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My builder laid the roof of the house without underlay screen. Is this regulation?

A under-roof screen is not mandatory except in certain geographical areas and configurations. It is nevertheless strongly recommended because it brings many advantages:
- protection against rising powder snow
- dust protection
- Protection of lumber with respect to moisture
- protection against possible water infitration
- protection of tiles in very windy regions
- protection of the insulation of the attic (risk of insulation displacement due to drafts)

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