Chemical barrier

How it works

A homogeneous section of the wall is impregnated with RESISIL 910 waterproof product which is injected at low pressure in holes made at the bottom of the wall.
The liquid spreads in a concentric way from the axis of the hole until it interpenetrates with the liquid of the adjoining hole, creating a perfectly waterproof homogeneous horizontal strip.
RESISIL 910 is an alkoxy-siloxane based compound with low molecular weight which is solvent-dissolved and which spreads by imbibition of the thinnest capillaries until it completely impregnates a masonry belt. It covers capillaries with a silicon-based resin which decreases surface tension. This way a marked decrease of wall wettability which stops the capillary rise of water from the subsurface is achieved.

Advantages

• The RESIMIX CHEMICAL BARRIER blocks rising damp once and for all because it forms a physical barrier which cannot change with time.
• The injected product is firmly anchored to the building material, it is not affected by the basicity or acidity of the walls, UV rays, climatic conditions and action performed by microorganisms.
• Impregnation is carried out indoors or outdoors, it does not block capillaries and it does not change transpiration of water vapor.
• This type of operation is not traumatic for walls and it does not weaken the static condition of the structure.
• The operation is fast and is carried out only by qualified and specialized personnel.

How to apply

The technique to implement a chemical barrier is not unique, but varies depending on the type of masonry where the intervention takes place and if coating is present or not. The table illustrates the most frequent types of intervention:

The following procedure illustrates a typical dehumidification intervention using a chemical barrier.

	1. De-plaster the wall 50-70 cm above the highest rising point; brush and restore any irregularities using mortar. Drill 16mm diameter holes on a horizontal plane and 10 cm from the floor height, 10-15 cm far from one another. Depth is 4/5 wall thickness. On non-absorbing bricks, holes on the mortar are on two alternate planes. Mixed walls need two lines of holes drilled in the joints.
	2. Clean holes using a vacuum cleaner.
	3. Inject RESISIL 910, using INIETTO 910 equipment made of a pumping assembly with regulators, to keep pressure, which goes from 0.5 to 6-7 atm depending on wall porosity, constant. Based on initial absorption tests and the indicators of the pumping group we determine the quantity of RESISIL 910 to be injected.
	4. Stucco the injection holes and spray or brush apply RESISIL 910.
	5. Apply two coats of RESISEAL salt barrier; alternatively perform a scratch coat of mortar mixed with an additive using AERMIDE if the masonry has an irregular surface and then needs to be plastered.
	6. If the wall remains fair-faced, spray apply SILOXIL 500 waterproofing product (solvent-based) or RESISIL 911 (water-based).

Consumption:
Consumption of RESISIL 910 is of 300 gr per cm wall thickness per meter long; e.g. for one meter of wall 40 cm thick you need approx.. 12 l. The consumption of RESISEAL is of 2.5 kg/m2.