Activity 10.2 – Technology – Objectives & Tools Michael Nauth EDDL5101
Bloom’s Digital Taxonomy and Framing the Gable Roof
Upon completion of this unit you will be able to:-
- Identify and name the various types of roof designs and roof framing components
- Draw, layout, calculate, cut, and frame roof components for a Gable rafter roof
Remembering
- Follow the links below list the various roof types
- Highlight the key roof names and roof framing components in your e-text
Roof types – links
http://www.diynetwork.com/home-improvement/all-about-roofs-pitches-trusses-and-framing/index.html
http://www.slideshare.net/stootypal/roof-types Slides 1 – 21, 22 – 26, Note #27 is incorrect. Why?
http://www.slideshare.net/fullcircle/roofframing Slides #1- 10
http://www.slideshare.net/tariqmx2/roof-1418984 Slides #7 – 27, Note # 28 & 29 are incorrect. Why?
Understanding
- Follow the links to compare roof shapes to the isosceles and the right-angled triangles
- Draw a unit roof triangle (5/12) on graph paper lines (run or horizontal side of 12, rise or vertical side of 5), draw squares on each of the 3 sides, and then cut out each square and determine the relationship of the big square to the two smaller ones
- Repeat for 7 & 12 and use the architectural scale to determine the length of the hypotenuse
- Compare your measurement to the one found using the Pythagorean theorem
http://www.slideshare.net/CRattan/isosceles-triangle-exploration?from_search=5
http://www.slideshare.net/teacherfidel/isosceles-triangles
Right-Angled Triangles and Pythagoras’ Theorem
http://learni.st/learnings/99012-pythagoras-theorem?board_id=13622
http://www.carpentry-pro-framer.com/pythagorean-theorem.html
Applying
- Follow the slideshow below to confirm your knowledge of similar triangles
- http://www.slideshare.net/wartschowk/similar-triangles-concept?from_search=7
- Apply the Pythagorean Theorem to find the hypotenuse of the total roof triangle
- Use the ratio principle of similar triangles to determine the sloped length of the roof
- Use scaled drawings, the protractor, and the speed square to determine roof rafter angles
Analyzing
- Find the rafter tables on the framing square http://en.wikipedia.org/wiki/Steel_square
- Compare the findings on the Framing Square Tables to the calculations using Pythagoras
- Parallel your findings to the full-sized roof using the HTML below
http://www.carpentry-pro-framer.com/gable-roof-framing.html
Evaluating
- Review the slides on trig ratios à http://www.slideshare.net/guestd1dc2e/trigo-ratios
- For roof triangles, we use the Tangent ratio (#17 – 20)
- Right-angled triangles (90E), Tangent ” = = O/A= Rise/Run
- Apply trigonometric ratio of tangent (rise/run) to calculate roof rafter angles (7/12 slope)
- Download the Rafter Calculator, experiment with the input values, and check your answer
http://www.mediafire.com/download/csi5nikf26vf2kn/Rafter_Calc.v1.4.exe Rafter Calc.
Creating (digital)
- Download the program, Google Sketchup, http://www.sketchup.com/
- Follow the YouTube videos below to get familiar with the program
- Draw a building with a Gable roof, using Google Sketchup
- Determine roof rafter lengths and angles
http://www.youtube.com/watch?v=gsfH_cyXa1o Getting Started
http://www.youtube.com/watch?v=fBdP499iw0Y Layers
http://www.youtube.com/watch?v=JTr8-tPvurE Protractor – Roof slope
Tags: EDDL 5101