SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/wood-end-grain-porous

Compared with the side of a board, how porous is end grain?

About 100 times more porous.

Start playing free

  1. About twice as porous
  2. About 100 times more porous ✔
  3. About the same

Why: End grain exposes the open ends of the wood's tiny tubes, so it drinks stain and finish like a straw. That is why end grain turns darker and needs sealing or a lighter coat.

Huh, didn't know that: Water also soaks into wood fastest through the end grain.

The dad joke
What do you give to a thirsty tree? Lemon-aid.
Like this card?
Play the game

References

Answer: About 100 times more porous. End grain exposes the open ends of the wood's tiny tubes, so it drinks stain and finish like a straw. That is why end grain turns darker and needs sealing or a lighter coat.

  1. Wood Handbook: Wood as an Engineering Material, FPL-GTR-282 (USDA Forest Products Laboratory, 2021) research.fs.usda.gov/treesearch/62200
    The end grain of wood is commonly 100 times more porous than the side of a piece of wood
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Trades & ShopWhat does finishing every face of a board, including the end grain, tend to do?Trades & ShopWhat is a safe way to handle oily finishing rags, per Woodcraft?Trades & ShopWith ordinary glue, an end-grain butt joint reaches about what share of the wood's tensile strength?

That's stuff everyone should know.