Recently a client requested that we install 100mm Isotherm between the ceiling boards and roof sheeting.
In most homes the ceilings are placed below the roof trusses making installation quick and easy (No longer than a few hours). We would simply climb in the ceiling void and place the isotherm blankets between the trusses.
However, in this case the client had exposed trusses, with raked ceilings installed in between the truss top cords. The only way for us to install the isotherm was to remove all the roof sheeting, carefully place the 100mm isotherm on top of the ceiling boards, and then refit foil underlay and roof sheeting.