Bonding a Calcium Silicate Board

[ultrasport]

I want to adhere my calicium silicate board to a cured vermiculite/mortar base .What would be the best sealant to use. I want the calcium board to stay put while I bed down the firebrick floor.

[rwiegand]

Boy, I fount it to be heavy enough that it had no inclination to go anywhere. A little mortar should stick it down though.