Rødvig Lime Water
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Product Description
Lime water is a saturated lime solution which has been tapped from settled wet-slaked Rødvig slaked lime, mixed with normal water. The mixture consists of one part Rødvig slaked lime putty and 5 parts water, which have been stirred into an even, white ‘grout’. Once the white pigments have settled, the clear, saturated solution of calcium hydroxide (lime water) Ca(HO)2 is scooped into buckets with hermetic lids.
Field of Application
- For watering down the masonry before plastering or whitewashing to add extra binders to the surface.
- For lime milk in a particularly good quality where Rødvig slaked lime is mixed with lime water to lime milk in the ratio 1:5.
- For maceration of colours where lime-proof colours are soaked in lime water in the ratio 1:1 at least a day before the lime milk, sand lime, finishing coat or slaked lime mortar has to be added.
- For mixing water used when preparing particularly good mortars, which is supplied with extra lime binders due to the lime water.
- For surface protection of newly whitewashed or plastered walls or polished masonry in which it can bind the grout and prevent it from crumbling.
- For glazing where lime water is mixed with lime-proof colours.
Packaging
Rødvig lime water is stored and sold in 18-litre plastic buckets with hermetic lids.
Lime water is delivered with colours, as coloured lime water or as ordinary lime water without colours.
Additional Information
KALK A/S has been the market leader for many years with products used for renovation of conservation and listed buildings among others. The products can also be used for new construction because of the good physical properties of the material:
- Great flexibility in use
- Great elasticity and adhesion
- High tensile strength
- Good porosity, which provides excellent insulation and moisture conditions.
We have extensive experience in assisting clients in the use of our products. The technical guidance, which we can offer, merely serves to aid you with experiences. Therefore, we do not take on the responsibility of being planning technicians. With regards to renovation work, we can refer to technicians who are familiar with renovation work on buildings worthy of preservation.
Mixing
Lime water can be manufactured on the construction site by mixing 1 part Rødvig slaked lime (lime putty) with 5 parts tab water. These parts are whipped thoroughly until the lime putty has completely blended in with the water.
The mixture is left for at least 24 hours, after which the white pigments have precipitated and the clear, saturated solution of calcium hydroxide - lime water Ca(OH)2 - floats on the surface in the tub. It is recommended that you cover the tub securely with plastic in order to stop the passage of the air and thereby a quick hardening on the surface in form of a layer of lime crystals CaCO3.
Lime water is suck or scooped very gently into buckets that are closed hermetically. Be careful not to stir so much in the lime water that the white pigments mix with the lime water. After the lime water has been scooped over, you may repeat the process by adding the same measure of tab water. It is advisable to stop after the fifth time, after which the white lime can be thrown away.
Execution
Reinforcement of lime
plaster:
If the crystal net of a lime plaster worth keeping has begun
to dissolve, a smaller layer of plaster of a few centimetres can be re-built by
adding lime water. The work must be carried out in the shadow.
To begin with, the walls are flushed with tab water all the way in to the masonry. As soon as the surface has stopped shining, plenty of lime water is applied to the walls, and once the plaster has been flushed, the lime water is dragged all the way through the plaster. The process should be repeated as many times as necessary for a complete build-up of the crystal net to take place all the way through. A few degrees’ difference in the temperature between cooled lime water and a warmer masonry will speed up the process due to the fact that the concentration of dissolved Ca(OH)2 increases with falling temperatures.
Glazing with coloured
lime water:
The work must be carried out in the shadow. The walls must
be moistened to avoid a drying-up that is too strong. The base for glazing
should be as open as possible. For instance, facades that are plastered with
lime and hydraulic lime mortars as well as facades of hand-moulded or
soft-moulded bricks with a good absorbency and rough, porous surface are
suitable. Facades of hard cement mortars and dense machine-moulded bricks are
not suitable.
It is recommended that you do tests on the desired base. After the surface has dried, the final result can be assessed.
The work must be carried out in one single working process and finished off in places where you cannot se colour differences, such as corners, ingoing window openings, downpipes and horizontal protrusions. If the facade is so big that it is not possible to finish in the same working period as you started, you should divide the area into suitable sections where you make your own joins, accurate and even.
The work is carried out in the shadow, with a sponge or with a brush. The texture can be adjusted by removing or adding lime water. During the performing of the work, the coloured lime water must be activated constantly to achieve an even colour coat. Glazing can be done one or several times, depending on the desired appearance, but the treatment should be allowed to dry up each time.
Finishing treatment
with lime water on facades:
Facades that are plastered/smoothened with or without
pigment, glazed/whitewashed with or without pigment as well as fired surface reinforced
and glazed on the facade bricks, are finished off with lime water, one or
several times. Lime water treatments yield a natural protection, without being
too dense for the natural damp transmission from inside, as these facades requires.
The work is carried out in the shadow with a brush or by spraying.
The use of the old well-known lime water, the whey, has come back into the limelight because no better agent exists for treating good brick and mortar facades that require a free transmission of damp and humidity. Working with lime water should normally not take place when the temperature is below +5° degrees, and it must take place in the shadow. When working with dry walls, you should water down with normal tab water. Lime water is stored in a frost free place that is tightly closed, to avoid air passage.
Maintenance:
Surfaces that are treated with lime water do normally have
an age long durability. Unfortunate impacts as alga, large amounts of exhaust
fumes, mechanical impacts etc., may cause a quick discoloration. Flaking of the
base on which the glazing took place, will require a repair of the flaked area
with the same mortar as the one that was used for the plastering. Mortar is
gently applied, only on the damaged area, and after the drying-up, it is glazed
with the same lime water - only on the repaired areas. Glazed areas patinate
over time. The time for cleaning/giving the finishing treatment should be based
on individual judgments.
Limitations for use
Lime water should not be used when the temperature is below +5° degrees , and it must take place in the shadow.
Storage
Lime water should be stored with hermetic lids and in a frost-free location. The durability is unlimited if these conditions are met.
You can find product sheet, safety data sheet and performance declaration for Rødvig Lime Water by clicking on the image below.
