Confirmation of the conventional surface number for the face being inspected or treated within a monolithic, laminated, or insulating glass construction.
GlassRenu · Educational illustration
Meaning and boundaries
Surface numbers describe position within the assembly, not coating chemistry, accessibility, or whether abrasive restoration is permitted.
Why it matters in glass restoration
The same coating or damage on surface 1, 2, 3, or 4 can have different exposure, replacement, appearance, and treatment implications.