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Glass Below New Concrete: Investigate the Runoff Source Before Recleaning
Repeated marks on glazing below construction materials should prompt a review of the runoff source. Cleaning the pane without addressing continuing exposure can leave the same problem returning and may encourage increasingly aggressive treatment.
Updated · NANOLAB Knowledge
The key distinction
Pilkington identifies alkaline runoff from concrete or masonry as a possible source of glass attack. That does not mean every streak below a building feature is permanent damage, but it makes the exposure history relevant. The glazing and construction teams should help distinguish removable deposits from a changed surface and determine the appropriate response.
Practical checks
- Record where the runoff begins, which panes are affected and whether the pattern follows rainfall or construction activity.
- Preserve photographs and product information for the glazing supplier's review.
- Use only the approved cleaning assessment and coordinate any source-control work before considering a protective surface treatment.
Example
Illustrative example: a pane is cleaned repeatedly while water continues to drain from unfinished masonry above it. The recurring streak pattern points to a continuing exposure that a one-off cleaning visit does not solve. The next decision concerns both the source and the glass condition.
Scope and limits
Do not neutralize unknown deposits with improvised chemicals or scrape the glass based on appearance alone. A nano coating should not be sold as a substitute for resolving construction runoff or repairing damaged glazing. Obtain material-specific advice for the affected installation.
Related guidance
- Glass-Cleaner Runoff on Nano-Coated Metal: Confirm Both Surface Methods
- Planning Nano Coating for Interior Glass Partitions
- Patterns in Toughened Glass: Check for Anisotropy Before Blaming a Coating
- Glass Care After Nearby Welding: Separate Deposits from Embedded Damage
Technical references: Pilkington durability of glass. These sources describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.
Discuss the intended surface with NANOLAB. Use the current product documentation for formulation-specific instructions.