The glass in aged windows might be the really early 'plate' or 'wide' glass to 'crown' or 'cylinder'.[five] Aged glass is recognised by its imperfections ('ream') which bring about optical distortion. Inspect your windows: Before starting the draught-proofing approach, totally inspect your timber sash windows for any existing gaps, cracks, https://3dfaceroller43197.blog2freedom.com/35851507/what-does-sash-windows-mean