The message
from "Suz" contains these words:

We want to specify heavier than normal joists in the extension. What size
should we ask for?

Someone else who wants a shagswing! (insert smiley of choice here).

Explain to whoever's designing it what the purpose of the extra strength
is and they'll make the calculations accordingly.

--
Skipweasel
Pay no attention to that man behind the curtain.