An acoustic underscreed is essentially a resilient layer that is fitted between a concrete deck and the screed layer applied to level out the floor, ready to accept the floor covering being used.
Given where the acoustic underscreed is used this is normally used on new builds or where an existing floor is being replaced although it could be used on refurbishment projects if required.

As with other flooring products the underscreed’s are designed to ensure that the floor systems meet the target performance levels in Approved Document E.