Instructions for Using
Wizard Fibre
First apply a thin scratch coat of sand and cement (4:1 mix).
It is beneficial to include fibres in this coat but not essential.
If the concrete is dry and dusty it should be swept and dampened
just before application.
Leave the scratch coat to set for at least two days.
Prepare only sufficient render mix that can be used within
approximately 45 minutes at a time.
Dampen the scratch coat with a sprayer before applying the
render mix. Failure to do this will severely weaken the render
and may prevent good adhesion.
Work systematically away from your starting point so that
the leading edge has not set before applying the next strip.
If you do need to join on a flat surface then it is important
to taper off the leading edge before you finish so that you
get a good key when you continue.
The render should be applied at 5mm (min) to 8mm (max) thickness.
Work on an area that you can reach to trowel off again in
a few minutes.
In warm conditions it will take only a few minutes for the
material to begin setting and at this point it will need to
be trowelled off again to give a final finish. Spraying a
fine mist of water on the surface will greatly assist this
process. In cool weather it could be an hour or more before
final trowelling is possible.
Unless the weather is cool and overcast it will be necessary
to spray a fine mist over the completed surface several times
before nightfall to prevent it from drying too quickly.
For wildlife ponds the addition of a proprietary waterproofing
liquid (available from builders' merchants) to the render
will create a waterproof barrier that needs no further treatment.
For fishponds we would recommend that no waterproofer is used
in the mix but that a proprietary surface paint is applied
once the final render has set and dried. A low viscosity,
resinous type of paint will give the most durable finish.
The first coat will soak into the surface and the following
coats will build up a plastic-like finish. This type of paint
will not adhere if waterproofer has been used in the mix.
Mix proportions
1 - 2% fibres added to the total mix by weight.
3 parts of building sand to 1 part cement.
We recommend the use of a mortar plasticiser in the mix (available
at builders' merchants) because it makes application easier.
Coverage
A 1kg pack of Wizard Fibre can cover 8 - 18sqm at 5mm thick.
Mixing
Typical mix proportions:
5 litres cement, 15 litres sand, 225 - 450g fibres.
Notes
The addition of fibre to the mix will improve workability
up to about 90g per litre of cement and will decrease above
this figure. Maximum crack resistance and strength is achieved
at about this level. We suggest you experiment on a test area
before you begin the job.
Allow extra time in the mixer for fibre dispersal. We suggest
a minimum of 80 drum revolutions.
Do not attempt to render in hot, direct sunshine. The mix
will dry out rather than cure, and it will spoil. Do not apply
in frosty conditions.
This product should be applied only to surfaces that are sound
and stable.
Next >
| |
Final trowelling will produce a very smooth
finish.
The finished walls will be ready for painting
as soon as they are dry.
|