The picture below provides you with a perfect example of
two parallel lines that run in the same direction. In the construction
business, roof rafters, floor joist, stair stringers and even some walls
run parallel to each other.
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Parallel house framing components like roof rafters
and floor joist, usually make it easier to install insulation, plywood,
wallboard and siding.
Parallel Building Tips
One of the most important things that any framing carpenter needs to
understand is the importance of parallel building parts. If I'm building
a roof and my roof rafters aren't parallel to each other, it's can
create problems when I start to lay the plywood down, for the roof
sheeting.
For Example: The plywood used by most carpenters to sheath a roof is
usually 4 foot wide and 8 foot long. If I have all of my roof rafters
laid out correctly on the bottom, but they're not laid out correctly as
I work my way towards the top of the roof ridge, I'm going to have
problems installing my plywood.
Building components that aren't parallel or laid out correctly, are
going to eventually lead to more waste. It's going to take longer to
install the plywood and you're usually going to end up with more cuts
and wasted plywood.
Even though it might take you a little longer to frame the roof
correctly and make sure that all of the rafters are parallel to each
other, you will eventually make it up on the next step, when you start
to install your roof plywood.
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