Base requirements and coating conditions
The strength class of the concrete must be at least C25/30 and the wear resistance class 3. The relative humidity of the concrete must be below 95% and the surface temperature must be at least +3⁰C above dewpoint. During the drying of the coating, the temperature of the ambient air, the surface and the coating must be over +15⁰C and relative humidity must be below 80%.
New concrete floor
Laitance and any uncured cement are removed by either surface grinding or shot blasting. All loose material that could negatively affect adhesion is removed, and cement dust is carefully vacuum-cleaned.
Old concrete floor
Laitance and damaged concrete are removed by grinding or shot blasting. All loose material that could negatively affect adhesion is removed, and the base is carefully vacuum-cleaned. Dirty floors should be washed and rinsed with synthetic detergent before performing any other base treatment work. Any old coat is removed completely.
Priming
Priming is done with Nanten HM Bio. The primer must close all the pores in the concrete, so that a sealed and intact membrane is formed on top of the surface. The primer is covered with primer sand as the work progresses.
Patching work
Small cavities and cracks are cleaned and filled with e.g. epoxy paste mixed from Nanten HM Bio and fine back sand. Larger and wider overfills, straightening and slopes can be made with a compound made of HM Bio and back sand (0.7–1.2 mm).
Mixing
Premix component A and component B of HM Bio Epoxy in separate containers, estimate the required amount of compound, taking into account the size of the area to be treated and application time of the compound. Mix the components together in the right mixing ratio, mix with a slow-speed mixer for approximately two minutes, avoid mixing air into the compound. Keep mixing and add the required amount of selected Nanten colour sand or colour sand mix, continue mixing for about one minute, make sure to scrape the corners of the container.
Mixing ratio
Part A: 2 parts by volume
Part B: 1 part by volume
Spreading rate
4 mm membrane thickness
Resin consumption in rubbed coating approx. 1.3 l/m2
Approx. 0.2–0.3 l/m2 in priming
Approx. 0.35–0.45 l/m2 in surface varnishing
Approx. 7 kg of back sand /m2
Coating
The mixed paste is poured onto the floor in a continuous flow and then applied at the desired thickness with an adjustable trowel. The application is done in lanes, so that the surface can be finished from the untreated floor. After application, the paste is sealed into a flat surface either by hand with a steel trowel or by rubbing it mechanically.
Surface varnishing
After the coating has been rubbed sealed and dried, it must be varnished with thinned Nanten HM Bio Epoxy. We recommend applying the varnish twice to make the surface hygienic and easy to maintain.
Skirting boards
Skirting boards are made with epoxy rubbing paste, but thickening agent (Sylothix) is added to the paste to make it easier to work. The skirting boards can be made 100 mm high, for example.
Varastointi ja jätteen käsittely
Katso erillinen varastointi ja hävitysohje https://www.fescon.fi/materiaalipankki