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Oak Beam Grading Service
Posted in General Information by Admin on March 7th 2013

We employ 3 BM TRADA certified graders on site who are able to grade freshly sawn oak beams to THA (D40), THB (D30), TH1 (D30), or TH2 (D24) strength grades.

THA grading will cost an additional 20% of the price of QP1, and THB grading will cost an additional 10% of the price of QP1. Please use our oak beam cost calculator for pricing.

Explanations of our three most popular grades are given below.

QP1 Grade (First Grade)

All our structural oak beams are graded to QP1 as standard.

QP1 grade beams have a minimum of 3 straight edges with tolerance of a small amount of wane to one edge (with slight tolerance of wane on two edges maximum if the minimum width exceeds 90% of the width of the piece.). Slight traces of heart tolerated on two faces. Enclosed heart permitted. Sound knots are acceptable, as long as their diameter does not exceed one half of the width of the face or edge. Two sound dead knots are permitted per linear metre as long as their individual diameter does not exceed one quarter of the width of the face or edge. On 10% of the pieces of the batch black streaks, brown rot, curly grain, bark pockets can be present. Some black bore holes can be accepted. Heart shakes, ring shakes and frost cracks are permitted on the ends of the pieces, as long as they do not appear on the faces. Face shakes tolerated.

They will have no insect damage (with the exception of pinholes left by ambrosia beetle), no active infestation of insects, or other detrimental characteristics. QP1 ticks every box for the construction industry and sympathetic period property restorers.

THA Grade (D40 Strength Class)

This is the UK equivalent to QPA grade.

Knots - Not greater than 0.2 of the thickness or width to which it relates.
Longitundinal Separation Of Knots - Knots accumulative if longitudinal separation is less than twice the width or 300mm (whichever is lesser), or when the grain has not fully recovered.
Slope Of Grain - Not greater than 1 in 12. Within 500mm of ends not greater than 1 in 6.
Fissures (Through The Thickness) - Only permitted at ends with length not greater than the width of the piece.
Fissures (Not Through The Thickness) - Not greater than 1m or a quarter of the length of the piece.
Wane - Full edge and face dimensions may be reduced by up to one third of the dimensions of the piece. Length of wane is unlimited.
Distortion (Bow) - Not greater than 10mm over a length of 2m.
Distortion (Spring) - Not greater than 8mm over a length of 2m.
Distortion (Twist) - Not greater than 1mm per 25mm width over a length of 2m.
Cup - Unlimited.
Bark Pockets - Within 500mm of the ends, not greater than the width of the piece. Elsewhere not greater than 1.5 times the width or 0.2 times the length of the piece, whichever is the lesser.
Biological Damage And Other Defects - Worm holes and pin holes are permitted providing they conform to the requirements in 4.8 of BS 5756: 2007. No active infestation is permitted. No decay is permitted other than in unsound knots. Stain free from decay is permitted.

The length of fissures and the amount of distortion are linked with moisture content, therefore, the limits given can only be applicable at the time of grading.

THB Grade (D30 Strength Class)

Knots - Not greater than 0.75 of the thickness or width to which it relates.
Longitundinal Separation Of Knots - Knots accumulative if longitudinal separation is less than twice the width or 300mm (whichever is lesser), or when the grain has not fully recovered.
Slope Of Grain - Not greater than 1 in 4.
Fissures (Through The Thickness) - Only permitted at ends with length not greater than the width of the piece.
Fissures (Not Through The Thickness) - Not greater than 1m or a quarter of the length of the piece.
Wane - Full edge and face dimensions may be reduced by up to one third of the dimensions of the piece. Length of wane is unlimited.
Distortion (Bow) - Not greater than 10mm over a length of 2m.
Distortion (Spring) - Not greater than 8mm over a length of 2m.
Distortion (Twist) - Not greater than 1mm per 25mm width over a length of 2m.
Cup - Unlimited.
Bark Pockets - Within 500mm of the ends, not greater than the width of the piece. Elsewhere not greater than 1.5 times the width or 0.2 times the length of the piece, whichever is the lesser.
Biological Damage And Other Defects - Worm holes and pin holes are permitted providing they conform to the requirements in 4.8 of BS 5756: 2007. No active infestation is permitted. No decay is permitted other than in unsound knots. Stain free from decay is permitted.

The length of fissures and the amount of distortion are linked with moisture content, therefore, the limits given can only be applicable at the time of grading.

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88 Comments
INAAM KAMAL SHEHADEH September 6th 2015 12:09:11 PM
HI I am looking for 84 c.meter OAK WOODS 7000 mm * 500 mm * 120 mm deadline for RFQ NOT LATER THAN 8/9/2015 Dear sir , Kindly quote your best prices on FOB + C&F Aqaba Seaport , advising the approximate weight , origin of goods and port of shipment for the items as per listed below :. Awaiting your quotation not later than 8/9/2015 provided that prices should be valid for 90 days , we prefer payment to be affected on CAD basis. * Please be noted that our commission shall be included in your proposed price (5-10 %) .
steven.keep@rbs.co.uk October 9th 2015 11:34:38 AM
Hi I\'m looking to replace some old oak windows where the window has failed but the casement is still sound. 75mm*75mm - multiple lengths that I will router as required. Which oak should i be looking for or should i phone in my details Thanks Steve
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Stephen Callahan May 3rd 2014 10:10:27 AM
tel 07833130662 i\'m looking for a 4.8m D40 4 year felled oak beam 250mm x 250mm. Do you have this in stock? Many thanks
Ian court August 26th 2015 07:42:05 PM
Hi I am looking for 2no oak beams 1no 150mmx150mm and 150mmx175mm both2000mm long for structural beams on a grade 2 listed building
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"My name is Mr. Rizkalla and I have used UK timber on at least five occasions. I am emailing to inform you that my experience of your service has been excellent. From telephone support to drivers, delivery and product; you really do provide very good customer care. I have therefore recommended you to all my friends and colleagues. Many thanks from a very satisfied customer. Best wishes Kind regards Nagy Rizkalla. "

Nagy Rizkalla