Industrial quartz concrete can be coated over after shot blasting or diamond wheel sanding (max humidity content 4 %).
Tiled surfaces must be made rough using a diamond cup wheel.
Large wood panelled surfaces can be coated over after treating the gaps with NORPHEN PU reinforced with a 160g/m² GLASS MESH strip (about 57 cm wide), followed by fine dusting with 0.10.5 mm. quartz sand.
Detailed surface preparation
1) Surface humidity content lower than 4%:
- Before you pour MARMIX directly over it, make sure the underlayment is cohesive enough
- Prepare MARMIX according to the instructions given further down on this card, and pour it onto the surface with the specially thick spatula supplied by NORD RESINE, without using a bubble bursting roller.
2) Surface humidity content between 4 and 5 %:
- Apply a coat of NORPHEN SW SOLID diluted with 1 part water; you will need approx. 100g/m² product
- The day after, you can spread MARMIX over the surface.
3) Surface humidity content higher than 5%:
- Apply a coat of NORPHEN SW SOLID diluted with 2 parts water
- Smooth over with NORPHEN W3 (amount needed: c.1.5 kg/m²)
- Wait 48 hours at 20°C, then go ahead and pour MARMIX over.
4) Industrial quartz concrete:
- Shot blasting is the best way to prepare this type of surface for MARMIX application
- On the now rougher surface you will be able to spread the product directly with no need for further preparation procedures.
5) Section gaps
Pay special attention to section gaps; this the procedure to follow:
- a. industrial quartz floors up to 15 cm thick, less than 1 year old, with only one reinforcing mesh: fill up throroughly with NORPHEN FONDO SL, even repeating the operation a few times
- b. floors as above, more than 18 cm thick and with two reinforcing meshes or else floors with only one reinforcing mesh and more than 1 year old: fill up the gap with extruded-expanded material and seal with NORPHEN FONDO SL, thickened with c. 3% SILICA (in weight).
Preparing and laying the mix:
pour MARMIX component A into a suitable container (a bucket will do), followed by component B, and mix to obtain a homogeneous mixture;
transfer to a cement mixer suitable for thick and heavy mortars (e.g. a vertical one with fixed drum and moving blades); add MARMIX component C, mixing to obtain a homogeneous mixture with no dry lumps of powder;
proceed immediately to pour and spread the mix.
Use: the special NORD RESINE thick spatula designed for use with MARMIX (“MARMIX” spatula).
Do not use: a bubble bursting roller to help spread the resin, as you may leave behind small lumps of resin and inert material.
MARMIX’s gel-time is long enough to allow for easy handling, provided the product is kept cool in summer and warm in winter.