How much weight can go in a kiln?

strict warning: Only variables should be passed by reference in /home/hotkilns/public_html/sites/all/modules/captcha/ on line 61.

Search Knowledgebase

Knowledgebase FAQ

  • See the Sales FAQs for Frequently Asked Sales and Preorder Questions
  • The Knowledgebase is organized into a series of questions and answers having to do mostly with technical troubleshooting and understanding of kilns.
  • Although we write this for our own kilns many of these articles apply to other makes - although L&L takes no responsibility for that.
  • Many Knowledgebase articles have Actions, PDFs and Videos associated with them.
  • Actions are specific actions for you to take during the troubleshooting or repair process.
  • Each Action may also have Videos and PDFs associated with it and, in addition, specific Cautions.
How much weight can go in a kiln?

Although this is not something that we have specifically tested for, the general answer is about 50 to 75 pounds per square foot of bottom surface area.

For an Easy-Fire, Jupiter, Doll, Chameleon, Dura-Fire, etc., figure 50 pounds per square foot of bottom surface area.

For a DaVinci figure 75 pounds per square foot of bottom surface area.

The other factor is that the brick is mostly non-compressible as long as the load is spread out evenly. I would recommend that your customer put a hearth plate right on the bottom of the kiln on top of the firebrick to spread out any weight.

Additional Actions to Take

  1. If uneven firing occurs persistently, distribute your load weight more evenly throughout the kiln or to match the firing characteristics of the kiln.
  2. If elements typically fire hot at the top of the kiln put more weight in the top to absorb that heat, and vice versa.
  3. The bottom shelf should be at least 1/2" to 1" above the floor of the kiln.
  4. Badly distributed load weight can also affect the firing rate of the kiln and lead to Error 1.

TIP: The longer square posts can be laid down on their sides to get a perfect amount of space under the bottom shelf.