AWSCO is now offering Window & Door "Envelope" surrounds that include Flat Casing, Header, Pediments with possible Keyblock and Sill. AWSCO has the exclusive installation system for the Envelopes to be able to be installed directly over existing sidings without cutting the siding by use of "Siding-Fillets!" Seven different envelope designs are available to enhance any window or door. Request Quote & Orders