The Mk 2 Unit has no equal. years of research and development has created this double-sided finished GRP base unit.
Moulded in one piece without seams or joints, it allows you to fit a base unit and window board including sill, all at the same time. Your window frame simply sits on top.
Frames can be either face-drained or concealed-drained by packing the back edge of the frame with a bead as in Fig. 1. Allows you to create a beautifully finished internal and external sill in one step.