Mapei Planitop HDM Maxi

Mapei Planitop HDM Maxi is a two component ready-mixed pozzolan-reaction fibre-reinforced mortar for structural reinforced reinforcement when used in combination with mesh from the Mapegrid range and for smoothing and levelling concrete and masonry.

Best Uses

Planitop HDM Maxi is a two-component, high-strength cement-based mortar with glass fibres, selected aggregates in a granulometric curve, special admixtures and synthetic polymers in water dispersion according to a formula developed in the MAPEI Research Laboratories. When the two components are mixed together they form a plastic-thixotropic mix which may be applied by trowel or spray in layers up to 25 mm thick on horizontal and vertical surfaces. Planitop HDM Maxi has high adhesion strength and when hardened forms a compact layer that is impermeable to water and aggressive gases present in the atmosphere while remaining permeable to water vapour.

Planitop HDM Maxi meets the requirements of EN 1504-9 and the minimum requirements of EN 1504-3 for R2 class mortars. Furthermore, Planitop HDM Maxi is classified as M25 masonry mortar according to EN 998-2 and as GP render, category CS IV according to EN 998-1.

Mapei Planitop HDM Maxi is used in combination with Mapegrid G 120 and Mapegrid G 220 primed alkali-resistant A.R. glass fibre mesh or Mapegrid B 250 primed alkali-resistant basalt fibre mesh to structurally reinforce stone, brick, tuff and mixed masonry structures. The system complies with the approach defined by the guidelines for the approval of FRCM (Fibre Reinforced Cementitious Matrix) systems.

Planitop HDM Maxi may be also be used on its own to restore the texture of masonry or to level and even out the surface of reinforced concrete and masonry. Moreover, Planitop HDM Maxi is part of Mapetherm Tile System, for installing tiles and slabs on external wall insulation systems for façades.

Some application examples include:

• Cladding facing walls, vaulted ceilings and masonry in general after patching them up
• Used in combination with mesh from the Mapegrid range to increase the shear/tensile strength of bay walls for structures in seismic zones and for structural consolidation
• Used in combination with mesh from the Mapegrid range to structurally strengthen the internal and external face of arched and vaulted masonry elements
• Levelling and repairing reinforced concrete structures

Application

Preparation of the substrate
To ensure good adhesion of the system particular care must be taken when preparing substrates, which must be perfectly clean, sound and free of crumbling areas, dust, oil and old paint. Sandblasting or a thorough cleaning with high pressure water jets is particularly suitable. Before applying the product wet the substrate so it is saturated with a dry surface (s.s.d. condition). For absorbent or weak surfaces we recommend priming the substrate with Primer 3296 or with Mapei Primer G if gypsum is present.

Preparation of the mortar
Pour component B (liquid) into a suitable clean container and slowly add component A (powder) while stirring with a mixer. Carefully mix Planitop HDM Maxi for several minutes, making sure no powder remains attached to the sides or bottom of the container. Keep mixing until thoroughly blended (completely lump-free). A mechanical mixer at low speed is recommended for this operation to prevent entraining too much air into the mix. Avoid mixing the product manually. Large quantities of mortar may be prepared with a cement mixer. When applying the product by spray use a rendering machine with a worm-gear pump such as a Putzmeister SP11. In hot weather the consistency of the mix may be modified by adding extra water up to 2% in weight of the powder.

Application of the mortar

1. If the surface is particularly uneven level it off with layers of Planitop HDM Maxi up to 25 mm thick applied with a smoothing trowel, trowel or by spray
2. Leave it to harden for 18 - 24 hours
3. Apply an even layer of Planitop HDM Maxi around 5-6 mm thick with a flat metal smoothing trowel
4. While the product is still “wet”, place Mapegrid mesh on the surface and press it down with a flat smoothing trowel so that it adheres to the mortar
5. Apply a second layer around 5-6 mm thick of the same mortar used for the first layer so that it completely covers the Mapegrid mesh
6. Smooth over the surface of the mortar with a smoothing trowel

Overlap adjacent pieces of Mapegrid by at least 15 cm both lengthways and widthways.