How to clean block paving

Need to get rid of moss on a roof or wondering how to clean paving slabs before sealing?

Whether you’re a keen DIYer or a building professional, your skills, plus knowing how to get the best from the latest cleaning and disinfecting techniques, are the keys to beautiful results that you’ll be proud of for years – and a delighted customer who’s happy to give you a glowing testimonial. Here are some ideas from the Isonit UK team to help you when you want to clean anything from paving stones to a roof…From experience in the UK and mainland Europe, here are our 7 top tips for a great cleaning job. Some may seem obvious, but you’d be surprised how often they’re overlooked:

1. Preperation matters

Before coating and sealing any surface, thorough preparation really is essential. Without good preliminary work, even the most advanced materials won’t perform to their full potential. That’s why there’s no substitute for using a proven, advanced surface cleaner to safely and effectively dissolve away dirt, dust, encrusted debris and organic matter from paving, facades and roofs.

2. Correct dilution saves money

If you’re a contractor, you probably know how to clean a block paved driveway with a lance, how to use a roof-cleaning box to avoid tile damage at height and how to clean exterior brickwork. Thorough disinfection, before and after cleaning, is also vital – using suitably diluted proprietary cleaner-disinfectant (professional cleaners usually come concentrated for dilution with between 20 and 50 parts of water to one part concentrate). As well as ensuring optimum cleaning, correct dilution makes sure that you get the maximum volume of cleaning solution from a given amount of product – and don’t throw money away!

3. Apply cleaners in advance

When applying a cleaner-disinfectant such as ISO A-Clean to surfaces that are badly affected by algae, moss or lichen, timing matters. Follow manufacturers’ recommendations, but as a general rule, initial application, with a low-pressure hand sprayer or a suitable power sprayer, 2–3 days before cleaning makes subsequent power cleaning easier. And remember to thoroughly clean-disinfect the edges of roofs too.

4. Disinfect before and after cleaning

After jet-washing or scrubbing, another application of disinfectant-cleaner helps maximise the benefit of your hard work and keep new growth away for as long as possible – whether or not the surface is due to be sealed. For best performance, make sure the surface is dry before application.

5. Avoid over-application

Knowing how to clean paving stones or roof tiles is one thing, but please avoid the temptation to over-apply disinfectant-cleaner. With most professional cleaners, you should avoid excessive runoff. And of course, never allow cleaner-disinfectant to enter watercourses and other aquatic environments.

6. Dry thoroughly

Allow the cleaner-disinfectant to dry thoroughly before further coating with colouring or sealant.

7. Good materials matter

No matter how thoroughly you prepare, clean, disinfect and coat surfaces, the quality of your work, frost-proofing and retaining a great appearance for years will only be as good as the materials you use.

Is the job a simple garden spring clean or part of a major industrial refurbishment? For a long-lasting job you’ll be proud of, and your customer will be pleased to show off, choose only high-quality, ‘self-cleaning’, products from suppliers with long experience developing, testing and supplying these specialist materials. Done right, with the latest nanotechnology cleaners and sealants, you really can look forward to your paving staying clean well into the future.