Web based tool for OEM, engineers and roofing contractors

The new Eurocode 1991-1-4 with different National Annexes (NA), for each European country, makes it very difficult to perform correct wind load calculations for each project.

Long experience of wind load calculations for the flat roofing industry have made us aware of the importance of accurate wind load calculations along with clear installation instructions for the roofers at site.

Our ambition with Roof Calculator has been to develop an accurate and user friendly tool designed for the entire European market.


NA’s for 30 countries already included

Austria - ÖNORM EN 1991-1-4/NA:2009
Belgium - NBN EN 1991-1-4/NA:2010
Bulgaria - BDS EN 1991-1-4/NA:2011
Cyprus - CYS EN 1991-1-4/NA:2010 
Czech Republic - CSN EN 1991-1-4/NA:2007 
Denmark - DS EN 1991-1-4/NA:2007 
Estonia - EVS EN 1991-1-4/NA:2010
Finland - SFS EN 1991-1-4/NA:2007 
France - NF EN 1991-1-4/NA:2011 
Germany - DIN EN 1991-1-4/NA:2010 
Greece - ELOT EN 1991-1-4/NA:2009 
Hungary - MSZ EN 1991-1-4/NA:2007
Iceland - IST EN 1991-1-4/NA:2010 
Ireland - IS EN 1991-1-4/NA:2010
Italy - UNI EN 1991-1-4/NA:2010
Latvia - LVS EN 1991-1-4/NA:2011
Lithuania - LST EN 1991-1-4/NA:2012
Netherlands - NEN EN 1991-1-4/NA:2007 
Norway - NS EN 1991-1-4/NA:2009 
Poland - PN EN 1991-1-4/NA:2010 
Portugal - NP EN 1991-1-4/NA:2010
Romania - SR EN 1991-1-4/NA:2007 
Russia – EN 1191-1-4/NA
Serbia – SRPS EN 1191-1-4:2012
Slovakia - STN EN 1991-1-4/NA:2007
Slovenia - SIST EN 1991-1-4/NA:2008
Spain - UNE EN 1991-1-4
Switzerland – SIA 261:2014
Sweden - SS EN 1991-1-4/NA:2010
United Kingdom - BS EN 1991-1-4/NA:2008

If you lack a country please get in touch and we will see what we can do. Our amition is to add more countries gradually.


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Our ambition is to support our customers to get started quick and easy. We assist you to build your database of your roofing system including other components such as preferred fixings and insulation types.

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Presentation of the software

Download our product presentation and read all about the different features which RoofCalculator provides.