Hollow soffits are most commonly used in conjunction with PVC Fascia and Cover boards, but they are also useful for covering larger areas such as porch celings, gables and dormer window cheeks. Edge and joint trims are available to complete the range, the most common being the J trim, which is pinned to the underside of a soffit bearer or wall batten and allows the soffit to be neatly slotted in place.

As hollow soffits are secret fixed (each fixing is hidden by the tongue and groove joint), cladding nails should be used to install this system.

When used as a soffit these boards carry a 10 year performance guarantee and a Class 1Y fire rating in accordance to BS 476-7: 1997.