First, cut the roofing material with even rectangular pieces and bend it into the tray. After that, hold the roofing material above the bonfire, the resin will begin to melt and drain down the tray down, put iron dishes above the tray, hold the sheet until it turns into ordinary black paper. Now coat the column with this resin, and dig it. During dug up, do not forget to trample the earth with a tamping. If you did everything right, then your building will last you for a long time.