Quick Links - Click To Jump To Section:

   
• Features & Benefits
• Surface Preparation
• Application

Features & Benefits

• Admixture with a base of special waterproofing agents manufactured from a formula developed in MAPEI Research Laboratories.
• When mixed with cement, sand, and water, Idrosilex produces an extremely compact mortar that is easy to apply with a trowel or rendering machine even on vertical walls
• Mortar prepared with Idrosilex has less capillary porosity than conventional cement mortars or lime and cement mortars
• The combination of the product’s waterproofing properties with an effective rendering system applied in several layers prevents continuity between pores and ensures thorough waterproofing even in the presence of counter-pressure

Surface Preparation

• The substrate should be prepared carefully to ensure thorough bonding of Idrosilex to the rendering or screed
• The surface must be thoroughly clean and solid. Remove old render, degraded or loose material, encrusted salts, organic residues, oils and grease
• Roughen concrete surfaces with a bush hammer
• Wet the substrate thoroughly, then remove excess water with compressed air or a cloth so that the substrate is saturated but the surface is dry

Preparing Mortar for Renders

Scratch Coat (First & Third Coat)

• Use from 1.5 to 2.5 kg (1.2 to 2 litres), the equivalent of a dosage of 3 to 5% by weight of cement
• Coverage: approx. 16 m² in thicknesses of 4 to 5 mm
• Pour Idrosilex Liquid into the mixer together with the other ingredients (cement, sand and water)
• The dosage varies from 3 to 5 kg every 100 kg of cement, depending on the grading of the sand. When using sand containing a large percentage of fine-graded aggregate, Idrosilex Liquid should be admixed in a dosage of 5%. For sand with less fine-graded aggregate, the ratio can be reduced to 3%
• Mix the mortar for at least 5 minutes to obtain the best results. The mortar should have a fluid consistency so it can be applied in thin layers with a trowel or with a rendering machine

Brown Coat (Second & Fourth Coat)

• Use from 1.5 to 2.5 kg (1.2 to 2 litres), the equivalent of a dosage of 3 to 5% by weight of cement
• Coverage: approx. 18 m² for thicknesses of 7 to 8 mm
• The dosage every 100 kg of cement depends on the grading of the sand, as indicated in the instructions for the scratch coat
• Mix the mortar in the mixer for at least 5 minutes. The mortar should have a plastic consistency so it can be applied vertically in thicknesses of 7 to 8 mm

Preparing Mortar for Screeds

First Coat (Primer)

• Use from 1.5 to 2.5 kg (1.2 to 2 litres), the equivalent of a dosage of 3 to 5% by weight of cement
• Coverage: approx. 25 m² in thicknesses of 2 to 3 mm. Mix the mortar in a mixer for at least 5 minutes
• The mortar should have a fluid consistency so it can be brushed on in thicknesses of 2 to 3 mm

Second Coat

• Use from 1.5 to 2.5 kg (1.2 to 2 litres), the equivalent of a dosage of 3 to 5% by weight of cement
• Coverage: approx. 10 m² in thicknesses of 7 to 8 mm
• Mix the mortar in a mixer for at least 5 minutes. The mortar should have a plastic consistency.

Third Coat

• Use from 1.5 to 2.5 kg (1.2 to 2 litres), the equivalent of a dosage of 3 to 5% by weight of cement
• Coverage: approx. 5 m² in thicknesses of 30 mm. Mix the mortar in a mixer for 6 to 7 minutes, adding only enough water to obtain mortar with a no-slump consistency

Application

Renders

• Using a trowel or rendering machine, apply the mortar in layers as follows:
  • Scratch coat, approx. 4 to 5 mm thick
  • Brown coat, approx. 7 to 8 mm thick
  • Scratch coat, approx. 4 to 5 mm thick
  • Brown coat, approx. 7 to 8 mm thick
  • Total thickness: approx. 25 mm
• Each coat should be applied before the preceding one has finished setting
• When there are prolonged interruptions between coats, freshen the surface by applying fresh mortar over the joint for 10 to 15 cm
• To waterproof a room thoroughly, before applying the rendering, reinforce the joint between the wall and the floor (the weakest point in the structure) with a mortar composed of 1 part by volume of cement, 1 part by volume of sand graded from 0 to 2 mm mixed with a solution of 1 part Planicrete and 1 part water.
• The mortar must have a plastic consistency

Screeds

• Brush on the first coat of mortar with a fluid consistency in a thickness of 2 to 3 mm, then immediately apply the second coat of mortar with a plastic consistency in a thickness of 7 to 8 mm, giving it a rough float finish
• Within approx. two hours, before the preceding coat has finished setting, apply the third (and final) coat of mortar with a no-slump consistency approx. 30 mm thick
• Tamp the fresh mortar vigorously until bleeding occurs and finish with a float
• Second pours are to be avoided
• In case of prolonged interruptions, start up again by overlapping one coat over the other for 10 to 15 cm
• Total screed thickness: approx. 40 mm