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There are no grooves or ‘v’ lines running along Altherm profiles, and we’ve paid close attention to shapes and proportions across all our ranges.

Roof Windows

These are the ideal choice for an overhead window where flexibility and thermal efficiency is required. Altherm roof windows minimise condensation, and help retain interior heat and comfort levels.

Our roof windows can be fixed or hinged on one side to allow opening for ventilation. The Altherm roof window has a thermal break in both the frame and sash – this ensures maximum thermal efficiency when the window is closed.

Offering the ultimate in flexibility and style, Altherm roof windows can be made in a wide range of sizes, customised to required dimensions. They are also available in dual colour - allowing a match with both interior and roof colours.