Cost effective and comes with a few benefits such as: natural material which won't taint water, and it has good insulating effects in winter. There was a Dirty

Cost effective and comes with a few benefits such as: natural material which won't taint water, and it has good insulating effects in winter. There was a Dirty Jobs episode which featured Mike accompanying a water tank crew doing a roof top replacement. They shape the boards of wood at the shop, truck it in, and use manual labor to schlep the boards up to the roof. Old boards come back down the same way. No extremely expensive crane service or metal working necessary. So it is quite cost effective.