Heavy weight Type B valley with the addition of floride based patented surface protection. Provides complete protection against UV light, resistant to virtually all chemicals,solvents and pollutants,temperature range -40 to 100. The durability of Diamond 60 has been recognised as matching code 7 lead by Housing Association Property Mutual (HAPM). Designed for very harsh environments or prestige building. ApplicationSuitable for use on roofs with pitches from 17.5 to 55.Can accommodate a maximum difference between two rafter pitches of 15.Designed for use with natural slate, manufactured slate and plain tiles.Fixes over the batten for fast and simple installation.PropertiesLength: 3m.Width: 360mm.Weight: 2.4kg per m2.Thickness: 1.6mm.Colour: grey / blue.Material: GRP - high quality unfilled polyester resin with glass fibre reinforcement.FeaturesBBA Approved Cert No. 89/2153.UV light and acid rain resistant.At least durable as lead.Less prone to theft.Design for harsh environments or prestige buildings.Smooth surface inhibits the growth of moss & lichen and build-up of debris.Fire resistance to SAB to BS476 part 3 and Class 3 BS476 part 7.