Safety-Critical Fixings: When Does Building Control Demand Certified Pull-Out Testing?
A request for a certified pull-out test is common on London construction projects. What is much less common is a clear explanation of what test is…
Visual Indicators of Structural Spalling and Carbonation in Concrete Elements
Concrete spalling is easy to see. The reason it happened is often much harder to establish. A broken soffit exposing reinforcement, a longitudinal …
Mapping Crack Patterns: Interpreting Structural Movement Through Visual Inspection
A crack is not a diagnosis. It is a visible response to stress, strain, movement, deterioration or material behaviour somewhere within a structure.…
Visual Structural Condition Surveys: The First Line of Defence in Asset Management
A visual structural condition survey is often the first engineering step in understanding the condition of an existing building or structure. Befo…
Ultimate vs. Working Loads: Navigating CFA Guidelines for Post-Installed Anchors
An anchor reaching 30kN at failure does not have a 30kN working load . The number recorded when an anchor finally pulls out, breaks or causes the s…
The Engineer’s Guide to BS 8539: Proof Testing vs. Allowable Load Verification
A request to pull test the anchors to 10kN may sound clear on a construction site, but under BS 8539 it is not enough information to define a tec…