Fiber mesh — also searched as fiber jali or fiberglass mesh — is used to reinforce brick-to-concrete joints and plaster before rendering. Brick/block masonry and RCC columns or beams are different materials that expand and contract at different rates, and that mismatch is exactly what causes the hairline cracks so common along these joints — made worse by seasonal temperature swings, material shrinkage, and Pakistan's hot, humid climate. Builders prevent this by fixing a layer of fiber mesh (or wire mesh) across the joint before plastering. This fiber mesh for plaster and plastering work ships with delivery all over Pakistan.