• Normal carpet wear, sliding around heavy furniture, playing with a pet or exceptionally high foot traffic can cause a carpet to bunch in some places or ripple. Installation or manufacturing mistakes can also result in these flaws. Carpet is made of four layers.The first layer is the yarn that you walk on. The second layer is the primary backing. The third layer is a secondary backing, and each layer is held together by a latex adhesive. Since the adhesive generally contains a type of clay made out of marble dust, it absorbs moisture and expands. When this happens, the expansion will cause a buckle. Applying new carpet in the winter can also increase the risk of ripples. When it is cold, the carpet backing is stiff and difficult to stretch. When the warm summer months approach, the backing will relax, and then bubbles will appear in the carpet. While the problem seems minor, if it is not addressed it can cause more extensive rippling and eventually need replacement.