Fire Pit Cooktop Frame for Solo Stove Mesa, Mesa XL, and Solo Stove Accessories Convert Tabletop Fire Pit to Camping Stove. Compatible with All Pots Pans.Replacement for Titan, Campfire Cooking Ring
KEESHA 8'' Fire Pit Mat for Solo Stove Mesa/XL Tabletop Fire Pit, Bamboo Heat Resistant for Solo Stove, Waterproof & Withstand High-Temperature for Table Top Protection
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Use Cumaru hardwood (aka Brazilian Teak or Golden Teak). My internet searching seems to indicate that this wood has a Class A fire rating and is as resistant as concrete to fire.
This link includes a number of results from test data backing this up.
The type of testing that these hardwood decking and siding species were tested for is commonly referred to as ASTM E84-10 "Standard Method of Test for Surface Burning Characteristics of Building Materials". This fire testing standard was established by ASTM International (formerly known as American Society of Testing and Materials). A Class A fire rating using the ASTM test method is the equivalent of a Class A fire rating from the following test methods and agencies:
- ANSI/NFPA No 255 from the American National Standards Institute/National Fire Protection Association
- IBC 8.1 from the International Building Code
- UL 723 from Underwriters Laboratories
In short wood is not the right material for this, I think you should re-think the requirements... coming to the inevitable conclusion that metal is very likely the way to go. Every fire-pit cover I can recall seeing was made from plate steel.
But if I'm reading the following right you already have problems you'll need to address!
a firepit made out of wood.
There's a reason barbecues and so forth are made from metal, brick or concrete, just sayin' ;-)