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Industrial unit
— Factory or workshop unit with potentially contaminated drainage and trade effluent.
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Inline check valve
— One-way valve installed in a pipe that allows flow in one direction only.
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Inspection chamber
— Smaller access point on private drains allowing rodding and CCTV survey from the surface.
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Insurance claim drain survey
— CCTV drain survey carried out to support a buildings insurance claim involving drainage.
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Insurance claim drainage report
— Detailed written report supporting drainage-related insurance claim, with CCTV and causation evidence.
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Insurance dilapidation survey
— Survey assessing drainage condition to support a dilapidations or insurance schedule.
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Insurance emergency callout
— Emergency drainage callout arranged or approved by buildings insurance under home emergency cover.
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Insurance preventive maintenance
— Drainage maintenance arranged under insurance terms to prevent claims and reduce premiums.
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Integrity test
— General test confirming structural and watertight performance of a drain or chamber.
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Internal flooding emergency
— Emergency response to water or sewage flooding inside a property, requiring rapid intervention.
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Internal sewer flooding
— Sewage backing up into a property through fixtures or floor gullies, posing health risks.
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Inversion lining
— Liner installation method using water or air pressure to turn the liner inside out into the pipe.
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Isolation valve
— Valve allowing a section of pipework to be shut off while the rest of the system stays in use.
