Joist

The wooden decking joist as a decking substrate

The Woodup wooden decking joist is a natural and durable product. Get your joists at an exceptional value for money. No need to travel — order your decking joists online and receive them at home 10 days later. Choose a Douglas fir joist, naturally protected against insects and mould, or a treated joist. Our decking joists and all our timber are available in rough-sawn or planed-all-round finish.

What is a wooden decking joist?

A wooden decking joist is a longitudinal piece with a square or rectangular cross-section. Joists are structural elements. They are used to build the framework of a deck. Fixed at the perimeter and in the centre, the joist supports the decking surface of boards (solid wood, composite wood). Its resistance allows it to bear loading. The dimensions of the joists facilitate the fixing of boards by screwing.

How to choose wooden joists for decking?

The primary quality of a wooden decking joist is its resistance. This quality parameter is decisive when choosing a wooden joist. Furthermore, the joist is close to the ground. It is exposed, both in summer and winter, to moisture and temperature variations. Treatment is the second important criterion when choosing your joists. The third criterion is the cross-section, defined by the dimensions and quality of the decking boards.

Choosing your joists according to wood quality

Joists are the load-bearing structure for decking boards. To make your deck safe and avoid accidents, choose quality joists. It is better to compromise on the quality of the boards than on that of the joists. Placed on foundations, joists are the framework of decks — do not forget that.

Choosing a wooden joist according to use class

Joists are placed at a sufficient height above the ground to avoid direct contact. However, they are susceptible to the combination of water and heat. This environment is conducive to mould and wood-boring insects. Choose use class 3 or 4 joists or Douglas fir joists.

Choosing a wooden decking joist according to its cross-section

The choice of cross-section depends on the height of the deck substructure (difference between the finished deck level and the ground). However, the board spacing and type of boards (composite wood, exotic wood) also define the cross-section of the joists. Expert advice is invaluable for choosing the right joists according to the type of decking.

Characteristics of wooden decking joists

The wooden decking joist is sold in various cross-sections and lengths. Furthermore, joists are elements made from different wood species: exotic or softwood. Finally, joists are available in certain resistance classes and offered with or without treatment.

Dimensions of wooden decking joists

Finding the right dimensions for your decking joists is useful for achieving cost-effective joist spacing. Here are the main dimensions available.

Joist length: 120 to 300 cm.
Joist width: 3.8 to 150 cm.
Joist thickness: 3.8 to 8 cm.

Wood species for decking joists

Joists are available in exotic wood: baddi, wallaba or padouk depending on the manufacturer. The softwood joist is the most economical structural component. You will easily find joists in Scots pine, red pine or Douglas fir. Composite wood decking joists are also available.

Use class and treatment of decking joists

Manufacturers offer treated softwood joists. Given the positioning of the joist, autoclave treatment is the most common. In this case, the joist is use class 3 or 4. Douglas fir or exotic wood joists require no treatment, as they are naturally protected.

The particular features of the Woodup wooden decking joist

Woodup offers wooden decking joists in Douglas fir. It is a wood species renowned for its high quality and resistance. Our joists are robust and stable supports for your decking boards. Our sawmill uses species sourced from PEFC-certified French and European forests. You can choose between rough-sawn and planed-all-round joists. On request, we also deliver joists in other softwood species.

Delivery of your wooden joists and other Woodup products

Choose durable Woodup wooden joists. For three generations, we have been manufacturing and distributing timber products (structural timber, staircases, cladding). Order your wooden decking joists online in just a few clicks. Pay in 3 interest-free instalments securely with Alma. Receive your joists at home within 10 days and benefit from fair delivery pricing based on the weight of your order. Do you have questions about our products? Ask our experts via our contact page.