If you have a subfloor such as particleboard or hardboard, which are underlayments not recommended for Armstrong felt-backed sheet flooring, do you need to replace that underlayment?
If the particleboard or hardboard subfloor is in good condition, you can install an Armstrong Interflex® floor. Particleboard and hardboard are not recommended for fully bonded floors due to dimensional instability. They expand and contract at unpredictable levels and can cause a fully adhered floor to push up at the joints of the boards. Interflex floors are designed to span these irregularities in subfloors. They are installed perimeter bond only, and the flooring can expand and contract along with the movement of the subfloor so there is no buckling of the flooring at joints.
