Section 9.27 — Cladding

(1) Where lumber, wood shingles, shakes, fibre-cement shingles, planks and sheets, plywood, OSB, waferboard, hardboard, vinyl, insulated vinyl, polypropylene, aluminum or steel, including trim and soffits, are installed as cladding on wood-frame walls or above-ground flat insulating concrete form walls exposed to precipitation, the cladding assembly shall comply with (a) Subsections 9.27.2. to 9.27.13., or (b) Part 5. (2) Where stucco is installed as cladding on wood-frame walls, above-ground flat insulating concrete form walls or masonry walls exposed to precipitation, the cladding assembly shall comply with (a) Subsections 9.27.2. to 9.27.5., and Section 9.28., or (b) Part 5. (3) Where masonry serves as cladding on wood-frame walls, above-ground flat insulating concrete form walls or masonry walls exposed to precipitation, the cladding assembly shall comply with (a) Subsections 9.27.2. to 9.27.4., and Section 9.20., except for masonry veneer, which shall be attached to above- ground flat insulating concrete form walls in accordance with Sentence 9.27.5.4.(2), or (b) Part 5. (4) Where asphalt shingles are installed as cladding on wood-frame walls exposed to precipitation, the cladding assembly shall comply with (a) Subsections 9.26.7. and 9.27.2. to 9.27.4., or (b) Part 5. (5) Where an exterior insulation finish system is installed as cladding on wood-frame, masonry, cold-formed steel stud, above-ground flat insulating concrete form or cast-in-place concrete walls exposed to precipitation, the cladding assembly shall comply with (a) Subsections 9.25.5., 9.27.2. to 9.27.4. and 9.27.14., or (b) Part 5. (See Note A-9.27.1.1.(5)) (6) Where cladding materials other than those described in Sentences (1) to (5) are installed, or where the cladding materials described in Sentences (1) to (5) are installed on substrates other than those identified in Sentences (1) to (5), the materials and installation shall comply with Part 5.

(1) Except where exterior walls are protected from precipitation or where it can be shown that precipitation ingress will not adversely affect occupant health or safety, exterior walls shall be designed and constructed to (a) minimize the ingress of precipitation into the assembly, and (b) prevent the ingress of precipitation into interior space. (See Note A-9.27.2.1.(1)) (2) Except where exterior walls are protected from specific mechanisms of deterioration, such as mechanical impact and ultraviolet radiation, exterior walls shall be designed and constructed to minimize the likelihood of their required performance being reduced to an unacceptable level as a result of those mechanisms.

(1) Reserved. (2) Reserved. (3) Reserved. (4) Exterior walls exposed to precipitation shall be protected against precipitation ingress by an exterior cladding assembly consisting of a first plane of protection and a second plane of protection, where such walls enclose spaces of residential occupancy or spaces that directly serve spaces of residential occupancy. (See Note A-9.27.2.2.(4)) (5) Reserved. (6) Reserved.

(1) Where walls required to provide protection from precipitation comprise cladding assemblies with first and second planes of protection, (a) the first plane of protection shall (i) consist of cladding, with appropriate trim, accessory pieces and fasteners, and (ii) be designed and constructed to minimize the passage of rain and snow into the wall by minimizing holes and managing precipitation ingress caused by kinetic energy of raindrops, surface tension, capillarity, gravity, and air pressure differences, (See Subsection 9.27.4.) (b) the second plane of protection shall be designed and constructed to (See Subsection 9.27.3.) (i) intercept all rain and snow that gets past the first plane of protection, and (ii) effectively dissipate any rain or snow to the exterior, and (c) the protection provided by the first and second planes of protection shall be maintained (i) at wall penetrations created by the installation of components and services such as windows, doors, ventilation ducts, piping, wiring and electrical outlets, and (ii) at the interface with other wall assemblies.

(1) A clearance of not less than 200 mm shall be provided between finished ground and cladding that is adversely affected by moisture, such as untreated wood, plywood, OSB, waferboard and hardboard. (2) A clearance of not less than 50 mm shall be provided between a roof surface and cladding that is adversely affected by moisture, such as untreated wood, plywood, OSB, waferboard and hardboard.

(1) The second plane of protection shall consist of a drainage plane having an appropriate inner boundary and flashing to dissipate rainwater to the exterior. (2) Except for cladding systems conforming to Subsection 9.27.14., the inner boundary of the drainage plane shall comply with Articles 9.27.3.2. to 9.27.3.6. (3) The protection provided by the second plane of protection shall be maintained (a) at wall penetrations created by the installation of components and services such as windows, doors, ventilation ducts, piping, wiring and electrical outlets, and (b) at the interface with other wall assemblies. (4) Flashing material and its installation shall comply with Articles 9.27.3.7. and 9.27.3.8.

(1) Sheathing membranes shall conform to the performance requirements of CAN/CGSB-51.32-M, “Sheathing, Membrane, Breather Type.”

(1) Except as provided in Articles 9.27.3.4. to 9.27.3.6., at least one layer of sheathing membrane shall be applied beneath siding, stucco or masonry veneer. (2) Sheathing membrane required in Sentence (1) shall be applied so that joints are lapped not less than 100 mm. (3) Where sheathing membrane required in Sentence (1) is applied horizontally, the upper sheets shall overlap the lower sheets.

(1) Where non-wood-based rigid exterior insulating sheathing, or exterior insulating sheathing with an integral sheathing membrane is installed, a separate sheathing membrane is not required. (2) Where insulating sheathing is installed as provided in Sentence (1), (a) sheathing panels subject to moisture deterioration shall be sealed at all joints, and (b) the joints of sheathing panels not subject to moisture deterioration shall be (i) sealed at all joints, or (ii) lapped or tongue and groove, and detailed to ensure drainage of water to the exterior. (See Note A-9.27.3.4.(2))

(1) Except as provided in Article 9.27.3.6., where no sheathing is used, at least 2 layers of sheathing membrane shall be applied beneath the cladding. (See Article 9.23.17.1. and Note A-9.27.3.5.(1)) (2) All joints in the sheathing membrane required in Sentence (1) shall occur over framing, and the membrane shall be fastened to the framing with roofing nails or staples spaced not more than 150 mm along the edges of the outer layer of sheathing membrane. (3) Wall sheathing is permitted to be used in lieu of one layer of sheathing membrane required in Sentence (1), and the thickness need not conform to Table 9.23.17.2.-A.

(1) Sheathing membrane is permitted to be omitted beneath cladding when the joints in the cladding are formed to effectively prevent the passage of wind and rain in conformance with Sentence (2) or (3), as applicable. (2) Cladding consisting of sheets of plywood, hardboard, OSB, waferboard or fibre cement is considered to meet the requirements of Sentence (1), provided the cladding is applied so that (a) all edges are directly supported by framing, (b) the vertical joints between adjacent sheets are sealed and (i) covered with battens, (ii) shiplapped, or (iii) otherwise matched to provide weathertight joints, and (c) the horizontal joints between adjacent sheets are sealed and (i) shiplapped, or (ii) otherwise matched to provide weathertight joints. (3) Metal siding consisting of sheets of metal is considered to meet the requirements of Sentence (1) where the joints between sheets are of the locked-seam type.

(1) Flashing shall consist of not less than (a) 1.73 mm thick sheet lead, (b) 0.33 mm thick galvanized steel, (c) 0.46 mm thick copper, (d) 0.46 mm thick zinc, (e) 0.48 mm thick aluminum, or (f) 1.02 mm thick vinyl.

(1) Except as provided in Sentence (2), flashing shall be installed at (a) every horizontal junction between cladding elements, (b) every horizontal offset in the cladding, and (c) every horizontal line where the cladding substrates change and where (i) the substrates differ sufficiently for stresses to be concentrated along that line, or (ii) the installation of the cladding on the lower substrate may compromise the drainage of moisture from behind the cladding above. (See Note A-9.27.3.8.(1)) (2) Flashing need not be installed as described in Sentence (1) (a) where the upper cladding elements overlap the lower cladding elements by not less than 25 mm, (b) where, (i) the cladding above and below the joint is installed outboard of a drained and vented air space, and (See Clause 9.27.2.2.(1)(a)) (ii) the horizontal detail is constructed so as to minimize the ingress of precipitation into the air space, or (c) at horizontal construction joints in stucco, where (i) the joint is finished with an expansion-contraction strip, and (ii) the cladding is installed outboard of a drained and vented air space. (See Clause 9.27.2.2.(1)(a)) (3) Flashing shall be installed over exterior wall openings where the vertical distance from the bottom of the eave to the top of the trim is more than one-quarter of the horizontal overhang of the eave. (See Note A-9.27.3.8.(3)) (4) Flashing described in Sentences (1) and (3) shall (a) extend not less than 50 mm upward inboard of the sheathing membrane or sheathing installed in lieu of the sheathing membrane, (See Article 9.27.3.4.) (b) have a slope of not less than 6% toward the exterior after the expected shrinkage of the building frame, (c) terminate at each end with an end-dam (i) with a height in millimetres not less than 25 mm or 1/10 the value of the 1-in-5 driving rain wind pressure in Pa, and (ii) at the height defined in Subclause (c)(i), extending to the face of the adjacent cladding, (d) lap not less than 10 mm vertically over the building element below, and (e) terminate in a drip offset not less than 5 mm outward from the outer face of the building element below. (See Note A-9.27.3.8.(4)) (5) Where the sills of windows and doors installed in exterior walls are not self-flashing, flashing shall be installed between the underside of the window or door and the wall construction below. (See Note A-9.27.3.8.(5))

(1) Sealant shall be provided where required to prevent the entry of water into the structure. (2) Sealant shall be provided between masonry, siding or stucco and the adjacent door and window frames or trim, including sills unless such locations are completely protected from the entry of rain. (3) Sealant shall be provided at vertical joints between different cladding materials unless the joint is suitably lapped or flashed to prevent the entry of rain. (See Articles 9.7.6.2., 9.20.13.12. and 9.28.1.5.)

(1) Sealants shall be (a) non-hardening type suitable for exterior use, (b) selected for their ability to resist the effects of weathering, and (c) compatible with and adhere to the substrate to which they are applied. (See Note A-9.27.4.2.(1)) (2) Sealants shall conform to (a) ASTM C834, “Standard Specification for Latex Sealants,” (b) ASTM C920, “Standard Specification for Elastomeric Joint Sealants,” (c) ASTM C1184, “Standard Specification for Structural Silicone Sealants,” or (d) ASTM C1311, “Standard Specification for Solvent Release Sealants.” (3) Backer rod shall conform to ASTM C1330, “Standard Specification for Cylindrical Sealant Backing for Use with Cold Liquid-Applied Sealants.” (See Note A-9.27.4.2.(1))

(1) Except as permitted by Sentences (2) to (5), cladding shall be fastened to the framing members or furring members, or to blocking between the framing members. (2) Vertical lumber, stucco lath or reinforcing, vertically applied vinyl siding, vertically applied insulated vinyl siding, and polypropylene siding are permitted to be attached to sheathing only where the sheathing consists of not less than (a) 14.3 mm lumber, (b) 12.5 mm plywood, or (c) 12.5 mm OSB or waferboard. (3) Vertically applied metal siding and wood shingles and shakes are permitted to be attached to the sheathing only where the sheathing consists of not less than (a) 14.3 mm lumber, (b) 7.5 mm plywood, or (c) 7.5 mm OSB or waferboard. (4) Where wood shingles or shakes are applied to sheathing which is not suitable for attaching the shingles or shakes, the shingles or shakes are permitted to be attached to a wood lath not less than 38 mm by 9.5 mm thick securely nailed to the framing and applied as described in Article 9.27.7.5. (5) Cladding, trim and furring members are permitted to be attached to the web fastening strips of flat wall insulating concrete form units using screws in accordance with Sentence 9.27.5.4.(2)

(1) Blocking for the attachment of cladding shall be not less than 38 mm by 38 mm lumber securely nailed to the framing and spaced not more than 600 mm o.c.

(1) Except as permitted in Sentence 9.27.5.1.(4), furring for the attachment of cladding shall be not less than 19 mm by 38 mm lumber when applied over sheathing. (2) When applied without sheathing, furring referred to in Sentence (1) shall be not less than (a) 19 mm by 64 mm lumber on supports spaced not more than 400 mm o.c., or (b) 19 mm by 89 mm lumber on supports spaced not more than 600 mm o.c. (3) Furring referred to in Sentence (1) shall be (a) securely fastened to the framing, and (b) spaced not more than 600 mm o.c.

(1) Nail or staple size and spacing for the attachment of cladding and trim to wood framing, furring members or blocking shall conform to Table 9.27.5.4.-A. (2) Screw size and spacing for the attachment of cladding, trim and furring members to the web fastening strips of flat wall insulating concrete form (ICF) units shall conform to Table 9.27.5.4.-B where the 1-in-50 hourly wind pressure (HWP) is less than or equal to 0.60 kPa. (See Note A-9.27.5.4.(2)) Table 9.27.5.4.-A Attachment of Cladding to Wood Framing, Furring Members or Blocking Forming Part of Sentence 9.27.5.4.(1) Minimum Nail or Minimum Number of Maximum Nail or Type of Cladding Staple Length, mm(1) Nails or Staples Staple Spacing, mm o.c. Wood trim 51 — 600 Lumber siding or horizontal siding made from 51 — 600 sheet metal 600 (nailed to framing) Metal cladding 38 — 400 (nailed to sheathing only) Wood shakes up to 200 mm in width 51 2 — over 200 mm in width 51 3 — Wood shingles up to 200 mm in width 32 2 — over 200 mm in width 32 3 — Vinyl and insulated vinyl siding horizontally applied 38 — 400(2) vertically applied 38 — 300 Polypropylene siding 38 — 400(2) Panel- or sheet-type cladding up to 7 mm thick 38 — 150 (along edges) over 7 mm thick 51 — 300 (along intermediate supports) Notes to Table 9.27.5.4.-A: (1) The minimum fastener length need not exceed the minimum fastener penetration depth required by Article 9.27.5.7. (2) The maximum spacing of 400 mm o.c. applies to nails and staples used to attach horizontally applied vinyl, insulated vinyl and polypropylene siding, unless a greater spacing is permitted in an evaluation report prepared by an accredited certification organization. Table 9.27.5.4.-B Attachment of Cladding to Flat Wall ICF Units where the 1-in-50 HWP ≤ 0.60 kPa Forming Part of Sentence 9.27.5.4.(2) Minimum Screw Minimum Screw Maximum Horizontal Spacing Type of Cladding(1) Length Diameter, mm of Screws, mm o.c.(2) Wood trim (3) 3.5 400 or 450 (screwed to web fastening strip) Lumber siding or horizontal siding made (3) 4.2 400 or 450 (screwed to web fastening strip) from sheet material Metal cladding (3) 4.2 400 or 450 (screwed to web fastening strip) Vinyl cladding (3) 3.5 400 or 450 (screwed to web fastening strip) 400 or 450 (masonry tie screwed to Masonry veneer(4) (3) 4.2 web fastening strip) Panel- or sheet-type cladding up to 7 mm thick (3) 3.5 150 or 200 (along edges) over 7 mm thick (3) 4.2 300 or 400 (along intermediate supports) Notes to Table 9.27.5.4.-B: (1) Wood shakes and wood shingles are permitted to be attached to horizontal wood furring members in accordance with Table 9.27.5.4.- A. The wood furring members shall be attached to the web fastening strips of flat wall ICF units with screws not less than 4.2 mm in diameter spaced horizontally not more than 400 or 450 mm o.c. (two horizontal spacing options are given to accommodate the 150 and 200 mm o.c. horizontal spacing options for web fastening strips). (2) Two horizontal spacing options are given to accommodate the 150 mm o.c. and 200 mm o.c. horizontal spacing options for web fastening strips. The maximum vertical spacing of screws or masonry ties, as applicable, shall be 400 mm. (3) Screws must be long enough to penetrate through the web fastening strips by a minimum of 6 mm. (4) See also Subsection 9.20.5. for requirements on the support of masonry veneer.

(1) Nails or staples for the attachment of cladding and wood trim shall be corrosion-resistant and shall be compatible with the cladding material.

(1) Fasteners for metal cladding shall be positioned to permit expansion and contraction of the cladding. (2) Fasteners for vinyl siding, insulated vinyl siding and polypropylene siding shall be installed in the centre of the slots of the nail hem.

(1) Fasteners for shakes and shingles shall penetrate through the nail-holding base or not less than 19 mm into the framing. (2) Fasteners for vinyl cladding, insulated vinyl cladding and polypropylene cladding shall penetrate through the nail- holding base or not less than 32 mm into the framing. (3) Fasteners for cladding other than that described in Sentences (1) and (2) shall penetrate through the nail-holding base or not less than 25 mm into the framing.

(1) Lumber siding shall be sound, free of knot holes, loose knots, through checks or splits.

(1) Drop, rustic, novelty, lapped board and vertical wood siding shall be not less than 14.3 mm thick and not more than 286 mm wide. (2) Bevel siding shall be (a) not less than 5 mm thick at the top, and (b) not less than (i) 12 mm thick at the butt for siding 184 mm or less in width, and (ii) 14.3 mm thick at the butt for siding wider than 184 mm. (3) Bevel siding shall be not more than 286 mm wide.

(1) Lumber siding shall prevent water from entering at the joints by the use of lapped or matched joints or by vertical wood battens. (2) Siding shall overlap not less than 1 mm per 16 mm width of lumber, but not less than (a) 9.5 mm for matched siding, (b) 25 mm for lapped bevel siding, or (c) 12 mm for vertical battens.

(1) Shingles and shakes shall conform to, (a) CSA O118.1, “Western Red Cedar Shakes and Shingles,” or (b) CSA O118.2, “Eastern White Cedar Shingles.” (2) Western cedar shakes shall be not less than No. 1 or Handsplit grade, and western cedar shingles not less than No. 2 grade, except that No. 3 grade may be used for undercoursing. (3) Eastern white cedar shingles shall be at least B (clear) grade, except that C grade may be used for undercoursing.

(1) Shingles and shakes shall be not less than 65 mm or more than 350 mm wide.

(1) Shingles or shakes shall be fastened with nails located approximately 20 mm from each edge and not less than 25 mm above the exposure line for single-course applications, or approximately 50 mm above the butt for double-course applications.

(1) In single-course application, joints in succeeding courses shall be offset not less than 40 mm so that joints in any 2 of 3 consecutive courses are staggered. (2) In double-course application, joints in the outer course shall be offset from joints in the under-course by not less than 40 mm, and joints in succeeding courses shall be offset not less than 40 mm.

(1) When lath is used with double-course application (See Sentence 9.27.5.1.(4)), it shall be spaced according to the exposure and securely fastened to the framing. (2) The butts of the under-course of the application referred to in Sentence (1) shall rest on the top edge of the lath. (3) The outer course of the application referred to in Sentence (1) shall be fastened to the lath with nails of sufficient length to penetrate through the lath. (4) The butts of the shingles or shakes shall be so located that they project not less than 12 mm below the bottom edge of the lath referred to in Sentence (1). (5) If wood lath is not used, the butts of the under-course shingles or shakes of the application referred to in Sentence (1) shall be located 12 mm above the butts of the outer course.

(1) The exposure and butt thickness of shingles and shakes shall conform to Table 9.27.7.6. Table 9.27.7.6. Exposure and Thickness of Wood Shingles and Shakes Forming Part of Sentence 9.27.7.6.(1) Maximum Exposure, mm Shake or Shingle Length, mm Minimum Butt Thickness, mm Single Coursing Double Coursing 400 190 305 10 450 216 356 11 600 292 406 13

(1) Plywood cladding shall be exterior type conforming to (a) ANSI/HPVA HP-1, “American National Standard for Hardwood and Decorative Plywood,” (b) CSA O121, “Douglas fir plywood,” (c) CSA O151, “Canadian softwood plywood,” or (d) CSA O153, “Poplar plywood.”

(1) Plywood cladding shall be not less than 6 mm thick when applied directly to sheathing. (2) When applied directly to framing or over furring strips, plywood cladding thickness shall conform to Table 9.27.8.2. (3) The thickness of grooved or textured plywood cladding shall be measured at the point of least thickness. Table 9.27.8.2. Minimum Plywood Cladding Thickness Forming Part of Sentences 9.27.8.2.(2) and 9.27.10.2.(2) Minimum Thickness, mm Spacing of Supports, mm Face Grain Parallel to Supports Face Grain at Right Angles to Supports 400 8 6 600 11 8

(1) The edges of plywood cladding shall be treated with a suitable paint or sealer.

(1) Plywood applied in panels shall have all edges supported. (2) Not less than a 2 mm gap shall be provided between panels referred to in Sentence (1). (3) Vertical joints in cladding referred to in Sentence (1) shall be protected with batten strips or sealant when the plywood joints are not matched. (4) Horizontal joints in cladding referred to in Sentence (1) shall be lapped not less than 25 mm or shall be suitably flashed.

(1) Plywood applied in horizontal lapped strips shall have not less than a 2 mm gap provided at the butted ends, which shall be caulked. (2) The horizontal joints of siding described in Sentence (1) shall be lapped not less than 25 mm. (3) Wedges shall be inserted under all vertical butt joints and at all corners when horizontal lapped plywood is applied without sheathing.

(1) Hardboard cladding shall conform to ANSI A135.6, “Engineered Wood Siding.”

(1) Hardboard cladding shall be not less than (a) 9.5 mm thick when applied over sheathing that provides continuous support or over furring or framing members not more than 400 mm o.c., or (b) 11.1 mm thick when applied over furring or framing members not more than 600 mm o.c. (2) Where hardboard cladding is grooved, the grooves shall not extend more than1.5 mm into the minimum required thickness. (See Note A-9.27.9.2.(2))

(1) Hardboard cladding applied in panels shall have all edges supported with not less than a 5 mm gap provided between sheets. (2) Vertical joints in cladding described in Sentence (1) shall be protected with batten strips or sealant when the joints are not matched. (3) Horizontal joints in cladding described in Sentence (1) shall be lapped not less than 25 mm or shall be suitably flashed.

(1) Hardboard applied in horizontal lapped strips shall have not less than a 5 mm gap provided at the butted ends, which shall be sealed or otherwise protected with suitable mouldings. (2) The horizontal joints of siding described in Sentence (1) shall overlap not less than 1 mm per 16 mm width of siding board but not less than 9.5 mm for matched joint siding or 25 mm for lapped siding.

(1) Not less than 3 mm clearance shall be provided between hardboard cladding and door or window frames.

(1) OSB and waferboard cladding shall conform to CSA O437.0, “OSB and Waferboard.”

(1) OSB conforming to O-2 grade shall be not less than 6.0 mm thick where applied directly to sheathing. (2) OSB conforming to O-2 grade applied directly to framing or over furring strips shall conform to the thickness shown for plywood in Table 9.27.8.2. (See Note A-9.27.10.2.(2)) (3) OSB conforming to O-1 grade and waferboard conforming to R-1 grade shall be not less than 7.9 mm thick where applied directly to sheathing. (4) Where applied directly to framing or over furring strips, OSB conforming to O-1 grade and waferboard conforming to R-1 grade shall be not less than (a) 9.5 mm thick on supports spaced not more than 400 mm o.c., and (b) 12.7 mm thick on supports spaced not more than 600 mm o.c.

(1) OSB and waferboard applied in panels shall have all edges supported and treated with a primer or sealer. (2) Not less than a 3 mm gap shall be provided between sheets in cladding described in Sentence (1). (3) Vertical joints in cladding described in Sentence (1) shall be protected with batten strips or sealant when the OSB and waferboard joints are not matched. (4) Horizontal joints in cladding described in Sentence (1) shall be lapped not less than 25 mm or shall be suitably flashed.

(1) Not less than a 3 mm clearance shall be provided between OSB and waferboard cladding and door or window frames.

(1) Steel sheet cladding, including horizontal and vertical strip steel siding, flashing and trim accessories, shall (a) have a minimum thickness of 0.33 mm, and (b) conform to CSSBI 23M, “Standard for Residential Steel Cladding.” (See Note A-9.27.11.1.(1)) (2) Horizontal and vertical strip aluminum siding, including flashing and trim accessories, shall conform to CAN/CGSB-93.2-M, “Prefinished Aluminum Siding, Soffits and Fascia, for Residential Use.” (See Note A-9.27.11.1.(2) and (3)) (3) Aluminum sheet cladding shall conform to CAN/CGSB-93.1-M, “Sheet, Aluminum Alloy, Prefinished, Residential,” and shall have a thickness of not less than 0.58 mm, except that siding supported by backing or sheathing shall have a thickness of not less than 0.46 mm. (See Note A-9.27.11.1.(2) and (3))

(1) Vinyl siding shall conform to ASTM D3679, “Standard Specification for Rigid Poly (Vinyl Chloride) (PVC) Siding.” (2) Insulated vinyl siding shall conform to ASTM D7793, “Standard Specification for Insulated Vinyl Siding.” (3) Rigid vinyl soffits shall conform to ASTM D4477, “Standard Specification for Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit.” (4) Where vinyl siding, insulated vinyl siding or rigid vinyl soffits are required to have a flame-spread rating, the rating shall be determined in accordance with CAN/ULC-S102.2, “Standard Method of Test for Surface Burning Characteristics of Flooring, Floor Coverings, and Miscellaneous Materials and Assemblies.”

(1) The attachment of vinyl siding and insulated vinyl siding shall conform to the requirements in Subsection 9.27.5.

(1) Polypropylene siding shall conform to ASTM D7254, “Standard Specification for Polypropylene (PP) Siding.” (2) Where polypropylene siding is required to have a flame-spread rating, the rating shall be determined in accordance with CAN/ULC-S102.2, “Standard Method of Test for Surface Burning Characteristics of Flooring, Floor Coverings, and Miscellaneous Materials and Assemblies.”

(1) The attachment of polypropylene siding shall conform to the requirements in Subsection 9.27.5.

(1) Except as provided in Sentence (2), this Subsection applies to exterior insulation finish systems (EIFS) that (a) are covered in the scope of CAN/ULC-S716.1, “Standard for Exterior Insulation and Finish Systems (EIFS) – Materials and Systems,” and (b) have a geometrically defined drainage cavity with a minimum cavity depth of 6 mm and an open area equal to not less than 13% of the area of a full-size EIFS panel. (See Note A-9.27.14.1.(1)) (2) EIFS that are not covered by Sentence (1) shall comply with Part 5.

(1) The materials used in EIFS shall conform to CAN/ULC-S716.1, “Standard for Exterior Insulation and Finish Systems (EIFS) – Materials and Systems.” (2) The substrate on which the EIFS is installed shall (a) be compatible with that particular system, and (See Note A-9.27.14.2.(2)(a)) (b) comply with the structural requirements for sheathing materials stated in Section 9.23.

(1) The design of an exterior insulation finish system shall comply with CAN/ULC-S716.3, “Standard for Exterior Insulation and Finish Systems (EIFS) – Design Application.” (2) The installation of an exterior insulation finish system shall comply with CAN/ULC-S716.2, “Standard for Exterior Insulation and Finish Systems (EIFS) – Installation of EIFS Components and Water Resistive Barrier.”