Looking after your block paving

Initial cleaning

After paving has been allowed to settle for a few weeks, you may wish to hose down to remove any excess dirt or sand. Make sure to leave it dry off first before attempting to brush sand back into the joints.

Block paving sealer

Your new block paving can have a paving sealant applied which helps to combat staining and weed growth whilst enhancing colour and appearance. Acrylic style sealers can be sprayed and can form sealed skins to the top of the area ensuring an easily maintained finish. Areas must be free from stains or dirt before sealer is applied. We recommend waiting a couple of months before using any sealer. Call us for advice before you undertake this task.

General dirt

Regular sweeping is recommended to maintain appearance. Medium pressure hosing should remover general dirt and grime. After power washing, sweep jointing sand between the joints of the paving. Before any cleaning begins, a trial area needs to be tested. For advice on cleaning products call us.

Moss and Algae

General cleaning of algae or dirt requires brushing using a generous solution of hot water and washing up liquid, cleaning it off with lots of clean water. Shaded areas may require repeated treatments. Heavy growth of moss or lichen may need to be removed by first applying paving cleaner, feel free to call us if you need any help with choosing one. Best applied to a dry paving surface, the solution can take several days to take full effect. The dead material can then easily be brushed off.

Having your paving area sealed can stop the growth of weeds, grass, algae. It can also enhance the colour, reduces surface porosity and is a lot easier to maintain in the future.


Areas with traffic will have have very little or no weed growth as it prevents weeds from rooting up. Regularly brushing the area will take care of most surface weed invasions that can occur from mowing grass and the seeds settling on top of the paving.

Weeds can be treated using a recommended weed killer solution from garden centres or merchants. Areas to be treated should have larger weeds removed by hand before applying the solution.


This is the appearance of unsightly white deposits or stains of the surface of the paving blocks. This is neither a manufacturing defect, materials defect nor an installation fault, but a natural occurring phenomenon in the concrete caused by calcium hydroxide (lime deposits) reacting with carbon dioxide in the air. It may seem to disappear when the paving is wet, but the efflorescence salts temporarily vanishes but will return again when the paving dries.

Be reassured, efflorescence has no detrimental effect on the paving and will generally disappear with time. Depending on climate conditions and location, it can take 6 months to two years to disappear. Once it does disappear naturally it usually does not reoccur.

If it is really bothering you, to improve the appearance short time, you can use a efflorescence remover but be sure to call us first as we can give some advice on it.


If you have any more questions or need more information on paving, cobblestones, indian sandstone or slabbing please feel free to get in touch 7 days a week.

JC Contractors, Your local Dublin Paving Contractor.