National annexes

Czech Republic

Following rules are used for the determination of the snow load according to CSN EN 1991-1-3/NA:

The map and list of snow regions is used according to the amendment Z1 CSN EN 1991-1-3:2005.
The load figure according to the figure NA.1 is used for cylindrical roofs with h/b> 1/8 or with snowguards and in snow regions IV and V.

Following rules are used for the determination of the wind load according to CSN EN 1991-1-4/NA:

The map and list of wind regions is used according to the CSN EN 1991-1-4:2007.

Following rules are used for the determination of the snow load according to STN EN 1991-1-3/NA:

Tha values of s_k are calculated according to the chapter NA.2.8 of STN EN 1991-1-3/NA1:2012.
The map and list of snow regions is used according to the Annex C of STN EN 1991-1-3/NA1:2012.
The map and list of regions with accidental load is used according to the Annex C of STN EN 1991-1-3/NA1:2012.

Following rules are used for the determination of the wind load according to STN EN 1991-1-4/NA:

The map and list of wind regions is used according to the STN EN 1991-1-4:2008.
Pressure coefficients c_pe for flat roofs are selected according to the table 7.2/NA.
Pressure coefficients c_pe for mono-pitched roofs are selected according to the table 7.3/NA.
Pressure coefficients c_pe for duo-pitched roofs are selected according to the table 7.4/NA.
Pressure coefficients c_pe for hip roofs are selected according to the table 7.5/NA.

Following rules are used for the determination of the snow load according to PN EN 1991-1-3/NA:

The map and list of snow regions is used according to the NB1.7 of PN EN 1991-1-3:2005.

Following rules are used for the determination of the wind load according to PN EN 1991-1-4/NA:

The map and list of wind regions is used according to the PN EN 1991-1-4:2008.