Green Oak - QPA grade

Superior Grade (QPA)

Fresh sawn 'green' oak is avaialable in several different grades, each grade being suited to specific applications. QPA grade requires:

Sawn timber with sharp edges, no wane, with tolerance of small quantities of sound sapwood on two edges maximum, if it covers less than 15% of the width of the faces and the edges.

Slight traces of heart on one face tolerated. Enclosed heart permitted, black streaks tolerated on 10% of the pieces of the batch.

Sound knots are permitted, as long as the diameter of each one does not exceed one third of the width of the face or edge.

Two sound dead knots with a diameter of <15 mm per metre are permitted.

Not acceptable: Heart shakes, ring shakes, frost cracks, curly grain, bark pocket, enclosed sapwood, stain, bore holes, red heart, brown rot.

Slope of grain < 7% permitted on one face and must not exceed 10%.

Image kindly provided by a client, Richstone Contracting Ltd.