These casement windows in Amersham had leaded single glazing. Unfortunately, damage to the putty had allowed rain into the bottom rails and rotten the sashes.
Whilst repair was still possible, the customer took the opportunity to upgrade to double glazed units. To achieve this, we opted for new sashes with slightly beefed up joinery to handle the additional weight.
Although it’s often possible to retrofit double glazing into an existing sash, the results are usually short-lived as the extra weight and shallow rebates are less than ideal for both the joinery and the double glazed unit itself. In fact, we often see the sashes and/or glazing fail within 10 years.
To incorporate the stronger sashes and their double glazing, we double rebated each sash to fit snugly into each original frame. This retains the flush appearance of the original design whilst also gaining some additional weather protection, useful in this relatively exposed position on the building.
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