Your roof should be measured by a qualified roofer. He will determine the number of field shakes in terms of squares, the linear footage of starter and linear footage of hip & ridge.  The order is then placed through your builder or roofer. Slate/Select does not provide estimates on quantity and accepts no responsibility for measurements and quantities other than the information provided by your roofer. Please be sure that the quantity ordered is correct. Shipping is expensive and adds additional cost for small reorders. No returns for excess are allowed.