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In most cases, we also use PU wood glue to mount our Tree Screws.

The basis of our thinking is tree biology and the wound reaction of trees:

  • The tree reacts to injuries by storing resins and essential oils. This seals the vessels and prevents the penetration of fungal spores and rot. In addition, these deposits are often inedible for insects.
  • The damaged vessels can be imagined as long tubes in which water and nutrients are transported. If the pipe is damaged, the hose will leak and no longer function.
  • The loss of the broken conduits is compensated for. Around the injured zone (e.g. bore of the screw) new vessels are formed in the following years.

Why does “TheTreehouse.Shop” recommend PU glue for fixing the screws?

  • PU glue expands up to three times its volume when cured
  • It fills all cavities
  • Like the tree with its resins and oils, the glue penetrates the damaged vessels and seals them permanently – so fungi and insects don’t stand a chance
  • While the tree itself can only store fungus-inhibiting substances in the active wood (the outer 1 – 5 cm of the trunk), the PU glue seals the borehole far into the interior and prevents fungus from spreading from the core to the outside.
  • The glue strengthens the wood immediately around it.
  • The tree screw sits bomb-proof in the hole – so you can loosen a tight nut later without having to unscrew the screw again.

Why not use natural resins instead of toxic PU glue?

Natural substances could theoretically provide a breeding ground for fungi and insects. In addition, their hardening and volume increase is not as good as with PU glue.

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