Installation practice with top-floor ceiling insulation

Insulation above the top-floor ceiling can be made either walk-on or non-walk-on. As a rule the ceiling must be subjected to structural analysis.

Especially with timber beam ceilings, an airtight level must be implemented beneath the insulation layer. The reason for this is to avoid air flow from the interior through the ceiling, so as to minimize the risk of condensation in the structure, which could lead to the beams rotting.

Note that thermal bridges can arise when a top-floor ceiling is insulated:

at eave junctions
at partition walls
at staircases
at penetrations, e.g. chimneys.