Have you noticed how so many southern porches have blue porch ceilings?  It adds some color interest.  I learned that this color discourages wasps from building nests on the porch ceiling.  It seems to work.  We have never had a wasp nest on our porches.

The only place where we did nave a wasp nest was on a palm leaf underside several years ago, when it was like a  palm shrub, and this problem was easily solved, though I do not recall how.