Applications
AIMcoustic Floor Slab may be used under a fine concrete screed in ‘wet’ construction, or under flooring grade chipboard in ‘dry’ construction. The tissue facing allows the laying of wet screed directly to AIMcoustic Floor Slab without building paper. Rebated edges, if chosen, help prevent grout leakage and thermal/ acoustic bridging.
Notes to all tables
Calculated in accordance with BS EN ISO 6947 : 1997 and Approved Document L2 2002 The Building Regulations 2000. The calculations assume that there are no air gaps in the insulation layer. This means that the insulation must be installed so as to join tightly. P/A is the perimeter of the building divided by the area.
Installation
The sub floor must be structurally sound and level. AIMcoustic Floor Slab will accommodate minor imperfections of flatness and burrs of concrete but for more major unevenness, it will be necessary to lay a levelling screed, or sheathing ply over timber.
Damp Proof Membrane
A DPM is required under AIMcoustic Floor Slab when laid on ground and on upper concrete floors to prevent moisture migration.
Perimeter Strip
The perimeter of the floor should be lined with AIMcoustic PE Isolation Strip, to allow for acoustic isolation and expansion of chipboard surface layer (where used). The depth of the AIMcoustic PE Isolation Strip is to be the thickness of AIMcoustic Floor Slab plus the thickness of surface layer (i.e. screed or chipboard).
Laying AIMcoustic Floor Slab
Boards should be laid lengthwise to the longest wall (having removed the rebated edge where the slab abuts the wall), with staggered joints, tissue face upwards.
Chipboard Surface Layer
Flooring Grade P5 T&G Chipboard should be laid with staggered joints, the long edges being parallel with the longest wall. All tongue and groove joints should be glued with PVA adhesive.Temporary wedges should be used at the perimeter to hold the tongue and groove joints tight, whilst the adhesive sets. When the adhesive has set the wedges must be removed and damage to the Isolation Strip made good.
At door thresholds, or where a change in floor construction occurs, a timber batten of the same thickness as the insulation should be inserted to reinforce the edge. Skirting boards should finish approximately 5mm above floor level and be isolated from the chipboard with AIMcoustic PE Isolation Strip.
Screeded Surface Layer
The Screed should be of fine concrete and a minimum depth of 65mm (75mm for non-domestic applications). A light wire mesh is required in the screed. An upstand of AIMcoustic PE Isolation Strip is required at perimeters.
