PVC Guttering

Fascias and Soffits

External Cladding

Internal Cladding

Hygiene Cladding

Underground Drainage

Soil and Waste

Decking

Flooring

Fibre Cement Cladding

Polycarbonate and Acrylic Sheets

Roofing and Glazing Bars

What Is the Invert Level of a Pipe?

Definition: The invert level refers to the level of the bottom inside surface of a drainage pipe or inspection chamber.
Purpose: It is crucial for designing and installing drainage systems to ensure proper flow and alignment.

Usage in Drawings:

Cover Level: Indicates the ground level, measured relative to a fixed benchmark.
Invert Level: Specifies the floor level inside the pipe or chamber.
Invert Depth: Calculated by subtracting the invert level from the cover level.

Example: If the cover level is 100.00 and the invert level is 98.78:

Falls & Gradients in Drainage

Proper pipe gradients ensure efficient water flow and prevent blockages by maintaining a consistent slope.

Pipe Falls

Definition: A fall describes how much a pipe drops vertically relative to its horizontal length.
Purpose: Helps maintain adequate flow rates and prevents solids from settling.

What Is a 1 in 40 Fall?

Explanation: A 1 in 40 fall means the pipe drops 1 unit vertically for every 40 units horizontally.
Example: In a 40-metre pipe run, the vertical drop would be 1 metre.
Gradient Calculation: Gradient = Vertical Fall / Horizontal Length For a 1 in 40 fall: Gradient = 1/40 = 0.025

Invert Levels and Falls in Drainage

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