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The question must 1st be asked is "what spacing do you plan to use?"
Local codes will apply of course. Up North spacing is closer than that of the South because of snow loads. 16 inches on center is a good number to use.
You said rafters but I wonder if you meant trusses.
Another problem with answering the question is the roof design.
For a ranch style house you would simply multiply the length in feet by 3 and then divide that by 4 and add one for the end this will give you the number of trusses you need. For rafters you need to multiply your number by 2 and add 4 for the barge rafters.
What else can I help you with?
How do you figure out how many diameters do there seem to be around the circle?
you take a zebra and die it blue
How many steps do you have to take to climb a set of stairs?
In my house, 2
Can a figure be a polygon?
A polygon is a closed figure made by joining line segments, where each line segment intersects exactly two others. Many figures are polygons, but take any polygon and remove and edge and you have a figure that is not a polygon. So the anwer is yet it can.
How many hours will it take to travel from Indianapolis to nashville tenn?
Its about 290 miles from Indianapolis to Nashville. Figure about four and a half hours.
How do you figure the radius of a circle?
You take out your ruler and measure it.
How do you find the lenghth of rafters?
The best way to find the length of the rafters in a ceiling is to go up into the attic. Once a person is in their attic, they should be able to see the rafters and can take a tape measure to find the length of them.
How do you figure how big a furnace do to heat a home?
You take the size of your home in square feet and times it by how many rooms you have. A 70,000 BTU furnace will heat a house 1600 square feet.
How many baseball players does it take to figure out a math problem?
27
How many ice cubes does it take to equal 1oz of water?
figure it out
How many years does it take to become a professional figure skater?
7 years
How long would it take to travel 39 miles?
Distance can't be expressed in time. If it could, then you'd be able to figure out how many minutes high your house is, and how many miles of sleep you had last night. With many thanks to another WA contributor who put his words to my thoughts.
How do you figure out how many diameters do there seem to be around the circle?
you take a zebra and die it blue
How many days did it take for Percy Jackson to get to mount Olympus?
Read the book and figure it out?
How do you figure 5 inches equals how many feet?
you take 5 divided by 12 to find out how many feet it is
How many people does it take to build a house?
1 at a minimum.
How many acers does the White House take up?
two
How many years did it take to build the White House?
It took 8 years to build the White House.
