HETAS chimney lining installation for open fires, wood burning stoves and solid fuel appliances. Flexible stainless steel liner specified to Approved Document J. Smoke leakage test and compliance certificate on every installation.
The majority of pre-war and post-war domestic chimneys in Romford and Havering were built as open fire flues — wide, uninsulated brick or stone channels designed for coal and open combustion. A wood burning stove or solid fuel appliance produces different combustion gases, at lower temperatures and with higher moisture content. An unlined chimney running a modern appliance is typically oversized, prone to condensation, and at risk of tar and acid attack to the masonry.
Approved Document J requires a liner where the existing flue does not meet the specification for the intended appliance. Diameter, condition and the absence of a liner are all grounds for requiring installation before a HETAS compliance certificate can be issued. We assess at survey and specify the correct liner before any work is agreed.
Liner diameter is a building regulation requirement, not a preference. Undersized liners reduce draw and risk flue gas spillage. Oversized liners cause condensation, tar accumulation and poor combustion. The correct diameter is established at pre-installation survey.
| Diameter | Appliance Type | Notes |
|---|---|---|
| 200mm | Open fires — solid fuel (coal, smokeless, wood) | Minimum per Approved Document J for solid fuel open fires |
| 180mm | Open fires — gas appliance | Minimum per Approved Document J for gas effect fires |
| 150mm / 6" | Wood burning stoves — standard outlet | Most common diameter for stoves into existing chimney |
| 130mm / 5" | DEFRA-approved stoves — 5" outlet | Permitted only where appliance has a 5" outlet and DEFRA approval |
The two grades of stainless steel used in domestic chimney liner installation have different operating temperature tolerances. 316L is the standard grade, suitable for wood burning stoves and most solid fuel appliances operating within normal parameters. 904L is a higher temperature grade, used where the appliance manufacturer specifies it or where operating conditions exceed the 316L range. Multi-fuel stoves running smokeless coal and some high-output solid fuel appliances may require 904L. The correct grade is specified at survey and confirmed before installation proceeds.
HETAS chimney lining installation across Romford, Havering and surrounding areas.
Get in touch to discuss your project. Contact us for a survey and quote.