Armed with the knowledge and skill necessary to construct a Gable Roof, we now turn our attention to the Hip Roof. The middle part of the Hip roof is identical to the Gable Roof of the same slope, but the two ends appear to be cut off at the same angle and the triangular surfaces leaned into the remaining part. The end surfaces (shorter sides) of the Hip Roof are triangles and the side surfaces (longer sides) are trapezoids.
First we will focus on the hip rafter which runs from the outside corner of the building to the ridge. Its rise is the same as the common rafter but its run is longer since it runs at 45° to the plane of the ceiling. Therefore the angle of the hip rafter is less than the angle of the common rafter.
If we calculate the diagonal of a 12" square, it will be 16.97" or 17" as a whole number. So if a building has a run of 12', the common rafter has a total run of 12', but the hip rafter will run approximately 17' and so with the same rise we have 2 different unit triangles.
Follow the PowerPoint at your own pace and then attempt the questions.
First we will focus on the hip rafter which runs from the outside corner of the building to the ridge. Its rise is the same as the common rafter but its run is longer since it runs at 45° to the plane of the ceiling. Therefore the angle of the hip rafter is less than the angle of the common rafter.
If we calculate the diagonal of a 12" square, it will be 16.97" or 17" as a whole number. So if a building has a run of 12', the common rafter has a total run of 12', but the hip rafter will run approximately 17' and so with the same rise we have 2 different unit triangles.
Follow the PowerPoint at your own pace and then attempt the questions.
The hip roof 1-ns from mnauth
This Youtube video shows basic step-by-step methods for laying out and cutting the hip rafter.
Follow the example in the PowerPoint. Copy each of the required tables to WORD documents. You can print them, fill them out neatly by hand, scan them, and submit them using the 'hand' icon.
Alternatively, in WORD, set the margins to 'narrow', and expand the image to fill the page by clicking on the picture and pulling the bottom right corner with the mouse's left button depressed. Click "insert", then "text box", and then draw a text box over the underlined spaces where the answers are to be placed. Fill in the blanks and submit the completed pages by clicking on the 'hand' icon.
Alternatively, in WORD, set the margins to 'narrow', and expand the image to fill the page by clicking on the picture and pulling the bottom right corner with the mouse's left button depressed. Click "insert", then "text box", and then draw a text box over the underlined spaces where the answers are to be placed. Fill in the blanks and submit the completed pages by clicking on the 'hand' icon.
PRACTICAL ASSIGNMENT - Cutting the Hip Rafter
Following the instructions on the PowerPoint or in the text, use a 2 x 6 and layout and cut 4 hip rafters for the roof that you are constructing. Remember that the roof is being built for a building that is 4' x 8' and the roof slope is 9 in 12. The common rafters will be 16" on centre and the hip jacks will be 12" on centre. Use 4" for the projection.
Take a photo of your work and submit it using the 'hand' icon.
Two of the hip rafters will be 'dropped' and the other two will be 'backed' of bevelled. Save the two to be backed for the next lesson.
Take a photo of your work and submit it using the 'hand' icon.
Two of the hip rafters will be 'dropped' and the other two will be 'backed' of bevelled. Save the two to be backed for the next lesson.