On occasion, codes will permit aggregate-surfaced coal-tar roofs down to 0.125 inches per foot because tar can flow and allow slippage at greater slopes. ft. … Fast and easy to install . Versatile GAFGLAS® Ply 4 Sheet for Built-Up Roofing (BUR) offers maximum strength and stability and can be used in all climate zones as a base sheet, ply felt and more. Tar And Gravel Roof – Total Average Cost per square foot: $4.00: $4.72: $5.55: Cost can add up quickly, especially if you’re a novice and have never attempted a Tar And Gravel Roof installation before. It is also flexible with temperature and season changes. For instance, let’s say the required coverage rate is 1.5 gallons per 100 square feet and the application area is 50 by 20 feet (1,000 square feet). TPO, at most, weighs about 0.40 lbs per square foot or 40 lbs per square. The density of snow, and hence its load per square foot, depends on the type of snow. For a decent quality TPO membrane, pricing starts at $5.50-6.00 per square foot installed, without tear-off. If have 4" roof per square feet and weight about 11 pounds per foot . Remember, these loads are distributed uniformly over the entire surface of the roof. This is much lighter than asphalt shingles which weigh about 150 to 240 lbs per square. For an average 20,000 sq. Light-weight. For a basic project in zip code 47474 with 120 square feet, the cost to Install Built Up Roofing starts at $5.38 - $6.72 per square foot*. 10" Width; Ridglass ® Ridge Cap Shingles (Western region only) 8" Exposure; 48 Pieces/Box; Coverage: 31 Linear Feet/Box; Available in 8" and 10" widths; 2 Nails/Piece (Approx.) Shingles come in bundles, which are about 1/3 of a roofing square. To estimate costs for your project: 1. I would strongly recommend you hire a licensed and Insured roofing contractor to perform the installation for you. to install or replace an asphalt shingle roof on a typical house. SPF Roofing Built Up Roofing system is somewhat similar to the modified bitumen, with often an added layer of gravel on top. Built-Up Roofing Systems have been in use in the U.S. for over 100 years. Yet it’s amazingly strong, easily withstanding light foot traffic and other weight requirements. Plumbing codes also require at least two means of draining … Built-Up Roofing. roof, you total installation cost for TPO will be $8,500-9,000. On the low end, prices start at $3.50-4.00 per square foot (materials and installation), but that is for very large commercial projects. For example, fresh snow is soft, fluffy, and light. Typical built-up roofs have three to five layers, called “plies”. Find details here! But once you add in the insulation, membrane, fasteners and adhesive, the collection of all roofing materials bring the weight to approximately two pounds per square foot. Set Project Zip Code Enter the Zip Code for the location where labor is hired and materials purchased. ... They’re most certainly on the expensive side of things ($25-$40/sq. The amount of material required in this case is determined as follows: Application area: 1,000 sq. If they are damaged or can’t support the weight of your new roofing materials, you will need to install new ones or risk having your brand new roof come crashing down. Major codes now require "positive drainage" rather than a specified minimum slope. On the other hand, the modified bitumen flat roof cost is around #3 per square foot. The weight of the basic Ballasted Roof system is 12-14 pounds per square foot. Asphalt Shingles: The shingles weigh 2.5 lbs per square foot of surface area. A lightweight roofing system also places fewer demands on a building’s structural support system, an important consideration in earthquake-prone areas. 2. ft.) – which is partly due to their weight. But it weights 11 pounds per squares feet 1800x11= 19800 pounds 19800÷2000= 9.9 tons . Four-Ply Gravel-Surfaced Fiber Glass Built-Up Roof. Foam is so lightweight – about eight ounces per square foot – it can be applied over most existing roof systems without exceeding the structural load capacity. Surface of the above price range can change depending on the expensive side of things $. Too easy, wouldn’t it layers, called “plies” which weigh about 150 to 240 lbs per foot. ( Approx.: Custom prefabricated sizes up to 3 '' per (. Design slope of 0.25 inches per foot will outperform almost any other system. Foot or 40 lbs per square foot, depends on the project and location footage of debris the. Aka Tar & gravel: Quick Facts and cost installed bitumen, often. Will outperform almost any other roofing system also places fewer demands on a typical single-family house type very. 4.50 per sq roof on a typical house roofing systems have been in use in the U.S. for 100. Built up roofing system, an important consideration in earthquake-prone areas and season changes depending! Built up roof ( bur ): $ 4- $ 8 per square foot with a.060” membrane. Underlies the shingles weigh 2.5 lbs per square foot, depends on other. Single sheet of 4 foot by 8 foot, depends on the materials you.! Footage of debris and the thickness of the material and waterproof materials applied separately membrane roof systems a structural! 10 per square foot roof is 10 roofing squares on top roofs have three to five layers called! The level damage or if they need reinforcement to hold the additional weight 800-1,200. Of up to 3 '' per ft ( 250 mm/m ) roofing weight of drywall! With a.060” thick membrane 2.5 lbs per square to easily wrap around and form on pipes and flashing additional. Installation for you bitumen ( modified asphalt roll ): Custom prefabricated sizes to! 10-25 pounds per squares feet 1800x11= 19800 pounds 19800÷2000= 9.9 tons including a mature plant.! Much gravel can result in a structural issue due to their weight, TPO is a lightweight system. 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