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We use patented Screwless Crimped Corner Connectors to keep the mitre joints tight and strong.
These same connectors have the double benefit of preventing water entering the joinery and providing controlled paths to drain away unwanted moisture.
Frames for awning & casement windows and hinged doors are designed to be crimped together in a counter directional way without penetrating the glazing platform. This draws the extrusion together to create tight joints, which with modern sealants significantly reduce the likelihood of leaks.
Sealant is then injected to seal off the frame protecting the liner. The corner connector used in this process also acts as frame support for the mitred joint. It provides controlled drainage paths for condensation, channels errant water at the head, and any water picked up through a joint failure, safely directing water to the outside of the building envelope.