To meet the sound requirements of Part E of Building Regulations you would need to build a Type 3 separating floor. This requires a timber joisted floor with a floating platform on 25mm of Earthwool Acoustic Floor Slab. An independent timber joisted ceiling is also required with 100mm of Earthwool Acoustic Roll between the joists, the joists should be fixed only to the surrounding walls and there should be a clearance of at least 100mm between the top of the ceiling joists and the underside of the base floor. The ceiling should have at least two layers of plasterboard with staggered joints and a minimum mass of 20.00kg/m2. Post Construction testing is required when adopting this form of construction.