Puidukoda Timber Quality – Timber Grades and Grading Selection
Exterior Painted Timber Cladding Puidukoda UK Ireland
External Wall Cladding Puidukoda
Softwood Decking
Siberian Larch decking Puidukoda
Black Painted Wall cladding Puidukoda
Most of the confusion on timber quality tends to revolve around the number and size of knots etc. We have included some of the information to guide you through this process.It is important to note that most of the coniferous softwoods used for decking and cladding will have knots e.g decking, cladding, flooring. What is very important is the size and the need for them to be firm/tight/ solid and not loose, if the presence of knots is an issue the other alternative will be to apply solid / opaque finishes etc or utilise shorter lengths.All our bulk or wholesale softwood timber is graded into two main use applications i.e. Visual Grade for appearance purposes only used for cladding facades/linings/weatherboard, decking, flooring and mouldings, and according to Stress Grade or Structural Grade selected for load-bearing applications, joists, support beams, carcassing.
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Our Visual Timber Quality is based around the Nordic Grading Rules -Nordiskt trä – 1994 (The Blue Book) and our own grading rules classified into, e.g. AB, BC, C. In visual Grading a number of appearance or visual characteristics, features are taken into consideration, e.g. Knots, splits, Checks, Wane, pitch or resin pockets, insect damage, fungal attack, discolouration, twist, cupping (distortion) etc. Please see our standard softwood grading rules are given on below.
Interior Timber A Grade Quality
Timber AB interior Grade quality
AB exterior quality acceptable
Timber Quality B Grade example
Timber ABC Quality example
We can Grade to other visual specifications on request; We can offer to grade to customers specifications if required. It is always important to note that European Mills or Graders do not normally Grade to grades or standards given in BS1186-3:1990 section 4 Class CHS, 1, 2, 3 or BS8605, BS EN 942: e.g. J2, J5, J10, J30,J40,J50 Timber in joinery – General classification of joinery quality etc. It is essential to differentiate the Grading rules to such as GOST Russian Standard 26002-83 – U/S (I-III) UNSORTED, S/F (I-IV) SAWFALLING, FOURTHS (IV TH) Vth VIth Which we can also supply if required on request. A general overview of our grading rules compared to the GOST grading rules is given below for comparison:
| Intended use location (Application)
Internal or External |
Quality Description
Refer to Puidukoda Grades PDF for more information and Request images for examples |
Examples of Products sold in the timber quality Grades | Raw material grade used
As specified in Russian Timber Grade GOST 26002-83 To produce Grade U/S (I-III); S/F(I-IV); Fourths (IV); Fifths (V); Sixths (VI) |
General 5% Rule for variation in qualities or grade |
| External / Outside of the house (building) | “Exterior Cladding weatherboard, facade” AB grade | All 18-21mm thick materials from Puidukoda in AB grade | SF/SF+VI
Sawfalling, fifths, sixths Grades |
Always allow appx 5% variation of quality within the batch of the specified Grade as an acceptable tolerance/variation |
| Internal / Inside of the house (building) | “Interior and Flooring” AB grade | Interior and Flooring products
9×96 Interior 12×120 Interior 28×145 Flooring 40×245 Flooring |
US/SF
Unsorted and Sawfalling |
|
| “Interior and Flooring” A | US/SF
Unsorted and Sawfalling Grades |
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| “Interior and Flooring” A+ | US
Unsorted Grade |
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| Internal or External application | quality ABC | 20×195 PTGH and 28×145 Loglap (weatherboard, cladding,lining façade,rainscreen) | US/SF/SF+VI/V-VI
Unsorted, Sawfalling, Fifths and Sixths |
|
| Internal or External application | quality B | Available on accumulation only | V-VI
Fifths and Sixths |
|
| Internal or External application | quality C | Available on accumulation only | Sorted out as Low-Grade material |
Our strength stress graded timber/joists C24 are considered as Premium as we do not grade for strength only as required by law but also grade for visual appearance as A/B Grade. CE Marked High-Quality Premium C24 strength graded softwood timber joists (structural timber carcassing) is regularised (reg) planed treated -Tanalised or can be supplied untreated if required. We supply Ex-Stock up to 6.0mtr long, we can supply C16 on request, sizes based on BS EN336:2006 Structural Timber, BS EN 14081-1, BS 4978:2007+A2:2017 Visual strength grading of softwood. Specification,BS EN 1912 (BS 5268:2007, withdrawn replaced by BS EN 1995-1-1:2004+A2:2014)