"Bob Mannix" wrote in message
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"dennis@home" wrote in message
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"The Natural Philosopher" wrote in message
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Don't assume. Rafters are largely in compression.

If rafters are in compression what keeps the walls from spreading out?

Usually the ceiling joists to which the rafters are fixed or collar ties.
Except for an old barn I have responsibility for, where there are no
ceiling joists and the collar ties are not substantial enough. The walls
are spreading out.

6 mm stainless wire stretched across is incredibly strong.