Patent ID: 6119424
Filing Date: 2000-09-19
Classification: E04B

Abstract:
A method of providing insulation between sets of parallel joists (31, 32, 51, 52) having a center line spaced X mm apart and being Y mm high, where X is about 400 or about 600 and Y is in the range of 75 to 100, comprising providing a roll (30) of mineral fibre wool which, when unwound and relaxed, forms an elongated batt with rectangular cross-section having width in the range X to X+40 mm and a thickness of at least Y+50 mm, and which along each longitudinal edge comprises top layer (35, 55) and a bottom layer (33, 53) defined by a split (40, 60) which extends between the top and bottom layers from the said edge to at least 15 mm in board of the edge, the bottom layer being in the range Y.+-.25 mm thick and the top layer being at least 25 mm thick and the top and bottom layers having the same width which is in the range X to X+40 mm and having the same density unwinding the roll such that the batt lies parallel to the joist centered generally along the line midway between a pair of joists, and with the said bottom layer facing the joists, andcompressing the bottom layer inwards toward the centerline to fit the bottom layer between the joists whilst the top layer is not compressed and lies on top of each of the pair of joists such that the top layers of adjacent batts abut each other generally level with the joist centrelines.