Children at the back or side ask for instructions to be repeated
A classroom nobody can concentrate in
A hard floor, a suspended ceiling that does almost nothing, and thirty children. A classroom with too much reverberation is not just unpleasant — it measurably costs the children furthest from the teacher and the children still learning English the most, and it is why so many teachers lose their voice by half-term.
Spot the mistakes
- ✗Children at the back or side ask for instructions to be repeated
- ✗The teacher's voice gives out by the afternoon
- ✗Group work in one corner distracts the whole room
- ✗SEN and EAL pupils struggle most, and it shows in the data
Show your working
a) A standard suspended ceiling tile absorbs surprisingly little — it is chosen for cost and services access, not acoustics.
b) With thirty children and one hard floor, speech keeps returning off every surface almost as loud as it left the teacher.
c) Younger children and anyone processing a second language rely more on the direct sound reaching them clearly — reverberation degrades exactly the cue they need most.
8 × 6.5 × 2.8 m, vinyl floor, painted plasterboard walls, mineral-fibre suspended ceiling.
BB93 gives around 0.6 to 0.8 seconds for a general teaching space — most untreated classrooms measure well above that.
Homework: fix it
- ✓Class-A acoustic ceiling tilesabout 50 m²
The standard, lowest-disruption fix — swaps for the existing grid, usually a holiday job.
- Wall-mounted absorber panelsabout 20 m²
Where the ceiling can't be touched, or as a second pass alongside it.
- Carpet tiles in reading/quiet cornersabout 12 m²
Cheap, targeted, and softens the loudest corner of the room first.
- Acoustic display boards instead of hard pin-boardsabout 15 m²
Absorption that does a second job — wall space you needed anyway.
Indicative figures for the example room (8 × 6.5 × 2.8 m, about 146 m³), from the same method the report uses. Your room will differ, which is the point of checking it.
Questions from the class
A. It can be, and a formal figure needs a measured survey to confirm it. Our figure is indicative — meant for deciding what to do and roughly how much of it, not a compliance certificate.
A. No — like-for-like ceiling grid tiles are one of the cheaper interventions on this list per square metre, which is exactly why ceiling area is usually the first thing to treat.
A. The evidence on reverberation and speech intelligibility for children — especially those with SEN or learning in a second language — is well established. We show you the acoustic figure; what a school does with it is a decision for the school.