ᐅ How to Install Insulation in an Existing Gable Roof

Hello

We have an old pitched roof without insulation. The space up there is intended only for tenant storage. The top floor ceiling, meaning the floor of the attic, will of course be insulated as required.
My question is: Should I just leave it as it is; should I install a boarding between the rafters; or maybe just tack in an underlay membrane?

I would prefer to avoid strong drafts up there.

Does anyone have helpful tips?

As a landlord, you should be more concerned than just having an underlay membrane to prevent drafts. Most of the energy is lost through the roof, so it needs to be done thoroughly and correctly. Even if the ceiling of the top floor is already insulated. Anything less I don’t consider future-proof, especially regarding energy consumption requirements. Right now, on your attic floor, the outside temperature equals the inside temperature. Especially in older buildings, I would use every possible measure to retain as much heat as possible INSIDE the building.

The question is what the tenants want to store. Due to the large temperature fluctuations, only durable items can be stored. If a wood fiberboard is used, I prefer that over plastic sheeting.