Guardian was developed by chimney restoration professionals with more than 30 years combined experience. Our team set out to create the safest, most advanced chimney lining system available. The result is the unequalled protection of the Guardian Chimney Liner®. No other chimney lining material offers the level of protection provided by the Guardian Chimney Liner®. The only chimney liner tested and listed to the UL 1777 standard at 3/4" liner thickness for zero clearance, the Guardian Chimney Liner® provides maximum protection for your home and family. Poured and solidified within an existing chimney structure, the Guardian Chimney Liner® permanently restores the structure, even the critical smoke chamber component of a fireplace, without altering the appearance or historical integrity. The configuration and high insulating properties of the Guardian Chimney Liner® normally improves fireplace or appliance performance and is suitable for all fuels. The Guardian Chimney Liner® is suitable for all heating appliances and nearly all chimney structures. The Guardian system is also ideal for creating multiple flues in a single large chimney space, so multiple appliances can be vented safely within the same chimney. Cast-in-place chimney liners are recognized by architects, engineers, and the insurance industry, as the preferred method for chimney repair. The Guardian Chimney Liner® is simply the best cast-in-place liner available today. The Guardian Chimney Liner® is backed by a lifetime guarantee. Please see your chimney restoration professional, or contact us for details.