Damaged or failed roof-window glazing can seriously affect the comfort and appearance of a room. Depending upon the condition and age of the window, replacement glazing may provide an alternative to replacing the complete unit.
Roof Window Glazing Problems
Contact us if you've noticed:
- Cracked glass
- Damaged glazing
- Misting between panes
- Failed sealed units
- Excessive draughts
- Deteriorating glazing performance
We'll assess the window and determine whether replacing the glazing or replacing the complete roof window represents the better solution.
Technical Specifications
What the Spec Sheet Says
VELUX glazing units are built up in layers, and which layers are damaged usually determines whether the glass alone can be replaced or the whole window needs to change.
- Double-glazed units use a laminated inner pane with a toughened outer pane; triple-glazed units add a heat-strengthened middle pane between the two.
- U-values differ by glazing pack, from around 1.3 W/m²K on standard double glazing down to about 0.83 W/m²K on the highest-spec triple glazing — worth factoring in if you're replacing glass anyway.
- A misted or 'blown' unit means the seal between panes has failed, which normally means replacing the sealed glazing unit rather than the surrounding frame.
- Laminated inner panes also improve acoustic and security performance, which is worth considering if noise or safety glazing is a concern alongside the repair.
Figures are typical for the VELUX ranges we install and vary by exact model — we'll confirm the specification that suits your roof at survey.
