"Fredxx" wrote in message
...
On 02/11/2020 14:53:33, TimW wrote:
On 02/11/2020 03:26, wrote:
On Sunday, 1 November 2020 16:31:44 UTC, TimW wrote:

I am involved in a project to put some small wooden structures like
nesting boxes out in some woodland. The Desire is that they should be
100% (or at least 99%) biodegradable, so they last as long as poss but
ultimately rot away to nothing. Fixing them in trees with synthetic
ropes or straps is therefore obviously a complete no-no. So traditional
rope is required.

There's a bewildering array of different materials - coir, hemp, flax
etc and some treatments as well like tarred rope. Does anyone know what
is a good choice here for just lasting a few years out in the weather?
Is it better to have thicker rope for lasting, or just strong enough to
do the job?

TW

So you want a fixing that will drop the box to the ground every few
years. I could ask, but there won't be any sensible reason.

A screw would be more sensible.


No. I want a fixing which can be expected to outlast the wooden box, but
not last forever.

My experience is that after 20 years in the elements, even a galvanised
screw would have been pretty well wasted away.

Not my experience. My Oregon barge boards are bolted to
the steel behind them using galvanised gutter bolts and they
are all still as good as when they were first used, 50 years later.