Substructure of a wooden terrace

Spacing of the substructure rows

The axis dimension (measured from center to center) of the substructure rows should not be more than 50 cm, so that the decking boards can be screwed on often enough and the risk of warping of the wood is minimized. The substructure should not lie flat on the substructure. A ventilation distance can be created with terrace pads or adjustable pedestals.

Plan for shearing area

A spacer profile creates a gap between the substructure and the floorboard, thus ensuring better ventilation and avoiding waterlogging. This increases the lifespan of the terrace and reduces the risk of the screws tearing off. With a combination of a flat aluminum substructure and wooden floorboards, we strongly recommend using the spacer profile. With a concealed construction with clips, better ventilation is already guaranteed by the system. A distance profile is not necessary.

Screw the substructure to the floor

The substructure can be screwed to the subfloor. This is not necessary in every case, since the weight and the crosswise screwing of the planks and substructure make the terrace very stable after completion. Many terraces are therefore laid as a floating system.

Lay the substructure in the bond

If the length of a single structural timber does not reach the full depth of the deck, structural timbers must be joined. Here it is advisable to avoid a continuous butt joint between the rows of construction wood and to lay the construction wood in an offset / bonded manner.

Substructure at board joints

If you lay your decking boards in a composite manner, we recommend that you use a
ends and a new plank begins, lay a double row of substructure. This way you don't have to screw the planks too close to the cut edge later.