Oak Grading

For oak beams/timber, the grades basically describe appearance quality and structural strength. Habitable buildings are usually constructed from QPA grade and Garages and shelters from QP1.

Different grades - different quality

QPA - highest structural/visual grade QP1 - good structural grade with more character QP2 - lower appearance grade, more knots/defects, usually non-structural or decorative Here’s the practical difference:

QPA

• Cleanest beams • Tightest grading rules • Smaller knots allowed • Less grain deviation • Few visible imperfections • Common in high-end oak framing and exposed beams Equivalent to around D30 structural grade.

QP1

• Still structurally usable • More natural character permitted • Larger knots and some discoloration allowed • Most common grade for structural oak frames Equivalent to around D24 structural grade.

QP2

• More rustic and appearance-led • Bigger knots, shakes, sapwood, and defects accepted • Usually cheaper • Often used for mantels, decorative beams, garden structures, or furniture where “character” is desired QP2 is less consistently defined between suppliers, but it is generally considered below QP1 in quality.

Grade

Quality

Appearance

Structural strength

QPA

Premium

Few knots, cleaner grain, fewer defects

Highest (roughly D30)

QP1

Standard structural

More knots and character allowed

Good structural (roughly D24)