
Calculating Ridge Height and Rafters

Interactive Video
•
Mathematics, Architecture
•
9th - 12th Grade
•
Hard

Jackson Turner
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of today's video?
To learn how to calculate the height of a ridge board for a common rafter roof
To understand the basics of carpentry
To learn how to install a roof
To calculate the length of a rafter
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does a 9/12 common rafter roof mean?
The roof has a span of 12 feet and a run of 9 feet
The roof has a span of 9 feet and a run of 12 feet
The roof rises 12 inches for every 9 inches of horizontal run
The roof rises 9 inches for every 12 inches of horizontal run
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the total run of a roof with an overall span of 4 feet?
2 feet
4 feet
6 feet
8 feet
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to sight down all rafter and ridge material?
To ensure the wood is dry
To check for any cracks
To measure the length accurately
To ensure the crown is facing up
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the recommended size for a ridge board if the rafters are 2 by 6?
2 by 8, 10, or 12
2 by 4
2 by 2
2 by 6
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the measuring line used for?
To base all initial math calculations
To measure the length of the rafter
To determine the width of the ridge board
To mark the bird's mouth cut
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula to find the theoretical ridge height?
F = B * D / 12
F = B + D / 12
F = B - D / 12
F = B / D * 12
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