Areas on flat roof and selection of amount of screws

Rule of setting areas on flat roofs defines standard PN-EN 1991-1-4:2008 standard "Eurocode 1.

Impacts on structures, Part 1-4: general impact. Wind impact".

The drawing below shows the ways of determining:

- angular zone (sign as F);
- margin, outside zone (sign as G);
- margin, inside zone (sign as H);
- inside zone (sign as I).

Smaller dimension of the two e = b or 2h

wind

Dimension transverse to the direction of the wind

Rule of setting areas on flat roofs defines standard PN-EN 1991-1-4:2008.

Scheme of screws’ montage determines the rule below:

- angular zone - 9 pcs. / 1m²,
- margin, outside zone - 6 pcs. / 1m²,
- margin, inside zone - 3 - 6 pcs. / 1m²,
- inside zone - 3 pcs. / 1m².

Roof division into zones:

A - angular zone, B - margin, outside zone,

C - margin, inside zone, D - inside zone