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How to calculate the maximum size of the gable overhang?

How to correctly calculate the maximum size of the gable overhang, depending on the total area of boards + osb -12mm?

There is an opinion that it should be up to 60cm.

But if you add boards to the crate, up to a solid flooring in the gable and add OSB on top, then the idea of strength increases.

Some information about my house. Walls, gables of brick, gable roof, 32-degree angle, the whole pie is:

— rafters 50x150, membrane, 50x50 counter-batten, 25x150 crate, 12mm OSB, carpet, shingles 5mm.

Share plz. ideas on this subject.

• roof
• gable overhang