What are the best solutions when tackling the insulation of a boarded roof? Various types of buildings have boarded roofs. Buildings with boarded roofs range from churches, church halls, schools, big Victorian houses and pubs to agricultural barns and garden sheds. The insulation strategy may be different according to the particular situation.

I have a 1930’s close boarded roof, the previous owner insulated the roof space with polystyrene chips! (Total Fire nightmare and also difficult to remove). What would be the best way to insulate? I’ve looked at fitting 50mm celotex to the underside of the rafters with a 50mm air gap then covering with a membrane, in theory making a warm roof.

Proper roof insulation is essential for reducing energy consumption, improving comfort, and protecting the building from moisture damage. Without adequate insulation, heat can escape through the roof, causing higher energy bills and placing extra strain on your heating system.

Fasteners and plates too close the edges of insulation boards or too far into the boards from the edge of the boards, as compared to the roof manufacturer’s requirements. Fasteners that are bent or driven at an angle to the roof surface. Fasteners must be driven in perpendicular to the roof surface.

If a roof assembly is designed to achieve a thermal performance of R-30, HD polyiso cover board can add R-2.5 to that value, thus reducing the additional insulation required in the assembly. Conversely, if gypsum is specified, the roof assembly will need more insulation beneath the cover board to meet the desired thermal performance.