Quarter Sawn lumber possess avantages over plain sawn lumber because of the orientation of the growth rings. Because the growth rings in quarter-sawn wood run uniformly parallel along the entire board the wood does not shrink and expand with seasonal variation in moisture as much as flat sawn wood. In addition because of the orientation of the growth rings, quarter-sawn wood is less prone to shrinkage, twisting, cupping and in many cases rot because sap wood is easier to isolate in manufacturing process. Purchasing quarter-sawn wood often requires direct contact and contract with the sawyer.