Has WhatMightHaveBeen has kindly clarified, having a reasonably sized outer wall is more than enough to prevent claim intersection areas from reaching our inner claim. The claim overlap only happens when others build right outside of your claim and only affects the area where both claims are present, it does not allow other players to progressively interfere with your claim.
To be absolutely clear, we do not encourage any form of claim spam, and may even act upon it if we determine it to be excessive.