Winter Checklist: Getting Your Glazing Ready for the Cold

Twenty minutes on a dry autumn afternoon saves most of the winter glazing callouts we see. Here is the walkround, in order.

Outside first

• Drainage slots: poke them clear with a plastic strip — trapped water is the number one unit killer
• Sealant lines: look for cracked or lifting mastic around frames; water tracking behind a frame shows up as internal damp in January
• Gaskets: press them home where they have crept out of the channel; replace any that have gone hard and shiny

Then inside

• Hinges and locks: a drop of silicone-safe lubricant; espagnolette locks that need a shoulder to close are misaligned, and winter contraction makes it worse
• Compression check: shut a strip of paper in the sash — if it pulls out freely, the seal is not compressing and cold air is following the same path
• Trickle vents: open, clean, and left open — they remove the moisture that would otherwise fog the glass

Watch the glass itself

First frosts reveal unit health: external condensation that clears mid-morning is a good sign (the outer pane is cold because heat is staying in). Mist between the panes is the one to act on — the seal has gone, and cold weather accelerates the decline.

If the walkround turns up a failed unit or two, measure with the measuring guide and get trade pricing in minutes from the quote calculator — winter lead times are shortest early in the season.