Here at The Real Shed Company we offer a variety of different options and this also includes our windows. The profile of timber that we use allows us to incorporate double glazed units into our buildings. As standard all our buildings include 4mm toughened glass. We are also able to offer 14mm double glazed units as an optional upgrade. The double glazed units are constructed from 2 x 4mm piece of toughened glass with a 6mm spaces in between. The cavity in the 6mm spacer is filled with argon which creates a insulated glass unit. All our glass is sealed with clear silicone and beaded into position which helps keep your building warm from any drafts. We also fit a rubber seal to the bottom bead of the windows to help water ingress.