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America's #1 Brand of DIY Outdoor Pizza Ovens!

High-Temperature Insulating Castable Refractory

Minimum Purchase:
2 unit(s)

Product Description

Ideal for insulating under the hearth firebrick (the cooking surface) in bread and pizza ovens!


  • Replaces Vermiculite or Perlite in your oven base.
  • Castable weighs approximately 35lbs per cubic foot and is shipped in a 50lb bag.
  • For estimating purposes, approximately 3lbs will cover one square foot, one inch thick.
  • Add approximately six gallons of clean water per bag and mix thoroughly. No other additives required.
  • May be cast or troweled into place.
  • Possesses cold crushing strength of approximately 200lbs per square inch.
  • Apply at a minimum 2 – 3 inches thick.
  • This product is Non-Water Soluble in service (under cooking surface firebrick).

This is a higher-end insulating castable which is a replacement to the lower-cost Vermiculite / Perlite : Portland Cement blend.


FedEx &/or Freight Delivery is included in the price.