Acoustical Coating Description and Purpose
This article is in two parts. Part 1 deals with the general description of the process and in what situation it is generally recommended and what it can do to the surface when it is applied. In Part 2, we will discuss the important points to be considered before you select acoustical coating, the importance of testing the product by accredited laboratories before buying it and the methods of testing and approval of the same.
Even before we start discussing any further about the details of acoustical coating, it may seem sensible to describe this item and what are its general applications.
The maximum demand for acoustical coating comes from jobs requiring refinishing of surfaces of products that already have some acoustical property (they absorb sound) and the purpose now is to add this fresh coating without damaging the existing quality of absorption of sound. Again, the maximum demand is in case of ceilings… that is why the term “Acoustical Ceiling Coating” has become so common.
Irrespective of the nature of the case, there must be a distinction made between an acoustical coating and a conventional paint. Also, it should be a matter of concern that once you apply the wrong coating on an acoustical surface, you cannot easily remove it and such a mistake could cost you dearly. Through the following article it is intended to throw some light on what exactly an acoustical coating can do and offer some suggestions as to how you will be able to identify one with some amount of confidence even before you apply the same.
Acoustical Coating – what it is capable of doing
First, let us examine the surface that is covered by an acoustical material like an acoustical plaster or an acoustical ceiling tile. You can observe that there exist several little crevices or holes all over, or quite often rough uneven surface textures. Just below the surface you will see a relatively spongier softer material that is intended to absorb sound.
These crevices or holes are the only passages through which the waves of sound can enter through the external surface and get absorbed into the inner spongy material. Because of this, whatever coating that you apply on the outer surface must be so formulated that it leaves the holes and crevices open without sealing them off with the pigment of the paint. The acoustical coating, consequently, is called as “non-bridging” material. Or we may say that, the product molecules will not connect with each other span or “bridge” the open spaces or gaps on the surface.