Headlap Tables for Natural Slate BS 5534 | SIGA : SIGA
The Minimum Roof Pitch for Natural Slates is 20 degrees (BS 5534:2014 Page 45), depending on Size of Slate See Table Above (BS 5534:2014 Page 45, Table 9). Slates 450mm Long or Less Should Not Be Used at Pitches Of 27.5 Degrees or Less (Moderate & Severe Exposure) (BS 5534:2014 Page 45). Slates less than or equal to 460mm long or greater than ...