Quick answer. Systems applied over existing paving can work, but they're not an automatic solution for every terrace.
What to understand before hiring someone
First you need to know how well the tiles are bonded, the condition of the joints, the height available at doors, the falls, the drains and whether water is trapped under existing layers.
What to check in the building
If the substrate is unstable or the fall is insufficient, applying a membrane on top can shift the problem elsewhere or cause early failure. Vertical upstands deserve special attention.
Don't put yourself at risk of falling or handle unstable elements to take a photo: checks at height require proper equipment. If there is an immediate risk to people, protecting the area and calling the relevant services must come first.
How to make an informed decision
Compare alternatives using the data sheet, preparation, thickness and maintenance. Ask what happens at thresholds, drains and movement joints.
It's useful to keep dated photos, previous reports and itemised quotes. These documents help compare diagnoses and identify which part is a temporary repair and which is a full job. Where there is structural damage, asbestos or other regulated conditions, an authorised professional, company and procedure are required.
Common mistakes to avoid
- Choosing on the final price without checking that the line items are equivalent.
- Mistaking a visible stain or crack for the whole cause.
- Ordering cosmetic finishes before fixing active leaks.
- Assuming that rope access, scaffolding or one product works for every job.
Common questions
Is it always cheaper without demolition?
No, it depends on the diagnosis and the required service life.
When do I need a professional inspection?
When the problem comes back, affects safety, involves several homes or its source is unknown. The recommendations in a guide don't replace a check of the actual work.
Related solutions and reading
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This guide is for guidance only and does not replace an inspection of the property or reports by qualified technicians.