Two levels of scaffolding are built around the redwood trees in the Woodcutting Guild, allowing players to reach the sections of the tree that can be cut. The first level is accessible via rope ladders at the very bottom, located on the east and west sides of the tree. The second level is accessed via carved entrances, located on the side closest to the other redwood tree. Each side that does not have a carved entrance has 2 sections to chop, totaling to 12 sections per tree and 24 sections overall.
The following chart indicates the success rate of chopping a redwood tree with different types of axes.[1][2]
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There are several mentions of redwood trees by NPCs around Gielinor as well as in books. The following text is transcluded from Gielinor's flora - trees. The information found within the book is more often than not just flavour text, and does not reflect their properties or uses within the game itself.