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Supplying fibres for all cement, mortar, screed and concrete

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Strong Rendering Mortar Fibres - Mixing Instructions

Strong FibresEquipment required for batch mixing by volume.

1 Belle cement mixer (90 litre), 3 plastic buckets (15 litre),1 hosepipe with a trigger gun.

Instructions for rendering onto bricks and blocks (not thermal blocks).

This is a (3 to 1) sand and cement mix using 20kg of cement and 0.6kg of fibres.

Put the recommended amount of waterproofer into a bucket, (about 200 to 250ml), Then dilute it with water and add it to the mixer, Add 3 buckets of sand into the mixer, at the same time putting water in to keep the sand turning over the mixer blades.

Now rub the fibres between your hands to remove any clumps, in a container and add them to the mixer.

When the fibres are dispersed, add one full bucket of cement, (this will be about 20kg). Do not over wet the mix.

If the building sand is very fatty in you area you can replace one or even two buckets of the building sand with plastering sand. The perfect mix is one that spreads easily but is low in water content.

Dampen the wall you intend to render and apply 5mm of mortar, let the water suck in and apply another 5mm of mortar on top of your first coat on the same day and scratch it. This base coat is a perfect receiver for a wet dash, a dry dash using fine fibres, a smooth render with fine fibres with a (3 to 1) mix, or even a (4 to 1) mix using all plastering sand.

One mix will cover 9 square metres 5mm thick (approximately).

If you require smaller quantities of mortar, the cement to fibre ratio is 1kg of cement to 30 grams of fibre. The sand is measured by volume of the cement.

Instructions for rendering a fish pond or pool for a waterproof mortar.

This is a (2 to 1) sand and cement mix using 20kg of cement and 0.6kg of fibres.

It is not necessary to put waterproofer in this mix.

Add 2 buckets of soft building sand,

OR 2 bucket of sharp sand and ½ a bucket of lime, into the cement mixer with water. Add the fibres to the mixer with some more water, being careful not to add to much water. When the fibres are well dispersed add one bucket of cement (20kg). Add only enough water to give the desired degree of workability.

Dampen the brickwork or block surface. It is only necessary to spread a 6mm thick coat of mortar onto the surface to give a waterproof coating. But it is advisable to give the surface two coats on the same day to ensure full waterproof protection.

One mix will cover 6 square metres 6mm thick (approximately)

If you require smaller quantities of mortar, the cement to fibre ratio is 1kg of cement to 30 grams of fibres. The sand is measured by volume of the cement.


Do not rush the mix, let the fibres disperse properly.

Always batch mix with buckets, do not try to guess with a shovel.

Use a hosepipe with a trigger gun, not buckets of water.

Do not under fill the buckets, or over fill, do not press the sand down in the buckets.

Do not work in the hot sun, if the sun comes out, cover your work with black plastic, wet sheet or sacking, do not let your work dry out fast in the hot sun.

If you rub the mortar as it is drying with a sponge some fibres may set sticking out. These may harm your fish if you are constructing a pond. To over come this you can singe them back with a blowtorch when the render is dry. Fishpond internal corners should be rounded slightly, not square.

To ensure the fibres disperse quickly in the mixer rub them between your hands to remove any clumps.

Do not apply more than 8mm to 10mm of mortar in one coat.

Before adding waterproofer to the mixer, dilute it in a bucket first.

Scratching a base coat render should be done with small wavy lines, not criss-cross diamond lines. This information is common building practice.

Completed fish pond should be filled with water as soon as possible, then left to stand as long as possible to let any chemical in the cement leach out into the water. Then empty the pond and refill. Always test your water before putting any fish in the pond.

If you are going to paint the pond surface with a pond paint, it is not necessary to use a waterproof mix, a 3 to 1 mix is strong enough. However a 2 to1 mix is belt and braces.

Technical help line 01773 742233.

DE5 3GH.