-
Glass-reinforced liner
— Glass-fibre reinforced CIPP liner for high-strength structural rehabilitation of damaged sewers.
-
Grease blockage (food waste)
— Drain blockage caused by accumulated food waste, fats and detergent residues from kitchens.
-
Greywater system
— System collecting wastewater from baths and basins for reuse in toilet flushing or irrigation.
-
Gully replacement
— Removal and installation of a yard or road gully where the existing unit has failed.
-
Gurgling drain
— Bubbling or glugging noise from a drain or fitting caused by air being drawn through traps.
-
Hair blockage
— Drain blockage caused by hair binding with soap residue inside bath and shower wastes.
-
Hairdressing salon
— Hair and beauty premises with basin chairs, hair clog risk and small commercial drainage.
-
HDPE pipe (high-density polyethylene)
— Tough black plastic pipe used for above ground stacks and adopted sewer rising mains.
-
Health and Safety at Work Act 1974
— Primary UK legislation establishing duties to protect health and safety in work activities.
-
Hemp (plumbing jointing)
— Traditional natural fibre used with linseed paste to seal threaded plumbing joints.
-
High-pressure jetter (HPW)
— Machine that delivers pressurised water through nozzles to clean drains.
-
High-pressure water jetting (hydro-jetting)
— Cleaning method using pressurised water to scour pipe walls and clear blockages.
-
Highway drain survey (s.50)
— Survey of drainage affected by highway works, typically required under section 50 licensing.
-
Homebuyer drain survey
— Standard pre-purchase CCTV drain survey with concise report for homebuyers.
-
Hospital drainage emergency
— NHS or private hospital drainage emergency, with infection control and rapid response priority.
-
Hospital kitchen
— NHS or private hospital catering kitchen with 24/7 drainage demand and infection control.
-
Hot cure lining
— CIPP lining cured by circulating heated water through the inflated liner.
-
Hot water jetter
— Jetter that heats the working water to soften grease and improve cleaning efficiency.
-
Hot-melt sealant
— Bitumen-based jointing compound applied molten to seal manhole covers and chamber rings.
-
Hotel kitchen
— Large commercial kitchen serving guests, with high drainage loads and grease management.
-
Housing association property
— Property owned by a registered housing provider, with association-managed drainage works.
-
Hydraulic test
— Generic term for any test using water under controlled pressure or flow to verify drains.
-
Industrial unit
— Factory or workshop unit with potentially contaminated drainage and trade effluent.
-
Inline check valve
— One-way valve installed in a pipe that allows flow in one direction only.
-
Inspection chamber
— Smaller access point on private drains allowing rodding and CCTV survey from the surface.
-
Insurance claim drain survey
— CCTV drain survey carried out to support a buildings insurance claim involving drainage.
-
Insurance claim drainage report
— Detailed written report supporting drainage-related insurance claim, with CCTV and causation evidence.
-
Insurance dilapidation survey
— Survey assessing drainage condition to support a dilapidations or insurance schedule.
-
Insurance emergency callout
— Emergency drainage callout arranged or approved by buildings insurance under home emergency cover.
-
Insurance preventive maintenance
— Drainage maintenance arranged under insurance terms to prevent claims and reduce premiums.
-
Integrity test
— General test confirming structural and watertight performance of a drain or chamber.
-
Internal flooding emergency
— Emergency response to water or sewage flooding inside a property, requiring rapid intervention.
-
Internal sewer flooding
— Sewage backing up into a property through fixtures or floor gullies, posing health risks.
-
Inversion lining
— Liner installation method using water or air pressure to turn the liner inside out into the pipe.
-
Isolation valve
— Valve allowing a section of pipework to be shut off while the rest of the system stays in use.
-
Joint sealing (drain)
— Internal sealing of leaking pipe joints to stop infiltration or exfiltration.
-
Kitchen sink (single bowl, double bowl)
— Sink installed in a kitchen for washing food and dishes available in one or two bowl formats.
-
Land Drainage Act 1991
— UK legislation governing the management of watercourses by internal drainage boards and councils.
-
Landlord drainage emergency
— Emergency drainage response for rental properties, with landlord notified and works documented.
-
Lateral drain
— Section of drain outside a property boundary serving a single building before the public sewer.
-
Lateral drain survey
— CCTV survey of the lateral drain section between a property boundary and the public sewer.
-
Laundrette
— Self-service or staffed laundry premises with high water use and lint loading.
-
LDPE pipe (low-density polyethylene)
— Flexible low-density polyethylene tubing used in irrigation and minor drainage applications.
-
Lead pipe (legacy)
— Historic lead pipe used for water supply and waste in pre-1970s London property.
-
Leak from waste pipe
— Water leak from a waste pipe joint or split, often discovered as damp staining or drip.
-
Leak under sink
— Water leak beneath a kitchen or bathroom sink from waste pipe, trap or supply connection.
-
Leasehold property
— Property held under a long lease, with shared drainage usually managed by the freeholder.
-
Leaves blockage in drain
— Surface water drain blocked by accumulated leaves and garden debris, particularly in autumn.
-
Lining curing
— Process of hardening a CIPP liner once installed inside a host pipe.
-
Listed building (Grade I, II*, II)
— Building protected under the Planning (Listed Buildings) Act, with restricted drainage works.
