The shape of the side keel is

1 l type: the side keel is fixed above the main keel and the auxiliary keel, and fixed with expansion screws, preferably reinforced with rivets. Rivets not only firmly connect the keels together, reducing the potential gap problem, but also can be disassembled more conveniently when necessary.

2.W-shaped side keel: it is a special form of side keel, which is W-shaped. The W-shaped side keel fixes the wallboard more tightly in the building, providing better support and stability.