I. Provisional fixing:

After the bending Bendywood®-handrails should only be fixed provisionally to the banister, so that they can shrink along their length.

Handrails that are bent at a moisture content of 12% will shrink up to 0,5 cm per meter along their length until the moisture content is reduced to about 8%.

II. Final assembly:

Only after this the handrail can be taken off, sanded (if necessary), finished and permanently fixed.

Start with a fix mounting point halfway its length and mount the handrail from there towards the ends in such a way that it can still shrink a bit along its length, especially in the case of long handrails.

Please consider that a 6 m long handrail, for instance, will further shrink up to 1 cm (on its total length) within the first year after final assembly, especially when the place is well heated.

III. Mitre joints:

Mitre joints at the ends should be avoided: the risk that they will „open up“ in the long term is high.

Solution mitre joints

In case mitre joints cannot be avoided, there are 2 options:

  • Mitre joints with synthetic resin glue and a threaded rod:
    • Drill sufficiently big and profound holes into the handrail ends that need to be jointed;
    • Fill these drill holes at both ends with a synthetic resin glue and insert a threaded rod, which diameter should be a bit smaller than the one of the drill hole;
    • Press both handrail ends together with clamps and keep them in position until the glue has dried.

The use of a threaded rod as well as the use of synthetic resin glue are both absolutely necessary to prevent the joints from opening up.

Drawing sharp joint ENG     Mitre joints

  • "Open" mitre joints or "open" butt joints:
    Such joints are secure and in certain cases also decorative (when combined with glass elements, for instance).

Solution butt joint     Solution mitre joint

Only in the following cases this problem doesn’t occur:

  • In case the handrail is bolted down to a continuous metal rail (from below) at small intervals of about 10-20 cm;
  • In case the mitre joint is under tension: this occurs when bent parts (which always open up a little) exert pressure on the mitre joint.