Part4_Roof_framing

include component="page" page="toolbar_tcj2O" editable="1" Housing Unit: Part 1 | Part 2 | Part 3 | Part 4 **
 * Construction Technology**
 * HOUSING UNIT (TCJ2O)**

Part 4: ROOF FRAMING **

Start your roof framing by measuring the width of your end wall, it should be about six inches. This will be the height of your knee wall which your roof rafters will rest on.

1 Build your knee wall with the studs placed exactly above those in the wall below. By doing this you will create a roof on a 45 degree angle. This will mean all your roof rafters may be cut at each end on a 45 degree angle.

2 For your roof rafters you will be using the same material as you used for your floor joists. These would be 2 x 10’s in real life. Once your knee wall is built you may hold a piece of rafter material beside your model and trace where the two notches for the walls will be located. These notches are known as a birdsmouth.

3 Next you will need two plumb cuts marked on your rafter, one will determine the rafter extension for your soffit the other at the top is in line with the knee wall.

4 The only other marking will be a horizontal cut at the bottom for your soffit to be placed.

** ROOF FRAMING ** Name:

Answers can be found starting on page 182 to 206. 1) What is the difference between a Gable Roof and a Hip Roof?

2) Give definitions for the following A – Rise B – Run C – Span D – Ridge Board E) – Common Rafter F) – Birdsmouth G) – Projection of Rafter tail

3) On a roof with a 24’ span and a 4 / 12 slope the total rise would be

4) On a roof with a 48’ span and a 8 / 12 slope the total rise would be

5) On a roof with a 12’ span and a 3 / 12 slope the total rise would be

6) Give two methods of finding the length of a common rafter.

7) Why should the attic space be well ventilated?

8) How should Plywood Roof Sheathing be laid?

9) Asphalt shingles are manufactured from ………

10) The thickness of roofing plywood is determined by what?

11) Give a definition roof flashings.

...click on the following for the ANSWERS