The diffusion-open wood fibre board type MDF. RWH AGEPAN® DWD protect N+F / AGEPAN DWD® 600 is used as a sarking board for fully insulated rafter roofs. It serves as a second water-draining layer and can be used as a statically stiffening element of roof panels according to the general building authority approval Z-9.1-382. As a sarking board according to ZVDH regulations: UDP-A, in accordance with EN 14967: Type IL, it also serves as an emergency roof function for up to 8 weeks during free weathering and after storm damage. The protection against hail and the resistance to penetration by small rodents have been officially tested.