I need to install a cast iron chimney clean out door into an 8' x 8

For setting a fire or ash door you would normally use a factory mixed refractory cement (fiber reinforced sodium silicate - based fireclay) that would withstand 2000°F + heat. This is the same mortar you would use to set and line the firebricks or repair cracks in a masonry fireplace. It comes as a dry mix or a ready-to-use mix.

Rutland (

) is one of the most prominent manufacturers here in US and in my neck of the woods I'd go to a Tractor Supply store for it, or order online:

  This particular product, <i>Chimney Sweep® Furnace Cement</i> is just what the doctor's ordered, I've highlighted the parts from the manufacturer's description that would be especially of interest to you. Picture attached below.

<q> Chimney Sweep® Furnace Cement is a pre-mixed, heavy bodied, high-temperature silicate cement that resists temperatures to 2700º F. Especially suitable for bonding and sealing metal to metal joints <strong>Makes masonry to metal repairs easy</strong>

Repair or reset furnaces, wood or coal stoves and fireplaces

18 month limited manufacturer's warranty  </q>

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Chimney Manufacturers

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