The Advanced Group - http://www.theadvancedgroup.co.uk Founded in 1989 by Mark Watson, the Advanced Group has grown in size and reputation to become Scotland’s largest and leading manufacturer, retailer and installer of uPVC products. Triple Glazing. Why fit double glazing when you can invest in Naturally Grained uPVC Triple Glazed Windows at no extra cost? In an increasingly energy conscious world, where the cost of heating our homes is rising every year, the pressure is on to improve the energy performance of our windows and conservatories. In fact, we are now reaching the stage where double-glazing is no longer enough. Advanced specialise in the supply of energy efficient Naturally Grained Triple Glazed uPVC Windows. Our unique design consists of 3 insulating layers of glass with two air spaces totaling 40mm. The air gaps provide the insulating layers that slow down the heat loss and reduce the opportunity for condensation to form.