Boil kettle aluminium heat diffuser - how tgick

[jhsbaker]

Hi, I am planning to get an aluminium plate made to place under my stainless steel boil kettle (2mm thick). Can anybody advise thickness of aluminium I should go for?

 

[MHB]

unless it is bonded onto the kettle it probably wont help much, if you are using gas, I would look for a piece of stainless mesh or choose a burner that didn't put all the heat in one place.
Mark