to support the frame work of the roof

to receive the ends of principal rafter

to prevent the walls from spreading outward

to prevent the tie beam from sagging at its centre

to support the common rafter

to support purlins

to prevent the purlins from tilting

all of the above

the underside of a stair

outer projecting edge of a tread

a sloping member which supports the steps in a stair

a vertical member between two treads

balusters

newal posts

balustrades

railings

10

12

15

no limit