BS EN 491:2004 specifies test methods for concrete roofing tiles and valley tiles, for assembly into pitched roof coverings.
It covers:
- definitions and symbols
- test methods
- hanging length and squareness of regular front edge tiles
- cover width
- flatness
- mass
- transverse strength
- impermeability
- freeze-thaw resistance and Nib support.
ISBN 0 580 45377 4