Quick answer. An R4 rating doesn't make a mortar the universal fix for every bit of spalling.
What to understand before hiring someone
Concrete can deteriorate through corrosion, carbonation, water or impact. The substrate must be studied to determine whether it's a non-structural repair or work that requires calculations and a project.
What to check in the building
Before applying a mortar, it's important to remove damaged material properly, treat reinforcement where needed, respect preparation, thickness and curing, and check compatibility with protective products.
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
Ask for the technical data sheet and application specification. The product brand doesn't replace an assessment of the substrate or quality control during the work.
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 R4 used on all balconies?
No; the repair system is determined by the diagnosis and the function of the element.
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.