how to build a pvc shower chair | hunker the preferred material for a shower chair is polyvinyl chloride or pvc. step 1. cut two pieces of woven mesh measuring 28 by 28 inches. cut a 3-by-3-inch square out of each corner of both pieces of fabric. wrap all four sides of both squares around a 2-by-22-inch pvc pipe. overlap the fabric 1 inch and secure it with straight pins.