Nusantara Archipelago Beachstone
Surface preparation
All substrates should be firmly fixed, flat, clean, dry and free of contaminants.
Deflection should be a maximum of 1/360th of the span for walls or floors. Concrete substrates and the mortar in bricks or blocks must be allowed to cure for 28 days minimum, cement render for 7 days minimum.
Painted surfaces must be sound after roughening with sand paper or wire brush. water based paints are not suitable substrates for tiling. Previously tiled surfaces should be firmly adhered, acid etched and roughened before over-tiling.
Wet areas require special attention involving appropriate substrates (e.g. concrete, compressed sheet, water resistant plasterboard, treated plywood) the use of reinforced waterproof membranes and in the case of floors a fall to the drainage point of not less
than 1:60.
Colour matching / pebble sizing
The stone tiles have the infinitely varied characteristics of nature. It is recommended tiles are laid dry and arranged if necessary to avoid abrupt colour or size variations. Crystal marble may be especially sensitive in this regard.
Adhesive
The manufacturer's literature will explain if a product is suitable for interiors and / or exteriors as well as walls and / or floors. A recognized adhesive manufacturer will have a range of products each appropriate to different substrates / potential substrate movement.
Cement based water mix adhesive is generally suitable on masonry substrates where no movement is anticipated. Where slight movement could occur through thermal or pedestrian loads a modified cement adhesive (probably two part) should be used as a minimum.
It is important that each pebble is embedded in the adhesive. Select a product suitable for application with a 10mm notched trowel, and apply no more than about 1m2 of adhesive
at a time.
Easier results are achieved with the lighter grade tiles 8mm, 11mm, 14mm thickness. The heavier grades 17mm & 20mm may have to be laid individually.
Waterproof membranes
These prevent the leakage of water through to sub floor or wall framing and / or habitable spaces below. Particular attention must be paid to carrying the membrane up the wall, outside shower boxes, installation of bond breakers and sealing around penetrations.
It is strongly recommended that membrane systems are used in all wet areas, including exterior suspended decking. Some systems involve the use of a primer.
Pre-sealing
This procedure can make the eventual removal of grout easier and may be carried out before the tiles are laid or just before grouting.
After ensuring the sealer is appropriate apply in accordance with instructions, remove any excess and leave to dry for at least an hour before proceeding to
lay or grout.
Ensure the sealer used is the same as or compatible with your final sealer. IMPORTANT! Test the sealers on an area first to ensure it is giving you the result you want and is compatible with the stone tiles.
Grouting
The grout should be suitable for joints up to 15mm in width and designed for external or internal conditions as your case may be. Generally grouts are water mix but where some flexibility may be needed then a latex additive or similar should be used in place of the water.
Experience indicates coarser grout works well in relatively large joints and is easier to use. In wet areas, however, finer, less porous grout should be used.
It is important to wait only the interval recommended by the adhesive and grout manufacturer before grouting to minimize dirt ingress between the pebbles and avoid the opportunity for other trades to dislodge pebbles.
Control joints
There are numerous reasons for building movement and control joints divide a larger tiled area into a series of
smaller ones.
Joints can be easily formed with two angles; sealant and bond breaker between them.
Designers may show points at which joints are needed but certainly where tiles adjoin walls or some other building material and where there is a control joint in the substrate among other circumstances.
Curved surfaces
The pebble sheets can be easily fitted around a gently curved surface - a column for example. If the sheet is turned around a right angle some stones will need to be plucked off the mat where they are distorted at the corner point and replaced with smaller pebbles to maintain uniformity at this point.
|
