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Exterior Wall Finish

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Wall Sheathing and Flashing. Siding can be applied over various sheathing materials. ... Metal flashings must be applied (13-18) Installing Horizontal Siding ... – PowerPoint PPT presentation

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Title: Exterior Wall Finish


1
Chapter 13
  • Exterior Wall Finish

2
Cornice
  • Definition the overhang of a roof at the eave.
  • Includes the fascia board, a soffit, and any
    moldings.
  • Provides a finished connection between wall and
    roof.

3
Rake
  • Definition Part of a roof that overhangs a
    gable.
  • Projecting roof boards support trim for boxed
    rake section.
  • Roof framing is extended when the rake projects a
    considerable distance.

4
Framing a Cornice
  • Install ledger strip along wall
  • Mark points with level that match up with bottem
    edges of rafters
  • Nail on the ledger strip
  • Cut the lookouts
  • Toenail one end of the lookout to the ledger and
    nail the other end to the overhang of the rafter
  • Apply the soffit

5
Prefabricated Cornice Materials
  • Various systems available
  • Ex. 3/8 laminated wood-fiber panels
  • Fasten with 4d rust-resistant nails spaced about
    6 along edges and intermediate supports
  • Nail main supports first and then along edges
  • Always leave space for expansion

6
Metal Soffit Material
  • Provided in rolls and sheets in several widths
  • Aluminum systems are suggested
  • Widths vary from 12 48
  • Edges are held in runner guides that are
    attached to fascia and walls
  • Consists of 3 basic units
  • Wall hanger strips (frieze strips)
  • Soffit panels
  • Fascia covers

7
Hanging Metal Soffit
  • Snap a chalk line along the side wall, level
    with the bottom edge of the fascia board
  • Attach metal U-shaped wall hanger strip along
    line
  • Attach hanger strip flush with the bottom fascia
    or nail the metal soffit panels to the bottom of
    the fascia board as panels are installed
  • Insert the panels
  • Cut metal or vinyl fascia cover to fit and
    install it

8
Soffit (Cont.)
9
Horizontal wood siding
  • One of the most common materials
  • Usually applied over a base of sheathing and a
    house wrap
  • Bevel siding is most common
  • Available in various widths
  • Made by sawing plain surface boards at an angle

10
Wood Siding (Cont.)
  • Channel Rustic siding
  • has shiplap type joints
  • Drop siding
  • usually has tongue-and-groove joints
  • heavier, has more structural strength

11
(No Transcript)
12
Wall Sheathing and Flashing
  • Siding can be applied over various sheathing
    materials.
  • Solid wood, plywood, or nail-base fiberboard is
    nailed directly to the material at about 24
    intervals.
  • Gypsum board and regular fiberboard sheathing
    cannot be used as a nail base and the siding
    should be nailed through the sheathing and into
    the frame.

13
Sheathing Substitutes
  • An insulation board of rigid polystyrene (13-17)
    can take the place of sheathing and sheathing
    paper
  • Metal flashings must be applied
  • (13-18)

14
Installing Horizontal Siding(Preparing a Story
Pole)
  • Lay out the distance from soffit to 1 below top
    of foundation.
  • Divide distance into spaces equal to the width of
    the siding minus the lap.
  • Adjust the lap allowance so spaces are equal.
  • Mark position of top of each siding board on the
    story pole when layout is complete.

15
Installing Horizontal Siding(Continued)
  • Start application of bevel siding by first
    nailing a strip along the foundation line equal
    to the thin edge of the siding.
  • Apply the first piece.
  • Allow the butt edge to extend below the strip to
    form a drip edge.
  • Inside corners can be formed with a square length
    of wood or metal corners. Outer corners are
    usually made of metal. Install.
  • After the corner boards are in place, fit the
    siding tightly against them.
  • Wood siding can be given a coat of
    water-repellent preservative before it is
    installed, or it can be brushed on after
    installation

16
Nailing
  • To fasten siding, noncorrosive nails are
    recommended.
  • Horizontal siding should be face-nailed to each
    stud.
  • For narrow siding, the nail is generally placed
    about ½ above the butt edge.
  • Different types of wood siding require different
    nailing patterns. (Fig. 13-26)

17
Estimating Siding
  • Increase the footage to make up for the
    difference between nominal and finished sizes.
  • The net square footage of the wall surface to be
    covered should be multiplied by the factor in the
    chart to your left.

18
Vertical Siding
  • Commonly used to set off entrances or gable
    ends. Also for main wall areas.
  • May be plain-surfaced matched boards, pattern
    matched boards, or square-edge boards covered at
    the joint with a batten strip.
  • Made from solid lumber, should be no more than
    8 wide.

19
Wood Shingles
  • Sometimes used for wall covering, and a large
    selection of types is available.
  • Very durable and can be applied in various ways
    to provide a variety of architectural effects.
  • Most shingles are made in random widths
  • Shingles in side walls are frequently laid in
    double coursing
  • Double coursing- when you use a lower grade
    shingle under the shingle exposed to the weather.
    The exposed single butt extends about ½ below
    the butt of the under course.

20
Single Coursing of Side Walls
  • Similar to roof applicationdifference is in the
    exposures employed.
  • Present less weather-resistance problems than
    roofs.
  • Weather exposure of shingles should never be
    greater than half the length of the shingle,
    minus ½.
  • Should have concealed nailing.

21
Shingle and Shake Panels
  • Shingles and shakes for side wall application
    are available in panel form.
  • Usually western red cedar.
  • Standard size 8
  • Applied by following the same basic precaution
    and procedures described for regular shingles.
    However, takes less time.

22
Plywood Siding
  • Uses
  • Provides a vertical treatment to gable ends.
  • Provides emphasis as fill-in panels above and
    below windows.
  • Establish a continuous decorative band at various
    levels along an entire wall.
  • Must be made from exterior type plywood.
  • Most common- Douglas fir
  • Panel sizes are 48 wide by 8,9,10 long
  • Because large sheets of plywood and hardboard
    siding provide tight, draft-free wall
    construction, it is important to have an
    effective vapor barrier. This should be between
    the insulation and the warm surface of the wall.

23
Joint details for plywood siding
24
Aluminum Siding
  • Factory finished with baked on enamel and
    provides appearance that resembles wood siding
  • Offers low maintenance costs
  • For use on new or existing construction
  • Can be applied over structurally sound surfaces

25
Vinyl Siding
  • Definition a rigid polyvinyl chloride compound
    that is tough and durable
  • Installed with a backing or insulation board
  • Panels have interlocking joints that are
    waterproof
  • No movement during expansion or contraction

26
Installing Vinyl Siding and Soffits(Preparing
the old siding)
  • Nail loose boards trim-replace rotted boards
  • Remove old caulk from windows and doors
  • Remove downspouts, lighting fixtures and
    moldings that interfere with new siding
  • Tie back shrubs and trees that can be damaged

27
Installing Vinyl Siding and Soffits(Continued)
  • Allow a ¼ expansion gap where siding meets
    accessories when cutting
  • Do not drive nails tight against the siding,
    leave a gap of about 1/8
  • See fig. 13-61 for Installing Starter Strips and
    Trim

28
Installing Siding Panels
  • The first siding panel snaps into the bottom of
    the starter strip.
  • Work toward the front of the building, finishing
    each side before starting the next
  • Always cover largest areas first smaller panels
    can be used up on the smaller surfaces, such as
    dormers
  • Overlap each panel 1, face butt edge away from
    the main traffic areas.

29
Stucco
  • Base consists of wood sheathing, sheathing paper,
    and metal lath
  • Apply second coat when first is dry to give a
    smoother pebbled finish
  • Typically, the finished stucco wall is 7/8 thick

30
Exterior Insulation Finish Systems
  • Definition also called synthetic stucco and
    are similar in appearance to stucco.
  • Available either as polymer-based (soft-coat
    systems, typically 1/8 thin) or polymer-modified
    (hard-coat systems, about ¼ and are mechanically
    attached.)
  • Installation
  • Can be installed over wood, concrete, concrete
    block, and other substrates.
  • Base coat should be at least 3/16 thick, apply
    two layers
  • Mesh is installed with laps offset from edges of
    openings, joint, grooves, and corners.
  • If base coat is required before applying the
    finish coat, it should e applied in 2 thin layers
    (1/16 each)

31
Brick or Stone Veneer
  • Veneer Wall- masonry wall, a wall framed in wood
    or metal to which stone, brick, or even concrete
    bockare attached rather than siding

32
Tools
  • Trowel is the most used tool in the masons tool
    kit.
  • Toe (or point) pointed end of the trowel
  • Heel the wide end of the trowel
  • Masons level is also an important tool.
  • Has both vertical and horizontal vials, read from
    either side.
  • Aluminum or wood with metal edges.
  • Two rules, 6 folding with a 6 sliding scale the
    other a 10 steel tape
  • Jointers or jointing tools are used to compress
  • A brick hammer is used to drive nails, strike
    chisels, and break or chip masonry units

33
Masonry Materials
  • Bricks are structural units made to several sizes
    from clay or shale.
  • Material mixed with water then dried in large
    kilns
  • Building or Common Brick
  • A strong general purpose brick intended for use
    where strength is more important than appearance
  • Three grades
  • SW grade resists freezing
  • MW grade is used where there may be exposure to
    below freezing temp. but in dry locations
  • NW grade is used to back up interior masonry

34
Masonry Materials (Continued)
  • Facing used where appearance is important
    Three types
  • FBX is for general use in exposed interior or
    exterior walls or partitions. Color and size are
    uniform
  • FBS is for general use in exposed exterior and
    interior walls and partitions where wider color
    variations and sizes are permitted
  • FBA is used to produce architectural effects
    produced by lack of uniformity in size, color,
    and texture
  • Mortar is mostly portland cement with the
    addition of hydrated lime and sand.
  • Designed to bond bricks and block into a strong,
    waterproof wall.

35
Blinds and Shutters
  • Installed at sides of window units
  • Consist of frame assemblies with solid panes or
    louvers
  • Used to protect the glass, provide security when
    locked. Serves decorative purpose now
  • Attached to exterior wall with screws or other
    fasteners
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