This disclosure provides a cement board bay comprising a skid, the cement boards and a cover to protect the boards from whether. The cover is of breathable water proof material and it has a skirt that elastically or otherwise tightens the cover over the boards. The cover is secured with closing devices. The upper surface of the cover may include ridges, convex portions or water absorbent areas to prevent water from standing on the bay. The cover sides may include flap openings for removing tapes holding the boards on place without removing the bay cover.