Classic C decks are machined on four sides. They are characterized by a short tongue (KP), which creates a smaller V-shaped joint when knocked together. The decks are connected by a tongue and groove system.

Quality of AB timber decking

AB grade timber decking comprises 40% A grade (highest quality) and 60% B grade (graded to standard). The decking is dried to 12-16% moisture content.

Covering width of the timber decking

The covering width of the decking is less by a pen, which is approximately 8 mm less of the total width.

Example: For a 23×146 (thickness × width) decking, the covering width is 138 mm (146 mm - 8 mm = 138 mm).

Tip: Always allow the wooden decking to acclimatise (at least 14 days) in the place where you will be fixing it. This will avoid unwanted swelling or shrinkage of the decking due to other ambient moisture.

Installation of AB Klasik decking

Use the screws to simply attach the decking. The decking is untreated and the wood needs to be given a protective coating. The decking will be protected from wood-destroying fungi, mould, insects and moisture.

Tip: The facade cladding must always be at least 40 cm from the ground. If you are going to fix the decking horizontally, the groove must point downwards (this will prevent water leakage).

What screws to use for decking

When using screws or nails, it is important that their length is at least twice the thickness of the decking.

Tip: Do not force the decking together and keep a 1mm gap between the tongue and groove. The wood is constantly working and will swell with increased humidity/temperature and vice versa.

Don't overlook: if you want to learn more about installing decking, take a look at our simple guide to adding decking.

Read about timber decking on the blog

• How to choose interior decking?
• What is the difference between AB and BC grade decking?
• How to install timber decking? (Photo guide)