Niall Crosson

Niall is Senior Engineer with Ecological Building Systems. He holds a degree as a Bachelor of Technology (1st class Hons.) and a Masters Eng. Sc. He is also a Certified Passivhaus Consultant and board member of Irish Green Building Council. provides guidance on several national standard committees.

His expertise is in the area of building physics, energy conservation, hygrothermal analysis, airtightness, natural insulation, and vapour diffusion open constructions. Niall has provided guidance to many award winning low energy projects in Ireland and the UK. He has also co-authored and authored chapters for a number of low energy building publications including The Passivhaus Handbook and The Passivhaus Designers Manual. Niall also provides regular technical contributions to numerous construction publications including The Journal of the Royal Institute of Architects of Ireland.

“Airtightness is an essential part of creating a healthy, comfortable, energy-efficient living environment. Air leakage is one of the most significant contributors to inefficiently heated buildings. Research confirms that air leakage can account for up to half of all heat losses in modern buildings and reduce insulation performance by as much as 480%. It is no surprise that airtightness is now highlighted as one of the most effective means of reducing heat loss and improving energy efficiency.

Increased Airtightness can have unintended consequences if it is not combined with a robust ventilation strategy to ensure adequate fresh clean air is delivered to the occupants. It is important that once we “Build Tight” that we “Ventilate Right”.

The materials we use (such as vapour barriers) to attain improved airtightness may also have a deleterious effect on the building envelope and inadvertently lead to increased risk of mould and structural degradation over the long term.”

Niall will outline key considerations to ensure a healthy living climate within buildings and also key steps to optimising the safety of the building envelope against mould growth and condensation risk.


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