5 ft by 9 ft is 45 square feet. This requires 6,480 square inches to cover it.
140
A Standard roll of 30lb felt will cover 2 square or 200 sq ft
2 yards
945
8.75lbs
5 ft by 9 ft is 45 square feet. This requires 6,480 square inches to cover it.
300
140
About 1500 sq ft
A Standard roll of 30lb felt will cover 2 square or 200 sq ft
81
2 yards
945
150 ft
8 tiles
The answer depends on the depth to which you wish to cover it.