Every chimney that lacks a masonry liner or has a cracked liner, that has loose mortar joints or damaged brickwork, or shows signs of creosote staining can be viewed as a potential fire hazard. A new refractory concrete lining of the proper size can provide a smooth, seamless acid-resistant flue surface to remedy many of the problems cited.
HOW THE LINING IS MADE
The process begins with a complete chimney sweep. This provides a solid base for the new lining. One or more inflatable rubberized tubes are inserted so that they project from both the top and bottom of the chimney. Stainless steel spacer springs are placed around the tube form so that the flue will be centered in the void. Then the tube is inflated to create the properly sized opening for the flue. A special concrete mix is pumped into the void around the form. After overnight curing, the void tube is deflated and pulled out, leaving a smooth hard-finished lining properly sized for stoves or other equipment.
The system uses a mortar mixer and squeeze-type pump to deliver concrete to the void between the chimney walls and the inflated flue form.
THE REFRACTORY MIX
The lining system uses a prepackaged refractory mix of perlite, cement, and admixtures that can withstand the 2,100 degree Fahrenheit temperatures that may exist in a chimney.