Just Add Water

Select your question below

How many bags of pre-mixed Concrete Mix are required to fill a cubic metre?

How many standard bricks and blocks does a bag of mortar lay?

What does the term MPa mean?

How many days after application can I paint render?

Does paint need to be removed from a surface before I render it?

Does the temperature of the air on the day affect the use of concrete products?

When is it best to finish mortar joints?

How do you cure freshly laid concrete?

What product is recommended for filling gaps in paving greater than 3mm?

What is the right consistency for good quality concrete?

How do I mix Concrete Mix?

How do I use Rapid Set Concrete to set a post?

How much water should I add per bag of product?

What is the coverage of one bag of Render It™?

How many ridge or hip tiles does one bag of Roof Tile Bedding Mortar lay?

What is the right consistency for good quality concrete?

How do you cure freshly applied render?



How many bags of pre-mixed Concrete Mix are required to fill a cubic metre?

Approximately 110 x 20kg Concrete Mix bags are required.

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How many standard bricks and blocks does a bag of mortar lay?

A bag of 20kg Mortar Mix will lay 20 house bricks or 10 masonry blocks with a 10mm mortar joint if mixed correctly.  Always read and follow the instructions on the back of the bag.

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What does the term MPa mean?

MPa is the metric unit for pressure or stress called megapascal (MPa). The term is used in concrete as the common unit for compressive strength. If you have a project which requires a defined strength of concrete - i.e. 20MPa to set the posts for a raised deck - then its time to call in the experts and have concrete delivered from a ready mixed truck – it’s the only way to guarantee the structural strength in the concrete.

You may also see concrete requirements expressed as 'N20/10' - this is where N means normal class concrete, 20 refers to 20MPa of strength and 10 refers to it containing a maximum aggregate size of 10mm.

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How many days after application can I paint render?

It is important to follow the coating manufacturers’ directions for curing or drying times before painting. 

The surface can generally be painted with water based paints after 14 days.  For oil based paints being applied to a masonry surface, it is necessary to cure the surface for 5 days and then wait for 28 days before applying the paint.

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Does paint need to be removed from a surface before I render it?

Yes. Before any cement based coating or render can be applied correct surface preparation of the substrate is essential. Any paint and residue from other coatings will prevent an effective bond and it is suggested that they be removed.

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Does the temperature of the air on the day affect the use of concrete products?

The ambient temperature can affect the setting times of all types of concrete. If the temperature is less than 10oC, wait until the day becomes warmer and if its over 35oC then postpone the job until it is cooler.

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When is it best to finish mortar joints?

“Pointing”, raking or finishing  mortar joints should occur only once the mortar has become firm to touch.

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How do you cure freshly laid concrete?

It is important to moisten the surface and edges of the slab for up to 7 days. This provides a continuous supply of moisture to provide a better surface quality. Curing occurs to ensure that the hardened surface abrasion is developed and dusting is reduced.

Protection should start as soon as the final surface finish is produced and not the next day. 

This can also be achieved by covering the slab with black plastic. Care should be taken to ensure that covering the slab does not mark the freshly poured concrete. Protection of coloured concrete slabs must be considered. If polythene sheets are in direct contact with the concrete variable colour of the surface due to hydration staining may occur and this is not possible to correct at a later stage. 

Alternatively, mist spray the slab at least twice daily for up to 7 days as it is important that the slab does not dry out before the cement has fully hydrated.

 

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What product is recommended for filling gaps in paving greater than 3mm?

The ready to use Sand & Cement product from our "Just add water" range should be used for gaps greater than 3mm.  You can either sweep it in dry and then use a hose to mist the product or mix it wet and use a trowel to fill the joints.

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What is the right consistency for good quality concrete?

Watch this video clip to see the right consistency for concrete

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How do I mix Concrete Mix?

Watch this video to see how to mix it and the right consistency you need for best results.

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How do I use Rapid Set Concrete to set a post?

Watch this video to see how to use Rapid Set Concrete when setting a post.

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How much water should I add per bag of product?

This depends on the specific product:

  • Concrete products add 2.5 litres of clean water per bag
  • Mortar and Sand & Cement add 3.5 litres of clean water per bag
  • Rapid Set Sand & Cement add 3 litres of water per bag
  • Render It™ and Roof Tile Bedding Mortar add 4 litres of water per bag

Remember - too much water ruins good concrete, mortar and render!

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What is the coverage of one bag of Render It™?

One bag of Render It™ covers 2.5m2 at 5mm thickness.

Ensure that you mix the Render It™ with exactly 4 litres of clean water to achieve a workable mix.  Only mix as much render as you can apply within 30 minutes.  Discard any render not applied within 30 minutes and mix a fresh batch.

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How many ridge or hip tiles does one bag of Roof Tile Bedding Mortar lay?

One bag produces enough mortar to lay 3 linear metres of ridge or hip tiles.

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What is the right consistency for good quality concrete?

Watch this video clip to see the right consistency for concrete

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How do you cure freshly applied render?

Where render has been applied to a masonry surface, to prevent cracking it is vital keep the rendered surface moist for a period of time. Spray the surface with a hose on mist spray 24 hours after the wall is finished and repeat this for 5 days in the early morning and evening.

It is not advised to cure render that has been applied to blueboard or fibre cement sheeting.

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