uPVC Sliding Window systems consist of two main joinery types. One of these is the sliding systems due to their ease of use and the advantage of space they provide. The biggest advantage of the sliding systems is that they don’t cause space loss as their sash is opened by sliding and settled on the other sash. Besides, ease of use and aesthetic appearance are the biggest pros of sliding systems. Insulation in the sliding systems is achieved through brush systems named weather stripping and thus, insulation is lower than in normal window systems. However, BMB winhouse has reduced insulation weakness to minimum levels through its special interlock systems used in the series of 70 mm and 75 mm.