Block work is primarily measured in square meters (m²), taking into account the actual thickness of the blocks used and other relevant factors. This detailed measurement is essential for accurate cost estimation and project planning.
Here's a breakdown of the key considerations when measuring block work:
- Area Measurement: The face area of the block work is calculated in square meters (m²).
- Thickness: The actual thickness of the blocks must be specified (e.g., 215 mm). This is crucial because different block thicknesses affect material quantities and labor costs.
- Plane: If the block work is not vertical, the plane must be described (e.g., battering or tapering walls).
- Facework: Specify whether one or both sides have a finished face (fair face). This impacts the labor and material costs associated with achieving the desired finish. Fair face generally indicates a higher level of workmanship is required.
Additional Considerations:
- Openings: Deductions for openings such as doors and windows are typically made. The rules for deductions can vary depending on the project specification or standard method of measurement used (e.g., SMM7).
- Reinforcement: The quantity of any reinforcement incorporated within the block work (e.g., steel bars) is measured separately in kilograms (kg) or tonnes (t).
- Mortar: Although not directly part of the m² measurement, the type and quantity of mortar should be specified, as it impacts the overall cost of the block work.
Example:
A measurement might read: "25 m² of 215mm thick concrete block work, vertical, fair face on one side."
In summary, accurate measurement of block work involves careful consideration of area, thickness, orientation, and surface finish. This ensures precise cost estimation and effective project management.
