Wasp question

[Svea]

i have some old trellis on the side of my balcony, you know, the wooden type. aged to a silvery grey over the years, i have noticed 'scratch marks' everywhere which expose the wood colour underneath, i.e. the surface has been scratched off.
the other day while sitting on the balcony, i could hear a rasping sound, checkend and saw a wasp rasping off the surface.
now the question is: what on earth is the wasp going to use that for? why would they do that?

answers on a postcard please to the usual address.

thank you. :D

[Svea]

[Bambi.1]

l thought that's what they made their nests out of  ??? they make it into a pulp don't they  ???

[redimp]

Nest builiding/maintenance.  They chew up wood to make the paper they make their nests out of.

[Svea]

aha, that clarifies things. i just hope their building site is some way away :o as i dont fancy living in the immediate neighbourhood of a nest of wasps!

[dotCompost]

...when you were a kid, didn't you think yourself very grownup when you used to chew a matchstick  :D :D :D