Specialists in Block Paving Surface Sealing & Sand Stabilisation
Our experience in block paving sand stabilisation and surface sealing techniques will maximise the sealants performance, preserving the life of your block paving by protecting the colour and the surface from wearing and absorbing dirt and restricting the growth of organic matter (algae and black spot). It also stabilises the jointing sand, setting it solid to a depth of approx. 20mm stopping weeds, ants nests and inhibiting the growth of moss and greatly reducing ongoing maintenance.
Block paving is very popular, hard-wearing and very appealing on the eye, also one of the hardest surfaces to maintain, due to each block being surrounded by sand, which is the perfect growing environment for vegetation/weeds and the perfect dampness for moss to flourish on. As you probably already know ants love sand, all paving is porous so allows algae and dirt to easily build up, using a quality block paving sealer will help to alleviate these issues by stabilising the jointing sand between the blocks setting it solid, and sealing the surface.
The most popular sealants in the UK are Acrylics as they are more affordable than Urethanes; however, they do require re-applying every 2- 3 years to retain their properties. Whereas Urethane sealants can last up to 10 years keeping the sand solid in-between the block paving, but can cost up to three times as much.
Once an area is sealed, it can become one flexible unit (Polyurethane) and be extremely strong and watertight. It prevents the sub-base sand eroding from heavy rain and jointing sand loss from pressure washing, which can weaken the integrity of the paving. Other positives are that weeds are kept under control, moss is reduced, and it also helps to protect against ants undermining the sub-base, which can result in the collapsing of small areas.
Sealing the surface of block paving & stabilising the jointing sand, should not be treated the same
The difference between sealing the surface of block paving & stabilising the jointing sand in-between the blocks, stopping weeds, ant’s nests and reducing moss require different techniques of application.
The coverage ratio just to seal the surface of block paving could be as much as 5-7 sqm per 1 litre of sealer, depending on the porosity of the blocks the application method which can be carried out with a roller or sprayer. You will have good surface protection against algae, grime, black spot, oil & absorption. However, the sealant will only have penetrated approx. 3 – 5mm deep of the jointing sand and in a short period of time, the sealer over the joints will crack and the jointing sand may even break up in chunks, and you will then see weeds re-establishing.
So, if weeds are your main concern, it is best to stabilise the freshly brushed in new kiln dried jointing sand, to accomplish this the coverage ratio for normal block paving with gaps of approx. 1 – 5mm at 1.8sqm per 1 litre of sealer & for big blocks with gaps of approx. 5 – 10mm, at 1.5 sqm per 1 litre of sealer. This should be carried out with a rose head watering can and squeegee removing the excess off the surface saturating the jointing sand and penetrating it to approx. 15-20mm deep. This will maximise the protection against weeds, ant nests and moss and the added benefit the jointing sand that is now set solid to a depth off 15 – 20mm. It will not be affected with pressure washing on future cleans, making it easy to maintain (it is far easier to clean a solid surface than chasing out weeds and loose sand then having to repeat the sealing process when sealant is incorrectly installed for block paving).
One more important piece of technical information you must bear in mind is other than a solvent based Acrylic, which can be over-sealed at any point, it is not advised to over-seal on top of unworn water based or Polyurethane sealers. It is possible that it will not adhere to the existing sealer and even if it does adhere you may be getting to the point of over-coating, which can cause uneven wearing and possibly turn your driveway silvery in colour. So, it is advised to correctly stabilise the jointing sand on the first attempt.
Summary: In our opinion it is far more important to stabilise the jointing sand to 15-20mm, than it is to seal the surface of block paving.
Time Lapse Video of Acrylic Sealing
Time Lapse Video of Sand Stabiliser Sealing
Time Lapse Video of Polyurethane Sealing
Sealing your patio with the correct sealant for the particular surface will keep your paving cleaner for longer, placing a barrier on the surface from absorbing dirt, and restricting the growth of organic matter (algae and black spot).
With a choice of a natural or a colour enhanced finish as shown in these images on the left.
Re-colour your tarmac in black or red, renewing the look of your driveway, whilst sealing the surface and protecting the tarmac.
Post Winter Wash
Once we install the sealant & stabilise the jointing sand, you will qualify for our post winter wash each year at 40% off the original cleaning price so your surface will always remain clean, and keep the sealant in optimum condition.
Maintenance Advice Following your Sealant Installation from PaveShield Products
Block Paving Sealers are designed to help minimise maintenance for homeowners, however with all paving products, some degree of routine maintenance is necessary to prevent build-up of stains, traffic film, lichen, algae and sediment from rain.
To help keep the sealer and surface in optimum condition, in early Spring each year after the long damp winter, we recommend a treatment of our PaveShield Products Liquid Shock Moss and Algae Killer to minimise moss or algae growth in areas at risk, such as north facing and shady areas, underneath hanging baskets, adjacent to borders or overhanging trees. Alternatively apply PaveShield Products Traffic Film Remover to the whole surface and wash down thoroughly, to remove fuel pollutant and any organic growth or debris.
PaveShield Products Block Paving Sealer is designed to be re-applied at any time if the paving is clean and dry. This allows areas of high wear to be re-treated if required.
Any spillages of oil-based products should be removed as soon as possible with a biological degreaser to avoid and dry stains forming.
Sand joints that are disturbed by heavy trafficking (in most cases at the front of the driveway), can be made good if the paving is clean and dry. This can be done by removing any loose or broken jointing sand, then re-apply kiln dried sand and PaveShield Products Block Paving Sealer in small quantities to the joints, then wiping the surplus off the surface.