Rockliner is designed principally as an acoustic dry lining board to meet the statutory requirements for masonry separating walls, for new build & refurbishment work.
Rockliner can also be effectively used to prevent flanking sound transmission when applied to external flanking walls.
It must be ensured that any external wall, to which the Rockliner is to be applied, resists the penetration of moisture.
In the case of solid wall constructions, the requirements of Building Regulations C4, Section 4 (and that of the Building Standards Scotland) should be considered, together with the recommendations of BS 5628: Part 3: 1985, ‘Materials and components – design and workmanship’ and BS 5390: 1976, ‘Code of Practice for stone masonry’.
There are two options: mechanical fixing or fixing with adhesive. The following information is given in good faith, but the method selected must ultimately be the decision of the dry lining contractor or responsible tradesman, having regard to the type and condition of the substrate to which the Rockliner is to be fixed. Reference should be made to BS 8000: Part 8, para 3.1.9.7.
Mechanical fixing
If the wall is true and level, the Rockliner may be fixed flush to the wall using nailable plugs. The nailable plugs are installed 50 mm from the edge of the board and @ 600mm centres. The cutting to size of the board and the maintaining of the acoustic/thermal connection is as for fixing with adhesive dabs.
Fixing with adhesive dabs
The choice of adhesive and the possible requirement for pre-treatment of the background for fixing Rockliner is dependent on the condition and the unevenness of the wall. High suction masonry and high density smooth concrete may require prior treatment with a PVA bonding agent to improve adhesion.
The 900 mm wide board is primed using three 200 mm wide continuous bands of bonding adhesive. The wall is dabbed out using standard drylining techniques, 3 rows of dabs, each dab approximately 250 mm long and 50-75 mm wide at 300 mm centres. Dabs should be applied in accordance with BS 8212: 1988 and BS 8000, Part 8: 1994 to give a minimum area of contact between the board and background of 20%.
The Rockliner is accurately cut to the full floor/ceiling height leaving the integrity strip intact at the bottom of the laminate. The Rockliner is then offered up to the wall with the lower edge resting on the floor. It is then firmly tamped back using a straight edge.
Note: On external walls continuous bands of adhesive are required around wall perimeters, at junctions with frames and electrical boxes (BRE Good Practice Guide 105).
Standards and approvals
Rockwool Insulation complies with the requirements of BS EN 13162: 2001 Thermal Insulation products for buildings Factory made mineral wool (MW) products specification. Separating walls
A separating wall is defined as a wall that separates adjoining dwelling houses, flats or rooms used for residential purposes. The Part E requirement for separating walls is subject to airborne sound regulations and pre-completion site testing.
