Failing to undertake proper subfloor preparation before the application of new floorcoverings can result in an unsightly finish or even complete floor failure, leading to costly remedial work. Fortunately, this can be avoided by adhering to just a few basic principles of subfloor preparation, including the need to guard against excess subfloor moisture – the leading cause of subfloor failure. Stephen Boulton, Technical Service Manager at leading manufacturer of subfloor preparation products, F. Ball and Co., goes through these processes.