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[JoeGrilling]

Another grill design question.  The internal walls on an insulated pellet grill can have more than a 500 deg F temperature swing if cooking at high temperature like close to 600 deg F.  For mild steel, my guess is that the expansion for 500 deg F could be over 1/8".  What do other insulated grill manufactures do for expansion?  I read some grills use high temperature RTV.  Could this be for expansion gaps?  What are you guys that own insualted grills seeing on your grills?     

[Canadian John]

 If you consider double walled insulated, the walls are riveted in my Pro. The only thing I have noticed relative to expansion is one pop during warm-up. Only happens once and not when cooling down. One of the panels(inner front)has a slight bow to it.It is by design..Bowing may be a good way to deal w/ expansion.