NI WW 35 - Window Wall 35 Insulation is a lightweight, semi-rigid stone wool insulation board designed specifically for use in window and wall systems and is best suited for use with backpans or mechanical fastened applications. NI WW 35 Insulation meets building fire codes for flame and smoke development and fire resistance and will not develop toxic smoke, even when exposed directly to a fire. NI WW 35 insulation has excellent acoustic properties. Because the products are dimensionally and chemically stable, they maintain thermal performance over their lifetime. This contributes to the optimal performance of a building envelope.

NI WW 35 Insulation is an inorganic mineral fiber insulation material that is produced from basalt volcanic rock. It is non-combustible, nondeteriorating, moisture resistant, dimensionally stable, noncorrosive, and non-mildew supporting. It has a high fiber with a low non-fibrous content and a very low organic binder. It maintains a consistent density throughout it’s designed life cycle.

NI WW 35 Insulation is easy to install. It is easily cut and formed with a knife and will not break or crack if dropped. It is also compressible and resilient, allowing it to be squeezed into tight spaces as required.

NI WW 35 Insulation is packaged in a poly film shrink wrap.

NI WW 35 Insulation can be used in fire-rated wall assemblies although the exact assembly may require further testing to comply with building codes. The use of such a wall does not preclude the need for active fire suppression or detection systems. A sheet or film vapor retarder, adhered to one face of the boards, may be needed for particular exterior wall applications, and should be specified by the architect or engineer for the building project. For acoustical applications requiring a particular STC rating, further testing of the exact wall assembly may be required since product thickness and dry wall thickness stud spacing and affect test results.