Mapei Purtop Easy

Mapei Purtop Easy is a single pack elastic polyurethane waterproofing membrane for roofs, balconies, walkways and green roofs.

Best Uses

Mapei Purtop Easy is a ready-to-use aromatic polyurethane waterproofing membrane developed by MAPEI Research & Development laboratories. Once applied, in just a few hours Purtop Easy forms a seamless, elastic membrane with no overlaps and excellent crack-bridging properties, which is able to withstand normal dynamic stresses acting on structures. Thanks to the complete range of primers available, Purtop Easy adheres perfectly to numerous types of substrate. Purtop Easy has excellent mechanical properties that remain stable over the years, making the product highly durable. Purtop Easy is easy to apply by trowel or spray on horizontal, vertical, and sloping surfaces.

Mapei Purtop Easy forms a highly elastic and durable membrane ( Purtop Easy System Roof has a certified service life of 25 years according to ETAG 005). Purtop Easy is a one-component, ready-to-use product and is very easy to apply.  When admixed with Mapei Purtop ADY, Purtop Easy can be applied in a single coat of 1.2 mm thickness, with improved mechanical properties and reduced drying time. Purtop Easy maintains its mechanical properties at temperatures down to -40°C.

Mapei Purtop Easy is ideal for waterproofing new roofs and repairs to existing roofs, terraces, balconies, walkways, and pedestrian areas in general, and applying on to green roofs. Purtop Easy can be applied on concrete, cementitious screeds, ceramics, fibre-cement boards, old bituminous membranes and metal.

Application

Preparation of the substrate
All substrates, whether new or old, must be solid, clean, dry, and free of oil and grease, old paint, rust, mould, or any other material which could affect adhesion.

1. Application on concrete substrates and cementitious screeds
Surfaces must be prepared according to the type of substrate, for example by sand-blasting, shot-blasting, scarifying, bush-hammering or other methods. Then treat the substrate with a suitable primer as follows. Hollows, cavities, and detached portions in the substrate must be repaired with suitable products from the Mapegrout and Planitop ranges. Choose the most suitable product according to the thickness to be repaired, the time available, and the operating conditions on site.

After preparing the substrate, apply Mapei Primer PU Fast two-component polyurethane primer, or Mapecoat I 600 W, two-component epoxy primer in water dispersion, diluted in a ratio of 1 : 1 ratio with water, or alternatively Mapei Primer SN two-component fillerised epoxy primer, and then broadcast the surface while still wet with Mapei Quartz 0.5.

If the moisture content of the substrate is greater than 4%, and if it is not possible to wait until it drops to a lower value, apply two or more coats of Primer EP4 Fast, two-component epoxy primer, depending on the condition of the substrate, until the pores in the substrate are completely sealed.

2. Application on bituminous membranes
Clean the bituminous membrane to remove all traces of oil, grease, dirt in general and any other substances or material which could affect the adhesion of the following coat of primer. Remove all dust with a vacuum cleaner or compressed air. The membrane must be perfectly dry before inspecting the surface and any damage in the membrane, such as blistering, tears, or detached areas, must be repaired before applying the primer. Apply Mapecoat I 600 W two-component, water-based epoxy primer, diluted at a ratio of 1: 1 with water, to the existing horizontal surfaces and vertical hems by roller or airless spray, or apply Primer R30, a one-component, fast-drying polyurethane primer by roller or brush.

3. Application on metal surfaces
Check the state of the substrate and dry sand-blast the surface to grade SA 2½ (according to Swedish Standards). If it is not possible to dry sand-blast the substrate, prepare the surface using an alternative method, such as with a scrubbing-action or percussion-action cleaning machine. Once the metal surfaces have been prepared as specified, apply Primer EP 100W two-component, waterbased epoxy primer with a roller, brush, or airless spray, or alternatively Primer EP Ruststop adhesion promoter for polyurethane systems, with a roller.

4. Application on old ceramic floors
Existing ceramic, porcelain, clinker, etc. floors must be well bonded to the substrate and free of substances that could affect adhesion, such as grease, oil, wax, paint, etc. Prepare the surface with suitable tools and/or by sanding to remove traces of material that could affect the adhesion of Purtop Easy. Make sure the existing flooring is well bonded to the substrate and remove any detached areas. Fill these areas and any empty grout lines with Adesilex P4 cementitious skimming compound. Prepare the surface as specified, apply Mapei Primer SN two-component, fillerised epoxy primer with a trowel or by spray, and broadcast the surface while still wet with Mapei Quartz 0.5.
Before applying Purtop Easy, pay particular attention to the expansion joints, fillets between horizontal and vertical surfaces, which must be properly treated. In the case of fillet joints between horizontal and vertical surfaces, it is recommended to form a fillet with Planitop Fast 330, quick-setting cementitious mortar, or mixing Mapei Primer SN at a ratio of 1 : 7/1 : 10 with Mapei Quartz 1.9.

Structural joints must be previously treated with Mapeband TPE bonded to the substrate by means of the epoxy resin Adesilex PG4 (later, when applying Purtop Easy membrane, it is necessary to fix it at the sides of the tape, on Adesilex PG4, and avoid it gets in contact with the grey rubber part). Upon completion of the works, these joints must be protected with a suitable metal flashing.

Preparation of the product
Purtop Easy is a one-component, ready-to-use product, but it is recommended to mix it before use to make sure it is perfectly blended. In case it is required to apply the product in a single coat, it must be admixed with Purtop ADY, which is available in pre-dosed packs according to the different packaging formats of Purtop Easy.

Application of the product
After thoroughly preparing and priming the substrate, apply Purtop Easy starting from the fillet joints between horizontal and vertical surfaces. It is recommended to locally strengthen the membrane on fillet joints with a strip of Mapetex FG glass fibre reinforcing mesh, approximately 20 cm wide. The temperature of the substrate must be at least 3°C above the dew point, while its residual moisture should not exceed 4%. Apply at least two even coats of Purtop Easy with a trowel or by spray to form a total thickness higher than 1.2 mm. If Purtop Easy had been admixed with Purtop ADY, a 1.2 mm thick layer may be applied in a single coat. When the product is applied in two coats, it is possible to lay Mapetex FG, glass fibre reinforcing mesh, on the first coat while it is still wet. Wait until the first coat is completely dry before applying the second coat.

If the application of Purtop Easy is interrupted and then taken up again after the maximum covering time (24 hours), an overlap of at least 30 cm must be made after applying a coat of Primer R30. When applying Purtop Easy on vertical hems or on surfaces in general with a slope of more than 1.5%, it must be admixed with up to 3.6% by weight of Mapei Additix P thixotropising agent. Purtop Easy can also be applied by airless spray, when not admixed with Purtop ADY or Mapei Additix P. When applying Purtop Easy by spray, it must be diluted with 5-10% of Mapei Thinner PU.

Finish of the membrane
When a durable attractive coloured finish or a non-slip finish, coat Purtop Easy within 24–48 hours of application with Mapecoat PU 20 N two-component, aliphatic polyurethane finish, to be applied in at least two coats. If a finishing product is not applied over the membrane, it may lose its colour or chalk slightly. If installation of a ceramic covering on Purtop Easy is required, use Keralastic epoxy-polyurethane adhesive, Kerapoxy Adhesive, or Ultrabond EP 2K epoxy adhesives or, as an alternative, Kerabond cementitious adhesive mixed with neat Isolastic.

When using Kerabond cementitious adhesive, it is necessary to apply on dry Purtop Easy membrane a 1.2 mm thick layer of the same Purtop Easy while still fresh with Mapei Quartz 0.5.