Custom Decorative Plasters

Data sheet

P.O. Box 450163
Dubai, UAE
Tel : +971 50 281 48 44



PétraLine is a ready-mixed mortar, tinted, intended for the jointing with cut stone and brick surfaces.

Field of application

PétraLine is particularly well adapted to the repair of the joints, in interiors and exteriors, in walls which rough-casting material needs to breathe freely: i.e all cut stone or brick masonries coated with clay, with lime, or with plaster and more generally old masonries.
PétraLine is also appropriate in the cases of stones, or bricks, semi-bearing or fastened.


PétraLine has an exceptional capacity of protection and sanitizing of the walls:
the gypsum which it contains confers to it a great capillarity which makes it possible to drain and dry the rough-casting material, and the whole of the wall, down to the core of it.
This porosity greater than that of the stone or brick avoids the degradations of those which one can often observe on both sides of the joints made with too water-tight materials.
The formulation, completely free from hydraulic binders and rich in fat lime, ensures a perfect chemical compatibility as much with materials of masonry (brick or stone or coating mortar), without any primer of insulation or to ensure a grip, even in the case of capillary rising of selenious (gypsum)waters as in the regions where the stone was traditionally coated with plaster (Ile-de-France, Provence, the Alps, Burgundy, etc…).
The absence of shrinkage at the setting ensures a perfect adherence of the joint on the stone or brick, without any primer for adherence. After drying, PétraLine recarbonates to the air and forms a calcite on its surface which confers it a resistance to bad weather.
At its core, PétraLine remains flexible and plays its part of mechanical cushioning perfectly. PétraLine is not affected by freezing.

Limits of use

PétraLine should not be hydrofuged.
Moreover, PétraLine is not appropriate for the areas particularly solicited by water streaming or backsplashings, in particular wall bases.
In these 2 cases, use Pétrus Special Joint.
PétraLine can be used in the case of broad joints for irregular masonries (larger than 1 inch /2,5 cm), but, in this case, it can advantageously be replaced by the Coating of Montmorency.

Aspect and range

PétraLine is custom-tinted, for example in countertype of stones or bricks, from the whitest to the most sustained tones, or in countertype of joints of origin, or else according to any reference color.
It can be supplemented with sand or mica, according to the technical needs or the architectural choice.

Precaution of conception

Old masonries to coat must be protected from undesirable water intrusions (streaming, backsplashing, water rising up by capillarity,…).
Covers, chêneaux/ gutters, rain descents, protections of the projections, stringcourses, cornices, supports,sills, zinc works, flaps and backsplash panels must ensure their role normally.
One must particularly look after protections on the walls exposed to some dominant winds.

Preliminary works

In all cases, it is essential to purge carefully the old joints.
All non-adherent elements or of insufficient quality must be removed.
Masonry must be repaired (for example with Pétrus or Briqüs) and its pathologies treated before the repair of the joints.


The implementation of PétraLine must comply with the code of practice and our written specifications.
Because of the presence of fat lime in the product, it is recommended to wear gloves and protection glasses.
The Coating of Montmorency should not be applied below 41 F/5°C, nor on cold or thawing support .
It is necessary to ensure its protection (against direct action of the sun, rain, etc…) during work and the first week of drying.
Do not apply in very hot weather nor in full sun exposure.
The support must be moist in-depth but dry on the surface.
PétraLine is wasted manually using a mixer. It must form an homogeneous paste holding charges on at least 1 3/8 inch or 3 cm thick (12 to 13 liters per bag).
It is applied in only one layer, with no limit of thickness.
If necessary, the grip between 2 layers is ensured by a scraping of the first with a scraper.
The opening time of the product is of approximately one hour. The finishing is done by cutting with a berthelée (a sharpened rake), by coating with a straight edge, floating, scraping with a devil's hawk ( float with nails) or the gratton /scraper.
These completion steps can be carried out as soon as the setting is sufficient.
They can be followed by a washing or a sanding (grindstone polishing).


After complete setting, hardness is superior to 70 Shore C units.


1.2 to 1.5 kg/liter of joint, for a joint of 1 cm wide by 2 cm of depth, 250 to 300 g/ml (or 80 to 100 ml of joint per bag).


4 months away from humidity, in a dry and clean room.


in 55lbs/ 25 kg paper bags on pallets with streamers .
Color and grain custom-made.

Version 1.1

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