Sq feet is the length of the material multiplied by the width of the material. Linear feet is just the length of the material. So ,because roofing material is measured in the length measurement ( the width is pre-set coverage) if you are paying for a sheet that is 20ft long and covers 3ft you will be paying for 20 linear ft
IF you buy 4 x 20 ft sheets you will be be paying for 4 sheets and they will cover an area of 240 sq ft ( each sheet covers 60 sq ft so 4 sheets =240 sqft
to get the answer to your question you will have to know the length of the sheet and the width so that the area covered by a sheet can be known
Assuming that it is a roof area you want to cover, measure the length of the sheet required to cover the length of span ( gutter to ridge cap) and the width of the roof ( front to back) and divide that by the width of a sheet will give you the number of sheets required. Now multiply that number of sheets by the length of 1 sheet will give you the linear ft of the area to be covered.
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