Plaster Mortar M15

Basic filling material for brick or block walls for indoor and outdoor environments

Product Description

Plaster Mortar M15 is a light gray single-component premixed mortar based on hydrated lime, hydraulic binders, selected sands and special powder additives. Thanks to its particular composition, the plaster obtained by mixing Plaster Mortar M15 with water has a good quality adhesion and is particularly suitable for application with plastering machine on almost all substrates. Plaster Mortar M15 is classified according to the European standard EN 998-1 as GP “General purpose mortar for plasters internal / external “category CS III.

Field of Application

Base plaster on mixed masonry, new brick, concrete blocks and reinforced concrete cast on site, inside and outside, before carrying out the decoration with paints or thin coatings. Realization of lime-cement based plasters suitable for both interiors and exteriors of buildings for residential and tertiary use, commercial and industrial, to be carried out by hand or with a plastering machine.

Product Details

Product identity

Consistency: powder
Color: grey
Maximum size of aggregate (EN 1015-1) (mm): 1.5
Bulk density (kg/m³): 1,500
Chloride content (EN 1015-17) (%): < 0.05


Plaster Mortar M15 is supplied in:
– 25 kg paper bags


The consumption is approximately 1.8kg/m2 at 1 mm thickness.

Application Procedure

Preparation of the substrate

Plaster Mortar M15 can be applied on concrete substrates, existing or new masonry, brick, tuff and mixed as long as they are clean and consistent, free from crumbly parts, dust and dirt. Saturate with water the support and before proceeding with the application of Plaster Mortar M15, wait for the excess water to evaporate, so that the support is saturated but with a dry surface To facilitate the elimination of free water it can be compressed air is used if necessary. Concrete made by casting within formwork, must be clean and free from form release oils and greases. The latter they can be removed from the substrate by sandblasting or pressure washing. Any gaps or discontinuities in the substrate on which the plaster must be applied in uniform thickness they must be previously filled using Plaster Mortar M15. If the support is made of concrete, brick of old workmanship or mixed masonry, it is advisable to apply a first layer of Beton Contact, in order to uniform the absorption of the substrate and improve the adhesion of the plaster. It is also advisable to place vertical guides on the walls to be plastered, in order to define their flatness.

Preparing the product

Mix Plaster Mortar M15 in a cement mixer or in the hopper of a screw-type pump with a separate mixer, such as a Putzmeister S 5 or a similar machine. Small amounts of the product may be prepared using an electric drill at low speed with a mixing attachment. After adding around 5 liters of clean water for every 25 kg bag of product in a cement mixer or in the mixing unit of a screw-type pump, slowly add the powdered mortar in a constant flow. Mix for 3 to 4 minutes and then make sure the mix is well blended and even and that there are no lumps. Make sure there are no traces of powdered mortar stuck to the sides or bottom of the mixer.

Applying the product

Apply a layer of mortar from 10 to 20 m thick with a trowel or putty knife; no formwork is required. As soon as the mortar starts to set, tamp the surface with a sponge float. The waiting time required before carrying out this operation depends on surrounding weather conditions.