
Draught-proofing (sash windows) involves sealing the moving sash gaps to stop cold air from entering while enhancing heat retention and home comfort. The process requires brush or nylon pile seals to be installed in the parting bead and staff bead and meeting rail positions.
The process also needs weight and cord adjustments for correct balance. The correct installation of draught-proofing systems reduces air leakage by 80% and decreases both rattling and noise levels.
A basic step exists before window glazing upgrades which Historic England recommends for reversible low-impact protection of period properties.


