Species guide
Sessile and English Oak: what the numbers tell you.
What one study can tell you about two European oaks.
Direct answer
A 2025 study found Sessile Oak denser than English Oak in its test trees. It did not list a Janka number. It did not test a finished floor in a home.
See the wood, then read the numbers
A photo can show character. It cannot prove the species.
Use the measured record below to compare the named wood. Then compare real samples in the room where the floor will live.
How to read these figures
These are two different oak types. The study measured trees in Czech plots. It is not a product study.
Sources & methodology Peer-reviewed measurements and study context
These figures come from clear-wood laboratory data in the cited peer-reviewed study. They help you compare species; your own floor’s construction, finish history, and condition still matter.
| Metric | Reported value | Context |
|---|---|---|
| Sessile Oak density at 1.3 m, 12% MC | 721 kg/m³ | Mature-tree Czech-plot study value. |
| English Oak density at 1.3 m, 12% MC | 662 kg/m³ | Mature-tree Czech-plot study value. |
| Crown-base density | 710 Sessile / 701 English kg/m³ | The paper describes this interspecific difference as statistically nonsignificant. |
| Janka hardness | Not reported | Density cannot be used to estimate or substitute for hardness. |
Reviewed October 6, 2026. The paper measures clear wood in a lab. At your visit, we look at the real floor, room, and project plan.