Brush strips are the best way to insulate a sliding glass door. The brush strip allows for the gap between the frameless glass door and the walls or fixed panel to be closed in a neat and elegant way. This reduces the draught that can get under a door and cause the room to lose heat, it can also act as a sound-dampener and a spider excluder. Doorstuff have a range of seals and brush strips for various doors. So if you need to insulate your frameless glass door, why not check out the Dorma brush strip on our website!