Wind Resistance for External Blinds
External shading systems such as blinds can reduce heat gain almost to zero, and can result in savings of 65% on air conditioning costs. They remove the internal clutter of boxes or rollers around windows, and can even provide insulation in winter.
However, for external systems to perform well, they must withstand precipitation, extreme temperatures and, most crucially, strong winds.
In recent years, there has been a confusion of sales messages about wind resistance and increasingly bold statements about wind speeds and product thresholds. As a result, at European level, a number of interrelated and complex standards have been introduced or updated to regulate this area.
The wind is a powerful force. Even modern wind turbines are designed to be switched off at 100 km/h. In fact, during high winds, wind farms are evacuated and nearby footpaths and roads are closed.
It is for good reasons therefore that external shading systems are regulated by European Norms under the Construction Products Regulations (CPR), with mandatory CE marking introduced in June 2013.
Whilst it is crucial for architects and design teams to have an awareness of the key points when specifying shading solutions, the plethora of interrelated standards that regulate shading systems does not make for light bedtime reading.
In Europe, product manufacturers must:
- CE mark external blinds to these classifications, or specify that they are not classified.
- Define a windspeed over which blinds must be retracted.
- Verify that non-retractable parts of their products can withstand 800 N/m2 without deformation.
By --Guthrie Douglas Group Limited
[edit] Find out more
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
RTPI leader to become new CIOB Chief Executive Officer
Dr Victoria Hills MRTPI, FICE to take over after Caroline Gumble’s departure.
Social and affordable housing, a long term plan for delivery
The “Delivering a Decade of Renewal for Social and Affordable Housing” strategy sets out future path.
A change to adoptive architecture
Effects of global weather warming on architectural detailing, material choice and human interaction.
The proposed publicly owned and backed subsidiary of Homes England, to facilitate new homes.
How big is the problem and what can we do to mitigate the effects?
Overheating guidance and tools for building designers
A number of cool guides to help with the heat.
The UK's Modern Industrial Strategy: A 10 year plan
Previous consultation criticism, current key elements and general support with some persisting reservations.
Building Safety Regulator reforms
New roles, new staff and a new fast track service pave the way for a single construction regulator.
Architectural Technologist CPDs and Communications
CIAT CPD… and how you can do it!
Cooling centres and cool spaces
Managing extreme heat in cities by directing the public to places for heat stress relief and water sources.
Winter gardens: A brief history and warm variations
Extending the season with glass in different forms and terms.
Restoring Great Yarmouth's Winter Gardens
Transforming one of the least sustainable constructions imaginable.
Construction Skills Mission Board launch sector drive
Newly formed government and industry collaboration set strategy for recruiting an additional 100,000 construction workers a year.
New Architects Code comes into effect in September 2025
ARB Architects Code of Conduct and Practice available with ongoing consultation regarding guidance.
Welsh Skills Body (Medr) launches ambitious plan
The new skills body brings together funding and regulation of tertiary education and research for the devolved nation.
Paul Gandy FCIOB announced as next CIOB President
Former Tilbury Douglas CEO takes helm.
UK Infrastructure: A 10 Year Strategy. In brief with reactions
With the National Infrastructure and Service Transformation Authority (NISTA).