Ask the Expert: What’s the Best Way to Fix Insulation Above a Pitched Roof?
By Niall Crosson
Thursday 24th April 2025
Warm pitched roofs, where some or all of the insulation is applied over the rafters, are increasingly common due to stricter thermal requirements and other benefits. These include better thermal continuity, improved acoustic performance, reduced condensation risk, safer installation, and increased living space within the roof. However, careful installation is essential to prevent over-compression, ensure long-lasting fixings, and avoid future movement or failure of the insulation and roof structure.
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Blog author
Niall Crosson
Technical Director (BTech, MEngSc, MIEI, CEPHC)
Niall is the Technical Director for Ecological Building Systems and was also the company’s first employee. Niall holds a first class honours degree as a Bachelor of Technology and a Masters in Eng.Sc. Niall is a certified Passivhaus Consultant and has provided technical guidance on many award winning low energy projects in Ireland and the UK, and has authored or co-authored several chapters in both the Passivhaus Handbook and the Passivhaus Designers Manual. Niall is also on the board of directors of the Irish Green Building Council and provides guidance on several national standards committees. Along with this, Niall has contributed to several construction publications including The Journal of the RIAI.
