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What kind of line is used to indicate the supporting beam

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User Xameer
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Built-up roofing, also called BUR, is the most common roofing material used on low-slope roofs. It is composed of alternating layers of reinforcing fabric and bitumen (asphalt) and is finished with a top layer of aggregate, such as stone or gravel.
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User Alan Ocallaghan
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Answer:horizontal

Explanation: because it is supporting it

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User Jenel
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