I don't often share secrets but for this web site I will.Always a hassle deciding what to use to cover those split stacks and keep the moisture from penetrating within.A product called Rhino Roof,roofing underlayment moisture barrier. The stuff is 7 mils,light as a feather and easy to work with,staples easily to wood stacks ,repels water beautifully and the piles innards remain dry.Not that expensive check various roofing supply companies for best pricing roll is 42 wide and about 200 feet long or thereabouts.I stumbled upon this by accident,beats tarps,black plastic etc. Very easy to work with. Very tear resistant,trust me ,I know what I'm talking about.Will not mold,mice don't like it.