Guidelines for Good Curtain Wall Design

Aluminium curtain wall systems are a popular choice for a variety of projects due to their aesthetic appeal, energy efficiency, and design flexibility. However, even experienced designers, specifiers and architects can experience challenges when designing these types of fa?ades, leading to performance issues, costly repairs, or even structural damage. The Kawneer Technical Team are on hand throughout the process to help and advise the specifier to ensure that the curtain wall you specify is the right curtain wall for the right application.?

In this article, we'll discuss areas to consider when designing aluminium curtain wall systems and offer guidance on how to avoid drawbacks to create a successful project.?

Maximising Thermal Performance:?

One of the primary benefits of aluminium curtain wall systems is their energy efficiency. Ensure a high level of thermal performance within the fa?ade with appropriate thermal break technology and specify insulated glass units, high-performance sealants to help minimise heat transfer. Consider the position of the building to optimise solar heat gain and correct glazing specification utilising Low-E and Solar control coatings.?

Overlooking Building Movement:?

Building movement, caused by factors such as thermal expansion, wind loads, live loads and seismic activity, can significantly impact curtain wall performance. Design the curtain wall system to accommodate building movement using expansion joints, slotted connections, or optimising glass aspect ratios. For example, the Kawneer building movement joint can accommodate +/-15mm of building movement in the capped system and +/-5mm movement in the SSG version (Structural Silicone Glazing).??

A future article in this series will explore this topic in more depth.?

Inadequate Drainage and Ventilation:?

Inadequate drainage and ventilation can lead to water infiltration and condensation, causing structural damage or mould growth. The Kawneer curtain wall systems are designed in accordance with CWCT Sequence B. Kawneer offers both zone drained and mullion drained curtain wall systems to ensure that most project requirements can be met.

Reputable system suppliers will have a range of specified accessories and ancillary items recommended for use. Bi-metallic corrosion is often a longer-term failure point – ensure all fixings and fasteners are suitably specified – Austenitic Stainless steel is specified for Kawneer Systems. It is important to note that even sealed SSG systems need an optimised method of ventilation to avoid interstitial condensation being trapped in the glazing cavities.???

Avoid Incompatible Materials:?

Using incompatible materials in the curtain wall assembly can result in accelerated corrosion or premature failure. Therefore, it is important to ensure that all materials within the system, including fasteners, sealants, and finishes, are compatible with the main aluminium substrate and suitable isolators should also be considered where different materials interface.???

Comply with Local Regulations and Guidelines:?

Failing to comply with local building codes, regulations, and guidelines can lead to project delays or costly revisions. To avoid this issue, familiarise yourself with the applicable requirements, such as energy performance, fire safety, and wind-load specifications, and design your curtain wall system accordingly.??

Maintenance Planning:?

Failing to plan for maintenance can result in a reduced curtain wall lifespan and increased repair costs. To avoid this mistake, design your curtain wall system with maintenance at the front of mind by ensuring components are easily accessible and replaceable. Additionally, establish a maintenance plan that includes periodic inspections and repairs as needed.?

Conclusion:?

Ensuring the correct design aluminium curtain wall systems can deliver outstanding performance, durability, and aesthetics. Giving appropriate close attention to thermal performance, building movement, drainage, and material compatibility will help create a resilient curtain wall system that features longevity. Complying with local regulations and implementing a maintenance plan will further enhance the success and performance of any aluminium curtain wall project.?

Contact our experienced team to learn more about Kawneer curtain wall systems: Use our web form (kawneer.co.uk) or send an email to [email protected]