What Is Eldfast Chimney Lining?

ELDFAST is a wholly ceramic material composed of two elements: a refractory ceramic aggregate in powder form and a resin bonding agent that together create a "slurry" with adhesive properties when applied under pressure.


Traditionally, only materials containing water, lime / clay mortar or cement have been available to re - parge a flue internally, these materials are now known to be prone to acid attack and deterioration.

Clay Pot Flue before and after Elfast Chimney lining

Eldfast is an in - situ applied lining, drawn through the flue by means of a "plug", leaving a 4 mm nominal thickness of material on the flue face. Eldfast will follow the contours of the flue (although some rounding of corners is likely), rather than drastically reduce the free area, this is of particular benefit when wishing to retain future usefulness of the fireplace for open fires (requiring a minimum 8 inch / 200mm cross sectional area) or when dealing with smaller flue areas initially. Eldfast is designed to be installed without the need to break into the flue externally, this is due to the "plug drawn" method of installation. Many other in - situ systems specifically require brickwork to be removed at regular intervals to centralise " formers" and enable lining around bends in the flue. Due to the ceramic nature of the Eldfast, your chimney will gain certain advantageous properties following lining with the material:


As the refactory aggregate does not easily let heat permeate though, it acts as an insulator, keeping the temperature of the gasses passing through at a higher level and therefore reducing the likelihood of condensates within (try to imaginespace shuttle tiles inside your chimney!!). This may also have some useful applications for thatch property owners, where the temperature at the point of intersection for flue and thatch can be considerably lowered from that achieved through only the brickwork.


Also as the material fills over jointing and missing parging within the flue providing a gastight surface, this surface will then dramaticaly improve updraught as a consequence of its smoother gas passage.