Strength
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We build a super-strong arch from 4-1/2" thick special arched-shaped K25 firebricks (which are stronger than the standard K23 bricks).
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This is the time-proven way to design a front-loading kiln.
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You can't prevent a roof in a kiln from cracking but an arched roof will prevent a roof from collapsing.
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The end result is that these kilns will last years longer than kilns that utilize flat roofs.
Insulation Quality
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In addition to the 4-1/2" of K25 firebricks, an additional 2" of non-RCF fiber blanket insulation is used on top of the arch.
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This makes for an extremely well-insulated top where much of the heat loss is.