Ideal for the new build market and known as YBS Cavi-Mate EPS, this window installation system can be used with any type of PVCu, aluminium or timber framed window and enables contractors to fit window frames by building around the subframe and then fitting the windows when all the other building work is completed. The windows can be fitted in place from either inside or outside, freeing the builder from the necessity of retaining scaffolding in place longer than absolutely necessary. <br> <br> Once the builder has decided on the required frame size and determined width of the cavity, the ready assembled Cavi-Mate EPS u-shape window formers can be inserted into place.<br> <br>