Installation 1.10 (pdf)

Industrial renovation and
super flat floors
Loading platform, with resin or PU coating
Installation - phase by phase
Substrate preparation:
13.5.2011
• Grind, shot blaster or mill off any material layers that could weaken the bond,
such as old paints, screeds, gypsym, magnesia, asphalt, cement lime, grease, oil
soaked layers, glue or similar. Vacuum clean any residual dust. The pull off
strenght of the cleaned concrete should be >1.5 MPa. If this cannot be
achieved, see the weber Substrate Guide for possibilities of how to strengthen
the substrate.
• Hair cracks in old, dried concrete will usually not need any special attention.
Cracks, visible with the bare eye and cracks where the concrete has clearly
suffered should however be injected with weber.floor 4712 epoxy primer.
Dilatation joints and cracks throughout the whole concrete slab will most likely still
move with changes in the ambient temperature and such cracks will therefore
most likely show up also in the new floor.
Preparations:
• Install eventually needed stoppers and tighten any possible leakages. Separate
the floor from the vertical structures by using weber 4960 Soft Strips towards the
walls and tighten these with eg. PU-foam or acrylic mastix between the strips and
the old floor. This hinders movements in prefabricated structures to damage the
edge of the floor surface, as columns and walls move in comparison to the slabs.
First epoxy primer layer:
• The two components of the product must be mixed according to the data sheet
or the information on the buckets. Then, the weber.floor 4712 epoxy primer is
evenly applied on to the prepared surface and distributed evenly with a rubber
squeegee and a lamb's wool roller. The formation of puddles must be avoided.
Material consumption is approximately 400 - 600 g/m².
Second epoxy primer layer:
• Make sure that the previous coating adheres firmly to the substrate.
• The second primer layer should be applied within 24 hours, if the ambient
temperature is 23°C. Otherwise layer 1 will become hard and glossy and the
bond between the two layers might suffer.
• Mix the two components as above. The weber.floor 4712 is applied directly on
top of the hardened first primer. The formation of puddles must be avoided.
Material consumption is approximately 400 -500 g/m².
• The fresh second layer is scattered with fire-dried quartz sand, in such an amount,
that the upmost sand remains dry. After the primer has set, excess quartz sand
should be brushed or vacuumed off the surface before starting the next
application. The surface tensile strength has to be at least 1.5 N/mm².
Setting time before First layer 4712 Second layer 4712
next layer 12 h, max 24 h 12 h
Epoxy coating, 4740, layer 1:
• Before application of the coat, make sure that the surface is dry and clean, i.e.
free from any debris that could cause delamination.
• The two components of the weber.floor 4740 must be mixed according to the
data sheet or the information on the buckets.
• Then mix two parts (by weight) of the mixed weber.floor 4740 to one part
weber.floor 4935 fire dried special sand 0.1 - 0.4 mm. Consumtion, approx 1.2
kg/m² of weber.floor 4740 and approx 0.6 kg/m² of weber.floor 4935.
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1.10

13.5.2011
• Distribute the top coat evenly with a toothed spatula and roll over with a pig
roller to remove trapped air. Work in crosswise directions.
• Scatter with fire-dried quartz sand. Excess quartz sand should be brushed or
vacuumed off the surface after the layer has set.
Setting time before
weber.floor 4740
next layer 12 h
Top coating, 4740 (option A):
• Before application of the top coat, make sure that the surface is dry and clean,
i.e. free from any debris that could cause delamination.
• The two components of the weber.floor 4740 must be mixed according to the
data sheet or the information on the buckets.
• Then mix two parts (by weight) of the mixed weber.floor 4740 to one part
weber.floor 4935 fire dried special sand 0.1 - 0.4 mm. Consumtion, approx 1.2
kg/m² of weber.floor 4740 and approx 0.6 kg/m² of weber.floor 4935.
• Distribute the top coat evenly with a toothed spatula and roll over with a pig
roller to remove trapped air. Work in crosswise directions.
Setting time
weber.floor 4740
12 h
Optionally a 4753 Coating PU is applied as top coat (Option B):
• Before application of the top coat, make sure that the surface is dry and clean,
i.e. free from any debris that could cause delamination.
• The two components of the weber.floor 4753 must be mixed according to the
data sheet or the information on the buckets. Consumtion, approx 1.45 kg/m².
• Distribute the top coat evenly with a toothed spatula and roll over with a pig
roller to remove trapped air. Work in crosswise directions.
Setting time
Notes concerning all 2-component work:
weber.floor 4753
12 h
• Ambient air and surface temperature: minimum +8°C, maximum +40°C.
• The temperature of the surface should be 3°C higher than the dew point.
• Relative Humidity: at +10°C maximum 75 %, at +30°C maximum 80 %.
• Do not work during rising temperatures since this may result in the formation of air
bubbles (through direct exposure to sunlight).
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