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External access point covers
3.14NI-wide·Technical Booklet N Drainage
Every external access point should have a removable non-ventilating cover of durable material and suitable strength.
drainageexternal-spaceGutter layout and sizing
4.4NI-wide·Technical Booklet N Drainage
A gutter should be laid with a slight fall towards the outlet. Where the outlet is not at the end, the gutter should be sized for the larger of the areas draining into it. The gutter should be laid or
drainageexternal-spaceTable 4.3 - Gutter and outlet sizes for true half round eaves gutters
Table 4.3NI-wide·Technical Booklet N Drainage
Max effective roof area (m2): –, 6.0, 18.0, 37.0, 53.0, 65.0, 103.0 Gutter size (mm diameter): 75, 100, 115, 125, 150 Outlet size (mm diameter): –, 50, 63, 63, 75, 89 Flow capacity (litres/sec): –, 0.
drainageexternal-space