Billy sets huge rafters called trusses on
the outside of the walls. The trusses hold
up the roof. How many nails do you think
Billy has used so far? He will use about
80,000 nails to build just one house.
Billy sets huge rafters called trusses on
the outside of the walls. The trusses hold
up the roof. How many nails do you think
Billy has used so far? He will use about
80,000 nails to build just one house.