BioMaderas Collar nuts


Our hand sorting

We only import decking that meets the highest international quality standards and comes from sustainable forestry. Before we ship the wood to our customers, each decking board is checked according to our sorting criteria. Here you can find out which criteria these are and what you can expect from our decking boards.

A side and B side of decking boards

Every plank is checked by us on both sides. Most planks are flawless on both sides. It is possible to lay both sides as a visible side here. If errors are found on one side, the other side is checked. If there are no defects, the plank will be shipped, otherwise the plank will be discarded. In the following we refer to the visible side as the A side, the underside as the B side.

Pay attention to the top and bottom of the decking

Our sorting criteria

Separation decking board

A split is a wedge-shaped splinter that can form on the long edge of a plank. Planks with a split on the A side are sorted out by us. These may occur on the B side as they do not impair the constructive stability of the plank.

Knotted decking board

Firmly grown knots are sorted out neither on the A side nor on the B side. Hollow knots on the A side are discarded. On the B-side they are tolerated if they are not consistent.

Floorboards may show minor damage at the end due to transport or cutting. Therefore, the planks are usually delivered slightly oversized. If the damage is so severe that a correct catalog size can no longer be achieved after cutting, the plank will be sorted out.

Wide decking boards

Depending on the humidity, the widths of the decking boards change slightly. Such natural changes in width are not sorted out. However, if the width is too small or too wide due to an error in planing, the plank is sorted out.

plank length

Decking boards are usually supplied with a slight oversize in length. This means that it is still possible to eliminate transport damage at the end of the plank and still install the plank in the dimensions specified in the catalogue. Planks that do not reach the length of the catalog dimensions are sorted out.

plank thickness

The plank thickness can vary by a tenth of a millimeter due to humidity and temperature changes. If the plank thickness is different due to an error in the planing (as shown), the plank will be sorted out by us.

Decking end plan

End cracks can occur on the cut edge of the decking boards. Good drying and front edge wax reduce the risk, but cannot completely eliminate it. If the end crack is so deep that the plank can no longer be installed in your catalog dimensions despite the excess length after cutting, it will be sorted out.

No decking board is like the other. Planks of the same type of wood also differ in colour. Therefore, the decking boards are not sorted according to their colour.

Odor decking

Some types of wood can develop an odor - especially when it is freshly laid and when it is warm and damp. This is one of the typical properties of wood. Planks are not sorted out because of their smell. The smell usually goes away after a few days or weeks.

Drill hole decking

A hole larger than 3mm in diameter may be caused by a moisture meter, a bore or an insect. Such holes are sorted out on the A side and tolerated on the B side. The holes can be closed with a round rod. An acute insect infestation can be ruled out due to the natural properties of tropical wood.

Planing defects are indentations or burn marks caused by the planing machine. Planing errors on the A-side of a plank are sorted out. On the B-side they are tolerated.

In production, in rare cases, holes are closed with a wooden spatula. We try to sort out the planks that have been filled on the A side. Because the filling has sometimes been implemented very well and is hardly recognizable, it can sometimes be overlooked.


No floorboard, no wooden panel and no cutting board is like the other - even if it is made of the same wood. Annual rings differ in color and arrangement. It is not possible to sort according to specific grains.

Scratch decking

Scratches can occur during storage or transport. A deep scratch (as shown) on the A side will be rejected and tolerated on the B side. Slight scratches, which can be removed with a simple abrasion, are tolerated.

Surface cracks decking

These are superficial cracks that do not go through the full thickness of the decking. Surface cracks can occur in floorboards after long periods of drought, are among the properties typical of wood and are not sorted out. Decking oil reduces cracking.

These are very small holes, less than 3mm in diameter, and tend to appear in clusters. Pinholes are caused by insects in the tropics. To a small extent (up to 10 pinholes per meter), pinholes on the A side are tolerated because they do not pose any structural restrictions. A higher occurrence of pinholes on the A-side is sorted out. Pinholes are tolerated on the B-side.

Decking boards differ in their surface structure. Some planks can be a little rougher or fine wood fibers can stand up after weathering. This roughness is a characteristic of wood and is not sorted out. In the case of boards that are perceived as too rough, we recommend sanding them down with a 120 grit after the first weather exposure.

Slate is a wedge-shaped split or peeling off of the decking boards. Slate boards are sorted out by us. However, it cannot be ruled out that the floorboards will slate after installation and for a longer period of time outdoors.

Sapwood decking boards

Sapwood is the younger growth wood and occurs at the edges of a tree. Planks with a sapwood content of more than 5% on the A side are sorted out. Planks with a sapwood content of more than 20% on the B-side are also sorted out.

Decking boards are stacked with batts to prevent mold stains and to increase the stability of the stack. This can cause discolouration on wood that darkens. However, since these disappear under weathering, discoloration from wooden battens is tolerated.

Dirt decking

During transport and storage, water stains can form on the floorboards, for example due to condensation. In rare cases, there may also be traces of paint, chalk marks or residues of adhesive tape on the floorboards. Since these blemishes can be removed without much effort - for example with soft soap - dirty floorboards are not sorted out.

Solid wood can warp due to changes in temperature and humidity. A vertical distortion (left-right) of the plank of more than approx. 2% is usually sorted out. However, distortion can also occur during transport and can be blocked in most cases. A horizontal warpage (up-down) or less vertical warping is tolerated, since these planks can be straightened and installed without any problems.

A changing direction of growth of the wood fibers is referred to as interlocked grain. As a result, not all wood fibers are planed off smoothly during planing and strip-like color changes can occur. Interlocking grain is not sorted out because it is one of the typical wood properties. The fibers can be smoothed by grinding.

Our decking boards

ab 6,10 

excl. Shipping

ab 8,75 

excl. Shipping

ab 11,50 

excl. Shipping

ab 9,10 

excl. Shipping

ab 9,10 

excl. Shipping