Sistering is a very inefficient way to increase the strength of a member.
Doubling the member's thickness only doubles it strength. Increasing it's
width (or height) increases the strength as the cube of the dimension.
{Deflection ~ Young's modulus x moment of inertia}.

I'm Ted Bell!




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On Jan 28, 9:00 pm, Charlie Morgan wrote:
..... sistering is construction reinforcement where you attach
an additional timber to an existing one to add strength.


Wrong

For example (as Jeff said) a frame in a wooden boat can be sistered
but the new frame isn't attached to the old one.

-signed- Injun Ear