Grade
10
TVL-ICT
TECHNICAL DRAFTING
QUARTER 4 – MODULE 6
DRAWING OF A ROOF PLAN
(Prepare Plan Using CAD)
Prepared by:
Reviewed by:
SALVADOR C. LAVARIAS
Master Teacher II
San Jacinto National High School
RODOLFO L. AQUINO
Master Teacher I
LMSAT
Validated by:
GINA Q. AQUINO PhD.
Head Teacher III
San Jacinto National High School
Prepare Plan Using CAD
This lesson aims to familiarize the students in drawing of a roof plan.
A) INTRODUCTION:
A good architectural working drawing should be transparent, clear, ordered, well-planned,
and accurately drawn so that scaled dimensions match the actual structure and provide the
contractor with the exact details he needs. Architectural working drawings are completed
drawings produced by an architect or draftsman and used by the contractor.
B) READINGS / LECTURES:
DRAWING OF A ROOF PLAN
This lesson is designed to assist you in creating an AutoCAD layout of a successful
roof plan design using the same floor plan developed in the previous lessons.
Some roofs and exterior walls are particularly vulnerable to leaks and water damage.
Roof valleys, the junction of a dormer wall and the roof line, chimney, and skylight
perimeters—basically, wherever there is a lot of runoff or two opposing surfaces cross. These
areas necessitate the additional security that blinking offers.
ROOF is the uppermost covering of a building or shelter that provides protection from animals
and weather, such as rain or snow, fire, wind, and sunlight. It is a house's or building's
external upper covering. It depicts the scale, shape, and materials that should be used in
the roofing system.
TERMS TO REMEMBER:
Eave - is a part of a roof that projects over a wall.
Fascia - is a surface finish material used to cover another surface.
Drip edges - prevent water from seeping under roofing along the edges of rakes and eaves.
Overhang - is the horizontal distance that a roof projects beyond a wall.
Ridge - is the top edge of the roof where rafters meet.
Ridge cap - is a wood or metal cap used for roofing at the ridge.
Ridge roll - a rounded-on-top wood strip used to finish the ridge of a roof, which
is frequently covered with lead sheathing; a metal or tile covering that
caps the ridge of a roof.
Flashing - is a thin material, usually galvanized steel, that professional roofers use to direct
water away from critical areas of the roof, wherever the roof plane meets a
vertical surface like a wall or a dormer. Flashing is installed to
surround roof features, such as vents, chimneys, and skylights.
Valley - is the internal angle formed by two slopes of a roof.
BASIC TYPES OF ROOFS:
There are various types of roof designs that are widely used in building
construction. Among them are:
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1. GABLE ROOF
A gable roof is made up of two roof parts that slant
in opposite directions and converge at the highest
horizontal edges to form the ridge.
2. HIP ROOFS
A hip roof is a type of roof in which all the sides
slope down to the walls. They are widely used
when eave-line security around the entire
perimeter of a building is required.
3. FLAT ROOFS
In comparison to the various styles of sloped
roofs, a flat roof is a roof structure that is almost
level.
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4. DORMER ROOF
A dormer roof is a type of roof structure that often
includes a window that extends vertically beyond
the plane of a pitched roof.
5.LEAN-TO-ROOF
A single slope roof with its upper edge adjacent to
a wall or a house. It is a basic structure that was
originally added to an existing house.
6. SHED TYPE ROOFS
It has a flat roof that slants in one direction. They
can be used effectively when there are two levels
where additional light is needed.
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7. GAMBREL ROOF
It has two slopes on each side, with the lower
slope being much steeper than the upper.
8. DOME ROOF
It is a form of hemispherical roof.
9. BUTTERFLY ROOF
(Also known as a V roof) is a type of roof that is
distinguished by an inversion of a normal roof
shape, with two surfaces sloping down from
opposing edges to a valley near the roof's center.
10. MANSARD ROOF
It is a four-sided gambrel-style hip roof with two
slopes on either side, the lower of which is
punctured by dormer windows at a steeper angle
than the upper.
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The floor plan created in the previous lesson is shown below, with the roof lines made of
hidden lines.
Figure 1: Floor plan showing roof lines.
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A roof plan portrays the roof's outline as well as the main object lines showing ridges,
valleys, hips, and openings. The roof plan is a 2D plan view of the roof rather than a framing
plan.
Figure 2: Roof Plan.
SIMPLE STEPS FOR CREATING A ROOF PLAN IN AUTOCAD
1. Change the Roof layer to current.
2. Change the properties of all roof lines (hidden lines - see Figure 1) to continuous lines.
3. Offset the roof line perimeter by 0.20 meter to make room for the gutter.
4. Trim the excess diagonal lines (ridges) using the gutter lines as boundaries.
5. Offset these diagonal lines (ridges) by 0.15 meter on both sides to make room for the
ridge cap.
6. Use ANSI34 to construct a rib-type impact roofing following the arrow for the slope
direction.
7. Locate the position of downspout symbols (DS) using small circle.
8. Make a label for the roof plan.
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TYPES OF ROOF FLASHING
1. Chimney flashing is applied in three sections across the base of a chimney: continuous
flashing around the bottom, step flashing up the sides, and saddle flashing at the top. The
cap flashing, which is mortared or caulked into the chimney, laps over the top edges of
the other flashings to keep water from flowing behind them.
2. Continuous flashing covers the intersection of a vertical wall and a sloped roof.
Drip edges keep water from seeping under roofing along rake and eave edges. They are
installed under the roofing felt along the eaves and over the roofing felt along the rakes.
3. Skylights frequently have their own built-in flashing. Their curbs are otherwise flashed
with continuous flashing along the bottom, step flashing up the sides, and saddle flashing
across the top.
4. Step flashing is a form of flashing that steps up a roof to cover the area where the roof
meets the side walls of dormers, chimneys, and some skylights. It is made up of a series
of right-angled metal parts that are worked into a course of shingles such that each
section overlaps the section beneath it. The vertical edge of the flashing is normally
tucked under siding or capped with a second counter flashing that is mortared into the
chimney or caulked around a skylight to prevent water from entering behind it.
5. Valley flashing covers the valleys formed by the intersection of two roof planes. This Wshaped channel is mounted over the top of the building felt prior to the installation of the
roof's finishing material.
6. Vent pipe flashing is designed to fit over flues and pipes. It is cone-shaped and has a
flange at the base that is worked into the shingles when the roofing is installed.
C) ACTIVITY PROPER:
TELL ME THE TRUTH!
Directions: Write T if the statement is True and F if it is False. Write the
letter of your answer in the space provided for before each number.
______ 1. Eave is a part of a roof that projects over a wall.
______ 2. It is a surface finish material used to cover another surface is called
facia.
______ 3. Flashing prevent water from seeping under roofing along the edges of rakes
and eaves.
______ 4. Overhang is the horizontal distance that a roof projects beyond a wall.
______ 5. The top edge of the roof where rafters meet is called ridge
______ 6. Ridge cap is a wood or metal cap used for roofing at the ridge.
______ 7. The internal angle formed by two slopes of a roof is valley.
______ 8. Roof is the uppermost covering of a building or shelter.
______ 9. It has a flat roof that slants in one direction is called Lean to Roof.
______ 10. A hip roof is a type of roof in which all the sides slope down to the walls.
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SEARCH ME NOT!
Directions: Look closely at the given pool of words in the box. Find and
encircle them in the Word Search.
BUTTERFLY
GAMBREL
OVERHANG
MANSARD
DORMER
FLASHING
ROOF
FLAT
RIDGE
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DOME
GABLE
VALLEY
SHED
HIP
FACIA
ANSWER KEY (Learning Activities)
TELL ME THE
TRUTH!
SEARCH ME NOT!
1. T
2. T
3. F
4. T
5. T
6. T
7. T
8. T
9. F
10. T
REFERENCES
Arriola C.T, Bermas, D.B., Milambiling O.M. & Guevarra, Jr., V.O. (2013). Technology
and Livelihood Education 10. Pasig City, Philippines: Department of Education
Hornilla, C.M., Francisco, H.G., & Lazo, Jr., T.P. (n.d.). Theory of Technical Drafting,
Metric Edition Part
Lavarias, S. (2017). A Module: Preparing Computer-Aided Drawings.
Geddes & Grosset (2002). Webster’s Universal Dictionary and Thesaurus. Scotland:
David Dale House
Ma”Din Polytechnic College. (n.d.) Computer Aided Drafting Lab. Retrieved from
https://www.madinpoly.com/lm/401-20%
COMPUTER%20AIDED%DRAFTING%20LAB.pdf
Ronsairo, E.E. & Bagayana, J.M. (2020). TECHNICAL DRAFTING 10 Quarter 2 Module
7: AutoCAD Design Center (1st ed.). Department of Education.
(“To Create Annotation Scales and Assign Them to Display Configurations | AutoCAD
Architecture 2019 | Autodesk Knowledge Network,” 2018)
https://www.facebook.com/jorge.fontan.9. “10 Things to Consider When Building a
House · Fontan Architecture.” Fontan Architecture, 20 Apr. 2017,
fontanarchitecture.com/things-to-consider-when-building-a-house/. Accessed 3 Apr. 2021.
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D) SUMMATIVE EVALUATION:
PERFECT MATCH!
Directions: Match the basic types of roof in column A with their drawings
in column B. Write the letter of your answer in the space provided for
before each number.
COLUMN A
COLUMN B
_____ 1. GABLE ROOF
A.
_____ 2. HIP ROOF
_____ 3. FLAT ROOF
B.
C.
_____ 4. DORMER ROOF
_____ 5. LEAN-TO-ROOF
D.
E.
_____ 6. SHED ROOF
_____ 7. GAMBREL ROOF
F.
G.
_____ 8. BUTTERFLY ROOF
_____ 9. DOME ROOF
H.
I.
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ENUMERATE ME! (5 pts.)
Directions: Enumerate what have been asked and write the correct
answer. Use separate paper if necessary.
Enumerate the different Types of Roof Flashing
1.
2.
3.
4.
5.
6.
EASY OR ESSAY!
Performance Task (10pts.)
Directions: Explain the simple steps for creating a Roof Plan.
(Vernacular or Tagalog is allowed)
.
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