Storage and insulation need to be planned together. Compressing insulation or blocking ventilation is not a good way to make space. Ask for an appropriate boarding and access arrangement that accommodates the insulation and allows checks of the roof space. A loft intended as a habitable room is a different project from insulating the floor of a cold storage loft.
Join the discussion: Is your priority a small access path, occasional storage or a usable room?
Suggested next step: Ask the surveyor to include storage and safe access in the insulation design.
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