This paper is intended to help designers of new schools to assess the likely effect of rain noise from lightweight roofs and roof elements on the indoor ambient noise levels in rooms. It contains results from measurements of the sound intensity levels caused by artificial heavy rainfall on roof glazing, polycarbonate roofing and ETFE roofing, the latter with and without rain suppressors. The measured sound intensity data allow comparison of products and estimation of the reverberant sound pressure level in a room due to rain noise.