5589This paper provides a preliminary report of an experimental study to confirm construction details that affect the low frequency impact sound insulation offered by platform wood frame constructions. The paper shows that ceiling mounting, floor stiffness, and floor toppings can be effective methods to improve impact sound insulation from the "bang machine" heavy impact source. Additionally, the paper shows that in the frequency range where the single number ratings are controlled direct transmission dominates but flanking is sufficiently important to affect the apparent impact sound insulation to the room below. Measurements of flanking transmission to horizontally adjacent rooms indicate that the floor-floor path can generate impact levels comparable to the direct path to the vertically adjacent room below. As such, good design should consider transmission to horizontally adjacent rooms.
A suburban school district experimented with painting acoustic ceilings in a 25-year-old elementary school building in an attempt to improve the appearance of the deteriorating tiles. Several ceilings were painted using a latex primer and acrylic semigloss paint. Following complaints by teachers the painting program was suspended and other approaches were tried to increase absorption in rooms with painted ceilings and/or decrease the effect of painting in rooms still to be painted. Measurements of reverberation were made for each condition in an effort to correlate the effect of painting acoustic ceilings.
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