Green Guide 2008 ratings
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Classroom Walls
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Classroom wall ratings apply to Education only
Functional unit for internal walls for Education:
1 m² of internal wall or partitioning between classrooms; to satisfy Building Regulations, in particular minimum 45 DnT(Tmf,max),w (dB) airborne sound insulation (Source: BB93) and mid-frequency reverberation time, Tmf, in classroom not to exceed 0.6 seconds (Source: BB93). Wall to be specified to Severe Duty (SD) as per BS5234-2. To include any repair, refurbishment or replacement over the 60-year study period.
For education buildings a functional unit based on a minimum acoustic performance has been used. Although a range of different performance thresholds could be identified only one functional unit was deemed necessary. This was because the difference between them was in reality only a small amount of additional insulation. This made no significant difference across the environmental impact of the specifications. We used the DFES standard specifications documents [1]&[2] and partition type B which were all classed as having acoustic performance greater than 45 Rw dB and severe duty robustness ratings, these documentation gave example specifications which were deemed compliant to the functional unit.
For walls within schools which do not need to have acoustic separation, e.g. within administrative areas etc, the commercial internal wall ratings should be used.
[1] Department for Education and Skills: Standard specifications, layouts and dimensions 1: Partitions in schools.
[2] DFES Building Bulletin 93, Acoustic design of Schools.
(both publications available at www.teachernet.gov.uk/acoustics)
For more information
Call us on 0333 321 88 11 if you would like to know more, or email enquiries@bregroup.com.