Application - Processing

Joints (arrangement and shape)

In principle, the arrangement of many joints (smaller board sizes) leads to lesser movement in the joints, and the arrangement of fewer joints (larger board sizes) leads to more movement in the joints, since AMROC-PANELS, like any other wood-based material, exhibit a swelling-shrinking behavior due to changes in moisture content. These movements must be compensated for in the fixing of the joints. Over time, the boards tend to shrink, something that has to be especially taken into account when making closed joints in order to avoid cracking in the jointing material. For special applications the manufacturer can provide boards with a lower moisture content. AMROC-PANELS are delivered ex-factory with a moisture content of 9% ± 3 (in building material class A2 11% ± 3), per the General Manufacturing Permits for construction.

Before use, the panels should be stored in such a way that no moisture can penetrate from the outside, which would lead to exceeding the aforementioned values.

The width of a closed, visible expansion joint (with rectangular edges) should be 10 mm to be able to accept enough durable elastic filling material for the compensation of panel movements. It is important to make sure that the filling material does not adhere to the underlying structure, but only with the panel edges, so that the elasticity of the filling material is not compromised. A frequently applied practical solution for accepting jointing materials are bevel edges, of which 50% to 70% (depen-ding on panel thickness) is bevelled off. At the blunt back part, a joint of 5 mm width is sufficient.

A construction with bevel edges for an open visible joint can also work out very well from an aesthetic point of view. The solution which is technically the simplest and the safest (where the total visual impression of a façade allows it) is the open, visible expansion joint. Covering of the surface of the underlying structure should be paid attention to. A joint of 5 mm width is technically sufficient, however, for reasons of assembly a joint of 10 mm is recommended. For aesthetic reasons, however, a larger joint may be required, in which case e. g. profiles or battens can be applied.

For the sealing of expansion joints, durable elastic alkali resistant filling materials must be applied.

Applications in dry rooms

One-component acrylic dispersion materials with a permitted total distortion of 20% are suitable.

External applications at façades and in moist rooms

One-component silicone or polyurethane materials with a permitted total distortion of 25% are suitable.

Filler Material

For all applications, always follow the guidelines of the manufacturer..