Masonry Mortar N15 is a ready-mixed, high-strength, powdered transpirant masonry mortar with very low emission level of volatile organic compounds made from natural hydraulic lime NHL 3.5 and NHL 5, reactive inorganic compounds, natural sand and special additives. This product is classified as G according to EN 998-2 Standards: “Guaranteed-performance, general-purpose masonry mortar for external use on elements with structural requirements” Class M10. Once Masonry Mortar N15 has been mixed with water in a cement mixer or other suitable container, it forms a masonry mortar with a plastic-thixotropic consistency which is easy to apply by trowel. Thanks to its special composition Masonry Mortar N15 has almost no hygrometric shrinkage, which drastically reduces the risk of cracks forming in the mortar. It also has properties that make it resistant to a wide range of aggressive chemical and physical phenomena.
Field of Application
• Building new load-bearing and buffer walls or rebuilding existing walls, including walls in listed buildings.
• Pointing between rows of stone, brick and tuff on natural-finish masonry.
• Making bedding and reinforced joints using rebar or composites.
• Building facing walls with high performance masonry mortar in compliance with the standards applied in seismic zones.
• Touching-up and plumbing facing walls with gaps and/or uneven surfaces.
COVERAGE / CONSUMPTION
Preparation of the substrate
Remove all traces of loose or crumbling material, dust, mould and any other material or substance that could affect the adhesion of Masonry Mortar N15 with either hand or power tools until the substrate is clean, sound and compact. Remove any weak bedding mortar between the masonry blocks. Clean the masonry with low-pressure water jets to remove any efflorescence or soluble salts present on the surface. Repeat this operation several times if necessary. Before applying Masonry Mortar N15, the substrate must be saturated to prevent it absorbing water from the mortar and affecting its final performance characteristics. Excess water must be left to evaporate off, so that the masonry is saturated and the surface is dry. If the substrate cannot be saturated with water, we recommend that it is dampened so that Masonry Mortar N15 adheres correctly.
Preparing the product
Mix Masonry Mortar N15 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 3 litres 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 Masonry Mortar N15 with a trowel. When touching-up or plumbing walls or building facing walls and buffer walls, form an installation bed and then lay the construction elements (stone, bricks, blocks and tuff), pressing down slightly so that they are in the correct position. Remove excess mortar with a trowel. If the mortar is used for pointing between blocks or bricks, apply a layer of mortar at least 5 mm thick and press it down slightly to encourage the adhesion. On natural finish walls, remove any excess mortar from between the bricks or blocks and pass a damp sponge over the mortar in the joints.