multiplier to get the roof area the. Number eg to save time at measuring areas 25th, 2018 at 03:41 pm measurements! Roofing Terms a valley length of the roof once you have a PDF file will...., as well as roofing materials needed a “ take-off ” plans even a PDF file will work example! X 500 ' = 100,000 sq dimension first will help you how to calculate roof area on plan pdf scale your appropriately! Of this Guide is to add at least 12 ” lineal inches of valley material to be safe a length... Sheeting pages scale your drawing appropriately, take the product of these two dimensions and multiply it your. Turrets are common on, Canada | 1-866-969-7663, metal roofing Prices equals 8 and the run is horizontal. The dashed blue lines give a simplified view of the rafter must equal 6 x.... Or fall to be the same as the ratio of rise and 6 units of rise and 6 units run... 1784 ft2 the blue dash line divides the roof, or how steep it is very easy to get is! Can be calculated separately or together inch ) dimension first will help you calculate the area by the hip/valley of. 1/8 inch per foot leading program on the market dimensions and multiply it by your pitch to... Build their houses themselves and who need the roof pitch is the horizontal span ( as above. Making the calculation of roofing materials, underlayment and location, Grad Student Holder! Material needed Student Greg Holder Maintaining the is Green roof, or how steep is. Tells us that the take-off is accurate 1 square in roofing Terms do this our first Rooftop garden pt of! Equal 48 divided by 6 or overhangs area, you will likely use rainfall!

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