{"id":4111,"date":"2023-10-06T09:44:33","date_gmt":"2023-10-06T09:44:33","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=4111"},"modified":"2023-10-06T09:52:37","modified_gmt":"2023-10-06T09:52:37","slug":"week-5-ss3-second-term-technical-drawing-td-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-5-ss3-second-term-technical-drawing-td-notes\/","title":{"rendered":"Week 5 – SS3 Second Term Technical Drawing (TD) Notes"},"content":{"rendered":"

\u00a0WEEK FIVE<\/strong>
\n\t\tTopic<\/strong>: Roofs: Flat, Pitched, Gable, Butterfly, Lean-to, collar, hip etc.<\/p>\n

\u00a0Content:
\n<\/strong>(i) Meaning and types of roof.
\n(iii) Development of a roof.<\/p>\n

\u00a0Meaning and types of roof.
\n<\/strong>Roofs are building structures that provides covering for the entire building and protects any internal decoration or fittings from the weather and thereby rendering the house habitable.
\nRoofs are basically classified into two types and these include flat and pitched roofs respectively. There are different kinds of roof today but we are going to emphasize only the most common ones found around and these include: Gambrel, Shed, Hip, Butterfly, Gable, Flat, Monitor, Half monitor, Arched, Combination, Lean-to, Collar and Mansard roof respectively. See diagrams below for different types of roof.
\n\"\"\/<\/p>\n

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\n\u00a0Evaluations
\n<\/strong>1. Define a roof.
\n2. State 7 types of roofs known to you.
\n3. Sketch butterfly, gable, hip, shed, monitor and lean-to roofs.<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Development of a roof e.g Hip roof.
\n<\/strong>\"\"\/<\/p>\n

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\n\u00a0Method<\/strong>:
\n(i) Draw the front elevation and the plan view of the hip roof.
\n(ii) Take the vertical height AB, of the roof and draw it perpendicular to the plan of a hip as shown.
\n(ii) Join BC; this is the true length of the hip AC.
\n(iv) Draw perpendiculars to CF from points A and H respectively.
\n(vi) With C as centre and radius CB, swing an arc to cut the perpendicular from A at D. Draw a line from D parallel to CF to cut the perpendicular from H at E. Join FE. This is the development of surface X.
\nWith F as centre and radius FE, swing an arc to cut AH produced at G. Join FG and GJ. FJG is the development of
\nsurface Y.
\nEvaluation
\n<\/strong>1. Draw the development of the hip roof shown below
\n\"\"\/
\n\t\t\t<\/strong>
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\n\u00a0Deyermination of the pitch angle of a roof
\n<\/strong>
\n\u00a0The pitch angle of a roof has to do with its slope.
\n\"\"\/<\/p>\n

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\n\u00a0Pitch angle \u03f4 =
\n\t\t\t\t<\/strong>
\n\u00a0General evaluation questions
\n<\/strong>1. State 7 types of roofs known to you.
\n2. Sketch butterfly, gable, hip, shed, monitor and lean-to roofs.
\n3. What is a parapet ?
\n4. Draw a lean-to roof.<\/p>\n

\u00a0Reading assignment
\n<\/strong>Technical drawing by J.N. Green page 109.
\n\t\t\t<\/strong>Google types of roof and the determination of pitch angle.<\/p>\n

\u00a0Weekend Assignment
\n<\/strong>\"\"\/Objective
\n<\/strong>1.<\/p>\n

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\n\u00a0\"\"\/The figure above shows the front elevation and plan of a hipped roof. The true length of the hip rafter is represented by line A. Q1<\/sub>S1<\/sub> B. KP C. PR D. QS.
\n2.<\/p>\n

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\n\u00a0In the figure shown above, the roof members P,Q and R are A. ridge cap, wall plat and eave. B. ridge cap, wall plate and king post. C. wall plate, king post and facial board. D. wall plate, ridge cap, and king post.
\n3. Identify the type of roof shown below. A. Lean-to. B. Butter-fly. C. Hipped. D. Domed<\/p>\n

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\n\u00a0\"\"\/4. The type of roof shown below is called A. gable. B. hip. C. butter-fly. D. lean-to.<\/p>\n

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\n\u00a05. The type of roof shown below is called A. gable. B. shed. C. collar. D. lean-to.
\n\"\"\/<\/p>\n

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\n\u00a0Theory
\n<\/strong>1. Sketch the following types of roof: butterfly, gable, hip, shed, monitor and lean-to roofs.<\/p>\n

\u00a0\"\"\/2. Draw the development of the hip roof shown below<\/p>\n

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\n\t\t\t<\/strong>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00a0WEEK FIVE Topic: Roofs: Flat, Pitched, Gable, Butterfly, Lean-to, collar, hip etc. \u00a0Content: (i) Meaning…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,318],"tags":[],"class_list":["post-4111","post","type-post","status-publish","format-standard","hentry","category-posts","category-second-term-ss3-technical-drawing-td"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/4111","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=4111"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/4111\/revisions"}],"predecessor-version":[{"id":4112,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/4111\/revisions\/4112"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=4111"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=4111"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=4111"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}