Chapter E9 – Installs Exterior Wall Coverings
Many materials and products can be selected for exterior wall finishes. Factors to consider when choosing a type of siding are:
- Climate
- Cost
- Maintenance
- Appearance
- Availability
Topic 1 – Installs Exterior Wall Coverings
Key Competencies
The NOA for Carpenter (2013) identifies the required competencies (skills) for the task of installing exterior wall coverings. These are:
- Select and use tools and equipment such as air compressors, nailers, metal brakes and metal siding tools according to task
- Select wall coverings such as vinyl, wood and composite products according to specifications
- Apply wall coverings for aesthetics and weather protection, according to manufacturers’ specifications using methods such as staggered joints, storey pole, laser level and string lines
- Prepare joints such as butt, scarf, mitre and lap according to wall covering being installed (NOA p. 61)
Wood Siding Terminology
- Water table (drip cap) – moulding with a sloped upper surface and groove along the bottom to divert rainwater. Installed above doors and windows
- Furring strip (starting strip) – narrow strip applied to the base of the wall to maintain a uniform profile
- Outside corners (mitred, metal, vertical corner boards) –
- Interior corners
- Head lap – distance or portion of the siding covered by the piece above it
Horizontal
Wood bevel siding is installed horizontally with a minimum 25mm overlap. Each row having equal exposure.
To determine the exposure, one must know the total wall height (wall height + foundation lap) and number of rows.
Formula
Total Wall Height ÷ Proposed Exposure = # of rows (always round up)
With the number of rows we can calculate the exposure.
Total Wall Height ÷ # of rows = Exposure
Vertical
The four basic types of vertical siding are:
- Board and batten – wall covering composed of narrow strips placed over top of wider boards
- Board-on-board – board and batten using equal sized pieces
- Channel – siding with interlocking rabbeted edges
- V-joint – Interlocking tongue and groove siding blind nailed throught the tongue
Wood Shingles and Shakes can also be used as exterior wall coverings.
For application information, review:
- Carpentry, study the chapters on “Wood Siding Types and Sizes” (Chapter 63) “Applying Vertical and Horizontal Wood Siding (Chapter 64) “Wood Shingle and Shake Siding” (Chapter 65)
- Canadian Wood-Frame House Construction, “Wall Sheathing and Exterior Finishes”
- National Building Code of Canada, review section 9.27 on “Cladding”
Instruction Sheet on Brightspace:
- EXFN 200 – IS 2.2 – Apply Exterior Wood Siding, p. 45-52
Review Questions
- A minimum clearance of _____ mm must be maintained between wood siding and the ground level.
- The distance between a roof surface and wood siding should not be less than _____ mm.
- The minimum amount of lap allowed for bevel siding is _____ mm.
- What are four basic types of wooden vertical siding?
- Bevel siding which has been mitered for an external corner will be longer at the ____ (Top or Bottom).
- When a piece of bevel siding required a mitered cut at one end and a square cut at the other end, which end should be cut first?
- Referring to figure 22 below, flashing could be omitted above the opening if dimension “B” is _____ of “A” or less.
- In figure 22 above, if dimension “A” was 400 mm and no flashing was installed, dimension “B” could not be greater than _____ mm.
- Minimum overlap for building paper is _____.
- Flashing shall be installed at every horizontal junction between two different exterior finishes except where the _____ overlaps the _____ by not less than 25 mm.
- If aluminum flashing is used, it shall be separated from the stucco (brick veneer) by an __________ or _________.
- True or False:
- Before applying siding, the distance from the soffit to the foundation should be measured.
- A story pole is sometimes used when laying out wood siding exposure.
- A starter strip is required under the first row of bevelled siding.
- Bevelled siding should be nailed so that the nail passes through the top edge of the course below. This will prevent the siding from cupping or splitting.
- When corner boards are used with bevel siding on an internal corner, the corner boards are installed after the siding is applied.
- When bevel or drop siding is used, butt joints need not be staggered if they are nailed on a stud.
- Bevelled siding should be cut short of window and door casings so that the crack may be filled with calking compound.
- Given the information, answer the questions below:
- o Wall height = 2870 mm
- o 200 mm siding
- o Minimum overlap
- How many rows of siding are there?
- What is the exposure of each row of siding?
14. Given the following information, answer the questions below:
- o Wall height = 3060 mm
- o 220 mm siding
- o Minimum overlap
- How many rows of siding are there?
- What is the exposure of each row of siding?
- Find the exposure and number of rows of bevel siding for the following:
- o Wall height 9’-6”
- o 8” siding
- o Foundation overlap of 1”
- How many lineal feet of bevel siding is required for the following building:
- o 26’-0” x 40’-0” Bungalow
- o 10’ high walls with 16” floor system
- o 9 ¼” Bevel siding
- o 1” foundation lap
- o Do not allow for waste
Answers:
- 200 mm (9.27.2.4-1)
- 50 mm (9.27.2.4-2)
- 25 mm (9.27.6.3-2)
- Board and batten, board on board, channel, and V-joint
- Bottom
- Mitred end cut first
- ¼
- 100 mm
- 100 mm (9.27.3.3-2)
- Upper, lower
- Impervious or coating membrane (9.28.1.5)
-
- True
- True
- True
- False
- False
- False
- False
-
- 17
- 169 mm
-
- 16
- 191 mm
- 17 rows @ 6 ¾”
- 2244 Lineal feet of bevel siding