We do air tightness testing and want to offer sound testing as well, how do we apply?

Membership of the Association is open only to those companies who can demonstrate they have the technical expertise to provide advice to clients, not merely testing services and companies which simply wish to undertake sound insulation testing would be unlikely to obtain membership. Go to the membership page of the website and complete the form. A full package of information will be emailed to you by return. Part of this are application guidelines which will enable you to assess whether your company is likely to be suitable for Association membership.