Change size thermoash & drying-swelling cycles. Questions.

[SchraubenMeister]

Hello!

Please help with finding information.

I want to make a kitchen table. I will handle food (meat, vegetables, bread, etc. ) on the tabletop. There will be a lot of moisture.
Tabletop will be out of thermoash (392- 410F / 200-210C). A three-layer oil coating is planned for additional protection.

But I have no answers to some questions.
Residual humidity in wood is not guaranteed by my supplier. This is a problem in my location. 
Thermowood is dead wood. Such wood has different properties. 
But I can't find exact information on how to resize such dead wood.

Clarifying questions:
Is there any need to calculate drying-swelling for thermoash?
In what range can the tabletop resize?
How much to change sizes A and B (look drawing)?
Thermoash warping maybe? How much inches (mm) my tabletop can deform?

 

I want to make a simpler table design. Resizing information is needed to create a correct fix & endurance design. 
But there is no information anywhere.
Many thanks for all useful answers!

Edited April 20, 2021 by SchraubenMeister

[Woodworks]

Looking at this page suggests you dont need to be worrying about moisture expansion and warping with such low moisture content. 2-4% is so slight I cant imagine any movement of consequence will occur.

 

Interesting product. Saw some in Lathams many years ago but not seen it since 

Brimstone Ash - Vastern

WWW.VASTERN.CO.UK

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Produced from ash, the most prolific white wood in our mixed woodlands, Brimstone Ash is the most popular item in the range.

 

[SchraubenMeister]

Thank you!

 

Purchased countertop (pic).There was moisture and heat from the kitchen stove. 1 month of operation. Untreated wood. Can this happen to a thermowood?