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.
Answer from Steven on Stack ExchangeThe 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
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finishing - Need a fireproof/weatherproof solution for fire pit table top - Woodworking Stack Exchange
Wood fire pit cover
Best way to make a fire pit lid for this long rectangular fire pit?
in search of quality fire pit
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' ;-)
Hey all… I am a hobbyist woodworker and made this piece for a very nice lady I met off Facebook marketplace. She wanted a huge firepit cover to give to her son for Christmas.
The wood is Doug fir shaved down to an inch and a half thick and paneled. The wood is from a local mill and kiln dried to 12% moisture. I used titebond 3 to glue it all together and dowels between the layers to keep them all secured. This firepit cover is huge. It’s almost 48 inches round, it was custom made to cover her son’s pit.
After cutting and sanding, I used 3 heavy coats of varathane spar urethane ( the one with UV protection) I love this stuff and have it on all my outdoor furniture.
5 months later I got these pictures showing significant warping. I have the same finishes used on benches older than this firepit cover and they haven’t moved at all.
It’s always heartbreaking when a issue like this happens because I really put my heart into my work… it’s only happened once to me in the past were I had someone take one of my woodworking projects and accidentally run over it.
My question to you guys is this… have you ever see. A cover bend due to the sun alone? Or is it more likely to have been set over a warm bed of coals warping it… Thanks
