3 ms·
Not any more then a standard asphalt roof, which is basically what you are describing. Course aggregate mixed with simmering to hold it in place. The flat part
by mtnGoat 4y ago
Not any more then a standard asphalt roof, which is basically what you are describing. Course aggregate mixed with simmering to hold it in place.
The flat parts of each step slow the waters downward momentum much better than a slope would.