How Do You Test the Moisture Content of Firewood? Moisture Content Explained wet basis vs dry basis
The Air Quality (Domestic Solid Fuels Standards) (England) Regulations stop small quantities (under 2 cubic metres) of firewood from being supplied where the moisture content is above 20%.
For more information please go to the Woodsure website.
The moisture content of a piece of wood is defined in two ways:
Wet basis which is a measure of the water in a log, expressed as the weight of water as a percentage of the wet/unseasoned log. (i.e. wood and water) Dry basis which is a measure of the water in a log, expressed as the weight of water as a percentage of the completely dry log. (i.e. just the wood)
Firewood is measured on a wet basis and although the new law does not mention what basis is used it is relating to fuel so it can be assumed the moisture content should be 20% wet basis.