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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.

Slovakia

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.

Poland

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.

Austria

Following rules are used for the determination of the snow load according to ÖNORM B 1991-1-3:

• The map and list of snow regions is used according to the 8.1.2 of ÖNORM B 1991-1-3:2022. The map is accessible from hora.gv.at.
• Coefficient for exceptional snow loads C_esl is used according to chapter 8.3.
• Exposure coefficient C_e is used according to chapter 9.1.4.
• Thermal coefficient C_t is used according to chapter 9.1.5.
• Snow load shape coefficients μ₁, μ₂ are used according to chapter 9.2.1.2 Table 2.