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Underlay

Underlay should have durability no less than the cladding material, and be compatible in contact with the roofing material.

Clause: 
004_019_004_000_000_000_000_000_000
Clause Number: 
4.19.4
4.19.4
/cop/durability/accessories#underlay
Draft Clause: 
004_019_004_000_000_000_000_000_000