Home Product News Rockwool boosts insulation performance for Clarin College flat roof

Priority Roofing has installed over 7,500m2 of ROCKWOOL HARDROCK® Multi-Fix Dual Density for the new secondary school development at Clarin College, Athenry. In supplying the non-combustible insulation solution, ROCKWOOL enabled the roofing contractor to deliver against a complex specification which required thermal and acoustic performance without compromising on fire safety.

For Clarin College’s 6,500m2 general building and 1,000m2 gymnasium, Healy Partners Architects specified a warm flat roof build up which would help achieve an indoor ambient noise level (IANL) of 35dB, as per the requirements of SDG 02-05-03 (Acoustic Performance in New Primary & Post Primary School Buildings).

It was also essential that the general performance requirements of TGD 021-7 (Minimum Performance Standards of Roof Materials and Finishes) were met, and the specification defined a target U-value of 0.16 W/m2K to exceed the thermal requirement for flat roofs in schools as per Technical Guidance Document L. Having attended ROCKWOOL CPD sessions on the role of insulation in schools, Healy Partners Architects also took the best practice approach of specifying non-combustible insulation across the entirety of the two flat roofs.

Using non-combustible insulation across the entire flat roof is an increasingly common trend among designers, and doing so helped Priority Roofing to reduce zoning concerns and simplify the installation process.

As a non-combustible insulation solution, ROCKWOOL HARDROCK® Multi-Fix Dual Density met the fire safety requirements while also delivering against the thermal and acoustic targets. Clarin College’s new flat roof achieved a U-value of 0.15 W/m2K, and met or exceeded the 35 db IANL requirement across both the general building and the gymnasium. To combat reverberation and improve the acoustic environment in the gymnasium, ROCKWOOL Acoustic Infills were laid in the troughs of the pre-finished steel deck. The warm flat roof build up was finished with a Bauder Thermofol PVC layer.

Kevin Ryan, Director at Priority Roofing, commented: “We have worked with Bauder and ROCKWOOL on a couple of large projects installing both bituminous and single ply systems. We found the system both practical and efficient to install. The combination of the availability of the products and the technical backup received was superior to any other system that we have worked with.”

To find out more about how ROCKWOOL supported the new flat roof construction at Clarin College, please visit: www.rockwool.com/uk/clarin-college/

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