D-Lux Pro Sound is a sound control underlayment and crack isolation membrane. Its 130 mil internally reinforced Peel and Stick membrane was designed for thin set installations of ceramic, porcelain and natural stone tiles. This membrane underlayment reduces moisture vapor emissions and helps minimize mold and mildew growth. Due to the very high natural/SBS rubber content and its exclusive non-woven poly propylene fabric construction, alkalinity in mortars are prevented from breaking down the system. This combination of materials also adds strength to withstand horizontal structural movement and concrete shrinkage cracks (up to 3/8"), preventing the transfer of stress load to the tile which could otherwise lead to cracked and broken tiles.