These are profiled wall elements of residential houses made from glued or solid timber. Laminated logs consist of two to four lamellas, the thickness of which is selected depending on the necessary dimensions of the wall element. The dimensions of the pre-cut wall elements can be up to 240 x 240 mm.
Wood species – spruce, pine.
Moisture: 12% +/-2%.
Strength class: GL24, GL28, GL32.
Width – 80…240 mm.
Height – 100…240 mm.
Length – up to 18 m.
Prepared according to recommendations of German Laminated-Wood Research Laboratory (Association)(Studiengemeinschaft Holzleimbau e.V.).
Special requirements or criteria (other, not specified below) are the subject of agreement between the supplier and the buyer, i.e., they are additionally stated in the specifications of the supplied product and descriptions.
|
Criteria |
Industrial quality |
Standard quality
|
Selected (extra) quality
|
1 |
Firmly grown knots
|
Permitted |
Permitted |
Permitted |
2 |
Fallen and loose knots with bark remnants
|
Up to Ø ≤ 30 mm permitted, from Ø > 30 mm to be replaced in the works |
Up to Ø ≤ 20 mm permitted, from Ø > 20 mm to be replaced in the works |
Replaced in the works. Not replaced in the works if up to Ø 5 mm in diameter. |
3 |
Resin galls Delivery condition |
Permitted |
Up to 5 mm wide resin galls are permitted |
Up to 3 mm wide resin galls are permitted |
4 |
Faulty points improved by means of “ships” or knot hole plugs |
Not necessary |
Permitted |
Permitted |
5 |
Knots and cracks improved by means of filler compound Number of improvements not limited |
Not necessary |
Permitted To be agreed with the client |
Permitted To be agreed with the client |
6 |
Insect attack, bore holes
|
Burrows are permitted up to 2 mm |
Permitted bore holes up to 2 mm |
Not permitted |
7 |
Pith |
Permitted |
Permitted |
Pith not permitted in visible surfaces of external lamellas |
8 |
Cracks caused by shrinking Delivery condition |
Not limited |
Up to 2 mm wide |
Width – up to 1 mm |
9 |
Discolorations as a result of blue stain, red and brown stripes Delivery condition |
Not limited |
Up to 10% of the whole structure component visible surface area |
Not permitted |
10 |
Mould Delivery condition |
Not permitted |
Not permitted |
Not permitted |
11 |
Contamination of the surface Delivery condition |
Not permitted |
Not permitted |
Not permitted |
12 |
Distance between finger joints |
Not limited |
Not limited |
Distance between finger joints of visible external lamellas min. 0.7 mm. |
13 |
Surface |
Unplaned areas are permitted up to 5% of the surface area if not deeper than > 3 mm |
Planed, edges slightly chamfered. Planed chatter permitted up to a depth of 1 mm. |
Planed, edges slightly chamfered. Planed chatter permitted up to depth of 0.5 mm. Surface can be polished by separate agreement. |
14 |
Grown in bark |
Permitted |
Width up to 10 mm, length up to 60 mm |
Not permitted |
15 |
Rip-outs |
Permitted |
Depth up to 2 mm, diameter up to 15 mm |
Not permitted |
NOTES:
1.The depth of the crack may be, independent of the visual quality class of the surface for structure components, for members not being subject to tensile-stresses perpendicular to the grain up to 1/6 of the width of the structure component, for members being subject to tensile-stresses perpendicular to the grain, up to 1/8 of the width of the component.
2.If visual surface quality class is not specified in the order, products of standard surface quality are supplied.
Compared with solid wood, glued laminated timber is mainly a crack-resistant wooden material. Cracks on the surface caused by changes and fluctuations in the climate or environment are inevitable. Thus, they are not a considered a defect and are permitted and have no impact on strength of the structure component.