Like that natural, unpainted look for your shingles? You are not alone – in Marin County it is a common look. Nature is a good thing, but not when it comes to protecting your house. According to NBI, unpainted homes are at least 10 times more prone to beetle infestations. Beetles cannot infest in painted or varnished wood. Treating beetles can be very costly- so keep the critters away by maintaining your shingles and keeping them painted or varnished!