Interior walls can be treated in the same way as exterior walls, although usually a dry lined plaster board applied in the conventional manner is the preferred option. Battens can also be used to dry line.
Styro Stone does not need to be dry lined with thermally insulated 30-40 mm EPS backed plasterboard as in conventional build. The 50 mm internal insulation is already in place as an integral part of the Styrostone system. Yet Another Saving!
Technical notes for plastering internal walls:
Wet finishes do not usually require a reinforcing mesh.
Thistlebond is applied to the Styrostone* in an 8-11mm coat and left to dry overnight.
The following day, a 2mm skim of multi-finish is applied.
For dry lining, simply fix plasterboard to the wall with dabs of dry wall lining adhesive in the conventional manner.
Information supplied by British Gypsum 28th September 2001.
Further information is available on British Gypsum's Website
* The Styrostone surface can be roughened first with a wire brush or similar to provide additional key.
Fixing of Fermacell Dry lining to Styro Stone:
A uniform layer of adhesive (see below) should be applied to either the polystyrene or the reverse of the Fermacell boards using a 5mm notched trowel across the whole area of the board. The board should then be applied to the wall and levelled up.
Boards should be jointed using Fermacell Jointstik adhesive in accordance with the manufacturer's instructions. Once the wall adhesive and the Jointstik adhesive have set (typicaly 24 hours), frame anchors should be fixed through the boards into the concrete core. Fermacell recomend a minimum of 2 anchors per board.
All other jointing and finishing should be carried out in accordance with the manufacturer's instruction manual.
Two types of adhesive are suggested. For rapid fixing, Ardurit S16 adhesive is recommended. Where a slower setting is required, Ardurit X5000 is recommended. Both of these adhesives are manufactured by Ardex adhesives (01440 714 939) and the manufacturer's instructions should be followed in use.