Kiln dried sand Is very dry fine sand that contains no moisture. The sand is used to fill the joints of block paving and paving slabs. By filling the joints with kiln dried sand you keep the structure of the paving rigid and strong. It also stops the ingress of water & stops the paving from moving and becoming loose.
The sand is dried in a kiln to remove all the water before it is ready to use. The sand is supplied bagged and dry. It is an extremely fine sand that will flow easily into the joints and gaps in block paving and paving slabs.
Why use kiln dried sand with block paving?
Kiln dried sand is used to lock individual paving blocks together. By doing this you stabilize and strengthen the paving block structure.
The sand in between the joints of block paving prevents water from penetrating the paved area and locks the individual pavers together stopping them from moving. If the joints of block paving are left without kiln dried sand, they may sink due to water penetration and the blocks will become loose over time.
It’s crucial after washing block paving that you replace any lost sand once the paving has dried. This is to prevent water ingress into the paving joints. Unless your paving is designed to be permeable. In which case you should not use kiln dried sand but use clean graded stone chippings.
Expect to pay more money for a bag of kiln dried sand than a conventional bag of builders sand. This is because of the cost to dry the sand in a kiln before being bagged.
Find out how much kiln dry sand you need with our calculator.
The amount of dry sand needed to re-sand block paving is dependent on the width of the joints and the depth of the paving type that has been laid.
We are assuming your block paving is a standard 50mm depth of paver. That you are re-applying the kiln dried sand to the joints after the paving has been cleaned. The depth of sand needed to be replaced is between 5 -10mm deep. You are most likely to be able to re-sand an area of between 15 – 30 square meters of paving with a 20-25 kg bag of kiln dried sand.
Alternative names and colors for kiln dried sand
Different businesses use different brand names for the sand you would use for the joints in block paving. A few of the names used would be Silver sand, Silica sand, jointing sand, pavior sand and dry aggregate sand. You can buy the sand in various colours, grey, natural white, buff, silver and yellow. Although it can be difficult to source a particular color of dry sand. An example would be Silver coloured kiln dried sand. This is only supplied by one producer in the whole of the UK to our knowledge.
Manufactures of kiln dried sand
You can buy kiln dried sand from some of the many companies that manufacture kiln dried sand. Many of the larger paving manufactures that supply paving will also produce sand for the paving. Some of these are Marshalls, Tarmac, Hanson and Lafarge. Most DIY stores and online shops will have their own version of dry paving sand you can buy that has been branded with their own name on the bag. Wickes, Jewson, B&Q, SimplyPaving and Homebase do this for their own driveway paving sand they sell in store or online.
How to re-sand block paving using kiln dry sand
- Clean your paving in the usual way. This could be with a power washer. Or one of the other many ways to clean block paving. Be careful not to remove too much sand.
- Allow the block paving to fully dry. This usually takes a few days. The surface and the joints need to be completely dry. The joints between the paving bricks need to be dry to allow the free-flowing of the kiln dried sand into the joints of the paving. If the paving is damp the sand particles will stick to the sides of the paving. This will not fill up the joints between the paviors completely from the bottom.
- As a rough guide you will need between 1 x 20-25 kg bag of kiln dried sand per 15-30 square meters of paving to be re-sanded. This depends on the width & depth of the paving joints.
- Use a soft broom to spread the kiln dried sand across the surface of the paving allowing the sand to flow into the joints of the paving. Remove all excess sand but ensuring that the joints are full to the top of the bricks.
- Finish by cleaning up any excess sand and re-bag the sand to save for any areas you may have missed. Or gets washed away when it rains. Remember to store the left-over sand in a dry place.
That’s it. You’re done!
Protect the loss of kiln dried sand by applying a sealant or sand stabilizer
It may be worth considering applying a sealer to set your paving joint sand hard. Alternativly you could apply a sand stabilizer if you don’t want a sealer applied. Joint stabilizers work by setting the sand hard but will not seal the surface of your paving.
Important We have had a lot of inquiries recently as to whether you could use beach sand as an alternative to kiln dried sand. Well our answer would be not to use beach sand instead of kiln dry sand. This is because beach sand contains a lot of salt. The salt will be released by the sand over time and may lead to your block paving joints getting efflorescence on the surface. efflorescence can become difficult to remove. You could wash the beach sand first you may release all the salts from the sand but there is no guarantee. And it will be making a lot of work for yourself.
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