Yes this formula works. If I am building a 4-sided roof with a peak in the middle, creating 4 triangular roof sections, what is the formula for achieving a 1:4 slope ratio? field : perimeter . To calculate the Effective Roof Area you should use this formula: Roof Length X Half Roof Width X Roof Height ÷ 2 = Roof Area. Once the area is known, divide by the area of a 4×8 sheet to find how much sheathing is needed. Take the horizontal measurement from the wall line to where the peak will be, and divide that by four. Roughly speaking, 1 millimetre of rain over 1 square metre of roof equals 1 litre of water. Here is the online hip roof area calculator which helps you calculate the hip roof parameters such as roof rise, common and hip rafters length and roof area based on width, height of roof base and the roof pitch (identical for all sides). The roof area for a hip end is the same as for a gable end, the intersection is equivalent to a hip (slightly conservative), so there is usually no need to consider triangles when measuring a roof. If you are using standard asphalt shingles , your price will be lower than if you are using more expensive slate, metal or tile shingles . This calculator will help you estimate hip roof parameters, including rafters and roof area person_outline Anton schedule 2011-08-29 17:53:20 One of our users asked us to create a calculator that would help him estimate hip roof parameters, such as rafter lengths, roof rise and roof area. Gable & Hip Roofs will have the same area provided that the pitch remains the same. In addition, you will need to take into account the materials being used. If you have a roof section that's 30 feet (9.1 m) long and 12 feet (3.7 m) high, multiplying those dimensions would give you an area … Hip roof is a roof with a sharp edge or edges from the ridge to the eaves where the two sides meet. (b) If the area of each square tile is , find the number of tiles and right triangle tiles necessary to fully cover the roof. Our roof calculator uses “base length” and “base width” to find the estimated area. New Flat Roof \$8,225 Pitch is thus the ratio of the rise in inches to a 12-inch run, and is often expressed using a semicolon, for example 6:12. Calculating Ventilation Area. The roof pitch multiplier is a number that allows you to find the total surface area of your roof. You must remember that this is the best case calculation. The calculation behind this factor is that it is the square root of ((rise/run)2 + 1). Calculating Ventilation Area of Attic Kitchen | Ventilation text: Tim Carter. Let's use the following simple ranch house for an example. Carpenters prefer to use Pitch in calculations instead of rise and run. New Metal Roof \$14,500 Average price. Our calculator results show your roof area, material details and their cost per square foot, plus the total estimated cost of a new roof including materials and installation expense. ROOF AREA . Roughly speaking, 1 millimetre of rain over 1 square metre of roof equals 1 litre of water. Roof pitch can also be defined as the vertical rise divided by its horizontal span (or run). It provides an actual area of any roof. The roof area calculation for sizing roof drains is an example of how differences among the codes can challenge the designer. Calculate the Area of a roof for buying shingles. This will provide an area calculation for clay or concrete roof tile, natural or composite slate, underfelt or breathable felt and ridge length. New Shingle Roof \$7,500 Average price. It is sometimes called the roof pitch multiplier..