Refractory Cement Chimney Liner

Metal chimney liners usually of stainless steel or aluminum are primarily used to upgrade and repair existing chimneys.

Refractory cement chimney liner.

Non water soluble refractory mortar this type of refractory mortar is a blend of aggregates and binders that are not only high temperature resistant but also are acid resistant. It surpasses both national fire prevention association nfpa and international residential code irc which require only a medium duty refractory mortar for use in fireplaces and chimneys. Once the cement hardens the bladders are deflated the formwork is removed and any necessary finish work is performed. It is an approved all fuel chimney liner and listed to ul 1777 by warnock hersey with the addition of the cecure sleeve.

When applied it creates a durable airtight seal that will not shrink or pull away and is permanent and non porous. It is specially designed gray colored refractory cement that is non water soluble after drying. Section 7 2 10 2 of nfpa 211 states that clay flue liners must be imbedded in a non water soluble calcium aluminate refractory cement mixture flue goo ii is such a mixture. At this point they pump a mud like mixture of lightweight refractory cement and insulating aggregate is into the chimney until it fills to the chimney top.

If properly installed and maintained metal chimney liners are extremely safe and durable stainless steel is suitable for wood burning gas or oil appliances while the aluminum is an inexpensive alternative for certain medium efficiency gas applications only.