The ENCAP™ system has been designed by our company to offer the most advanced draught proofing system for timber double hung sliding sash windows. It is totally concealed within the sash frame and as such is ideally suited for use on listed buildings or other properties where the original design details and character are to be retained. In many instances this offers a cost effective alternative to replacement windows.

The ENCAP™ system uses special open cell structure urethane foam encapsulated in a polypropylene sheath which has many advantages over traditional brush or pile seals. In this application, its ability to remain flexible even after over painting with gloss paint is one of its more important features as other seals tend to harden and become ineffectual under these conditions. The ability to return to its original shape after compression and low coefficient to friction make it the ideal seal for this application.