Roofing insulation is installed on the slope of the roof, above and below the timbers, while attic insulation is installed in the ceiling panel.
The UK Department of Energy recommends a minimum of 11 inches of rock wool, fibreglass, or cellulose insulation.
The lifespan of roof insulation ranges from 15 to 20 years, depending on factors such as the quality of installation and the material used.
Air gaps are essential to a roof's design because they create a barrier between the roof deck and the insulation layer, allowing air to circulate and preventing moisture buildup.