3.2 – Roof details and joints – 4. Construction of valleys 238 Type Overlap Required pitch slope Pitch slope with secondary waterproofing (ref. chap. 2.1.8 and 2.1.11) Expansion Box-shaped valley with a depth ≥ 60 mm ≥ 100 mm ≥ 7° (12.3%) ≥ 3° (5.2%) very good Box-shaped valley with a depth ≥ 30 mm ≥ 100 mm ≥ 20° (36.4%) ≥ 20° (36.4%) good Valley with hooking strip and f ilament mat inserted in the overlap or folded with drainage function ≥ 240 mm ≥ 10° (17.6%) ≥ 7° (12.3%) good ≥ 170 mm ≥ 20° (36.4%) ≥ 20° (36.4%) good Valley with simple seaming 50 mm ≥ 30° (57.7%) ≥ 30° (57.7%) reduced Double joint transversal joint and waterproof ing with self-expanding tape 30 mm ≥ 7° (12.3%) ≥ 3° (5.2%) not possible If a transversal joint of the valleys is necessary, for greater lengths, this must be soldered for slopes between 3° and 10° and made with a transversal joint hooking strip for slopes greater than 10°. EXCERPT
RkJQdWJsaXNoZXIy ODUwMjE2