Doubled rafters, separated by cleats, spacers or distance pieces.
see also Cleat
a) Aisle b*) Aisle plate c) Aisle tie d) Compound rafter e) Cleat f) Secondary rafter g*) Arcade plate h) Tiebeam i) Arcade post (here unjowled) j) Strainer beam k) Arcade l) Wall post m) Aisle rafter