Before starting laying the product, it is very important for the contractor to carefully evaluate the characteristics of the subfloor and ensure that it is stable for the tiling or if it should be further prepared.
BEWARE! Any detachment of the stone tiling is always caused by a wrong assessment of the laying surface. The responsibility for said detachments is always of the tile contractor, as established by articles 1667-1669 of the Civil Code.
Any ORIGINEPIETRA tiling solution may be applied on structurally solid surfaces fir for a minimum weight of 50 kg per square metre. In particular, the gluing agent must not be torn and must be fit to tolerate the stresses and strengths that are created between the tiling and the structure, considering the different dilation coefficients of materials. The subfloor must be load-bearing and free from any substance that has a detaching action or components favouring corrosion (e.g. chlorides or disarming agents). Brittle layers or build-ups of fluid mortars must be removed. Any missing or empty point in the area close to the subfloor surface must be closed in compliance with the rules that apply for the restoration of the same subfloor.
Tear resistance of the subfloor: approximate average value 1.3 N/sq. mm., approximate average value 1.0 N/ sq. mm.
Minimum workability temperature: +5 °C.
Maximum workability temperature: +30 °C.
In case of critical laying subfloors with an insufficient mechanical resistance to bear the tiling, use a mechanical hook made with a reinforced coat of OPKOLL gluing agent with a minimum thickness of 5/6 mm, where a glass fibre mesh shall be poached (reinforcement mesh) and subsequently fastened to the load-bearing structure by using dowels of the appropriate length and type for the screed, with a max distance of 50 cm from one another (therefore a minimum of 8 pcs/sq.m.).
This document is to be considered as a simple tool to be used for preliminary inspections and technical indications, and for the maintenance of the products you selected and purchased from ORIGINEPIETRA. The information given below is to be considered as a mere indication, not binding for ORIGINEPIETRA, and in any case to be considered as a code of good management both for the installation and maintenance stages.
ERRORS TO BE AVOIDED BEFORE LAYING
1. Painted subfloors: if tiles are applied on a painted surface, the tiling will be completely removed over time.
2. Premixed plasters: some premixed plasters do not bear the weight of the tiling. WARNING: consult the manufacturer before laying the tiles directly on plaster.
3. Normal setting coat: normal setting or fine mortar finishing solutions (lime base) create a weak superficial layer that lacks texture, as if it were paint (without the appropriate mechanical resistance to bear a tiling).
4. Laying with adhesive (2 masses) only on the subfloor, without double spreading. The absorbance of the material combined with the absorbance of the subfloor create a rapid removal of water from the glue that blocks the ongoing chemical reaction and prevent anchoring to the subfloor.
5. Laying with excessively high subfloor temperatures: this causes the glue to be “burnt”; laying at temperatures below 0 °C causes the glue to “freeze”. The hardening and setting of a glue are chemical reactions triggered by the water in the mixture.
6. Laying on very absorbent and not water-resistant surfaces.
7. Preventive application of primers, adhesion or consolidation promoters: with unstable or previously painted subfloors, sometimes attempts are made at resolving the problem by using adhesion or consolidation promoters, but this is wrong because these products only affect the surface for a few millimetres and do not consolidate the entire part that lacks substance.