* learn the proper use of slip to carefully bond clay
I made a chimney flue port by bonding fibre insulation to the flue liner with a homemade refractory cement (50 percent mullite and 50 percent Hawthorne bond clay
) and then placed roof flashing around the fibre-cemented wrap, riveted the flashing into place and secured it for potential cracking using large hose clamps.
Consequently, the interlayer cations that can help bond clay
layers together are not held as tightly as with illite and vermiculite.