ABOUT SASH WINDOWS

Assembly Rails: This is where the highest and base sashes overlap. Even a one–2mm hole here can enable cold air to snake by way of, Primarily on windy nights.A lot less than 1 / 4 of the heat misplaced by way of a standard conventional window escapes by conduction with the glass. The rest is air leakage as draughts.Muntins are the narrow strips t