Skip to content
Request a ToolBrowse all tools
Home / Formulas / ThermoWood Formulas
21 Formulas

ThermoWood Formulas

Thermal modification, mass loss and durability equations.

Cladding Coverage Calculator

Open the Cladding Coverage Calculator →
Cladding Coverage Calculator
Net area = (Wall width x height) - Openings
Used in Cladding Coverage Calculator
Cladding Coverage Calculator
Linear m per m2 = 1000 / Effective cover width (mm)
Used in Cladding Coverage Calculator
Cladding Coverage Calculator
Total linear = Net area x Linear per m2 x (1 + waste%)
Used in Cladding Coverage Calculator
Cladding Coverage Calculator
Boards = ceil(Total linear / Board length)
Used in Cladding Coverage Calculator
Cladding Coverage Calculator
Courses = ceil(Wall height / Effective cover)
Used in Cladding Coverage Calculator

Durability Classifier

Open the Durability Classifier →
EN 350
Durability Class 1 (Very Durable) to Class 5 (Not Durable)
Used in Durability Classifier
EN 335
Use Class UC1 (dry interior) to UC5 (marine)
Used in Durability Classifier
Durability Classifier
Service life ~ base_life(class) x use_factor x climate_factor
Used in Durability Classifier
Durability Classifier
Sapwood is rated Class 5 for almost all species
Used in Durability Classifier
Durability Classifier
Treatment can upgrade effective class by 1-3 levels
Used in Durability Classifier

ThermoWood Mass Loss Calculator

Open the ThermoWood Mass Loss Calculator →
ThermoWood Mass Loss Calculator
Mass loss % ~ f(temperature, duration, wood type)
Used in ThermoWood Mass Loss Calculator
ThermoWood Mass Loss Calculator
ML = base(T) x duration_factor x type_factor
Used in ThermoWood Mass Loss Calculator
Thermo-S class
~180-200 C, mass loss 3-7%
Used in ThermoWood Mass Loss Calculator
Thermo-D class
~210-230 C, mass loss 7-15%
Used in ThermoWood Mass Loss Calculator
ThermoWood Mass Loss Calculator
EMC reduction ~ proportional to mass loss (up to ~50% lower)
Used in ThermoWood Mass Loss Calculator
ThermoWood Mass Loss Calculator
Durability improves from class 4-5 toward class 1-2 (EN 350)
Used in ThermoWood Mass Loss Calculator

Decking Gap Calculator

Open the Decking Gap Calculator →
Decking Gap Calculator
Coverage per unit = Board width + Gap
Used in Decking Gap Calculator
Decking Gap Calculator
Board rows = ceil((Deck width + Gap) / Coverage per unit)
Used in Decking Gap Calculator
Decking Gap Calculator
Boards per row = ceil(Deck length / Board length)
Used in Decking Gap Calculator
Decking Gap Calculator
Total boards = Rows x Boards per row
Used in Decking Gap Calculator
Decking Gap Calculator
Actual coverage = (Rows x Board width) + ((Rows-1) x Gap)
Used in Decking Gap Calculator

Use these formulas

Mass Loss CalculatorDurability ClassifierDecking Gap CalculatorCladding Coverage CalculatorThermoWood Species ReferenceWhat is ThermoWood?

Common questions

Where do these formulas come from?

Every formula on this page comes from a published source — standards, handbooks or long-established trade rules for thermally modified wood. The source is named next to each formula. Nothing here is invented by us.

Can I use these formulas in my own spreadsheets or software?

Yes. The formulas themselves are public knowledge and free to use anywhere. If our page helped you, a link back is appreciated but not required.

Are the calculators on this site using these exact formulas?

Yes. Each calculator runs the formula shown here, and automated tests check the results against worked examples from the original sources before anything goes live.