| 9.13.2. |
Dampproofing |
| 9.13.2.1. |
Required Dampproofing
- Except as provided in Article 9.13.3.1., where the exterior finished ground level is at a higher elevation than the ground level inside the foundation walls, exterior surfaces of foundation walls below ground level shall be dampproofed.
- Except as provided in Sentence (3) and Article 9.13.3.1., floors-on-ground shall be dampproofed.
- Dampproofing required in Sentence (2) need not be provided for
- floors in garages,
- floors in unenclosed portions of buildings, or
- floors installed over not less than 100 mm of coarse clean granular material containing not more than 10% of material that will pass a 4 mm sieve.
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| 9.13.2.2. |
Dampproofing Materials
- Materials installed to provide required dampproofing shall be
- capable of protecting assemblies against moisture transfer from the ground,
- compatible with adjoining materials, and
- resistant to mechanisms of deterioration that may reasonably be expected, given the nature, function and exposure of the materials.
- Except as otherwise specified in this Section, materials used for exterior dampproofing shall
- conform to one of the following standards:
- ASTM D 1227, "Emulsified Asphalt Used as a Protective Coating for Roofing," Type III, Class I,
- ASTM D 4479/D 4479M, "Asphalt Roof Coatings - Asbestos-Free," Type III,
- CAN/CGSB-51.34-M, "Vapour Barrier, Polyethylene Sheet for Use in Building Construction," or
- CAN/CSA-A123.4, "Asphalt for Constructing Built-Up Roof Coverings and Waterproofing Systems,"or
- have a water vapour permeance of not more than 43 ng/Pa·s·m2 when tested in accordance with Procedure A (wet cup) of ASTM E 96/E 96M, "Water Vapor Transmission of Materials," and consist of one of the following material types:
- a vapour-resistant coating,
- a cold-fluid-applied or hot-rubberized bituminous dampproofing membrane,
- a liquid-applied or spray-applied asphalt-based emulsion dampproofing, or
- a type III hot-applied asphalt.
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| 9.13.2.3. |
Preparation of Surface
- The area in which dampproofing is to be carried out shall be kept free of water during the application and curing of the dampproofing system.
- The surface to be dampproofed shall be prepared in accordance with the instructions of the dampproofing material manufacturer.
- Where the dampproofing material is to be applied on insulating concrete form (ICF) walls, the instructions of the ICF wall manufacturer shall be followed.
- Unit masonry walls to be dampproofed shall be parged on the exterior face below ground level with not less than 6 mm of mortar conforming to Section 9.20. coved over the footing.
- Concrete walls to be dampproofed shall have holes and recesses sealed with cement mortar or a mastic or sealant that is suitable for vertical applications and compatible with the dampproofing material.
- The surface required to be dampproofed shall be clean and dry and free of ice, snow, frost, dust, dirt, oil, grease, cracks, projections and depressions, loose particles and debris that could be detrimental to the performance of the material to be applied.
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| 9.13.2.4. |
Application of Dampproofing Material
- Exterior dampproofing shall be applied from finished ground level to the top of the exterior of the footing.
- Unless otherwise stated in this Subsection, dampproofing shall be installed in accordance with the manufacturer's instructions with regard to
- surface priming,
- conditions during application,
- application quantity and rate, and
- curing times.
- Joints, cracks and penetrations shall be sealed to maintain the continuity of the dampproofing, where the dampproofing material is not capable of bridging such discontinuities.
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| 9.13.2.5. |
Moisture Protection for Interior Finishes
(See Note A-9.13.2.5.)
- The interior surface of foundation walls below ground level shall be protected by means that minimize the ingress of moisture from the foundation wall into interior spaces, where
- a separate interior finish is applied to a concrete or unit masonry wall that is in contact with the soil, or
- wood members are placed in contact with such walls for the installation of insulation or finish.
- Except as provided in Sentence (3), where the protection of interior finishes required in Sentence (1) consists of membranes or coatings,
- the membrane or coating shall extend from the basement floor surface up to the highest extent of the interior insulation or finish, but not higher than the exterior finished ground level, and
- no membrane or coating with a permeance less than 170 ng/(Pa·s·m2) shall be applied to the interior surface of the foundation wall above ground level between the insulation and the foundation wall.
- Where insulation functions as both moisture protection for interior finishes and as a vapour barrier in accordance with Subsection 9.25.4., it shall be applied over the entire interior surface of the foundation wall.
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| 9.13.2.6. |
Dampproofing of Floors-on-Ground
- Where dampproofing is installed below the floor, it shall consist of
- polyethylene not less than 0.15 mm thick with joints lapped not less than 100 mm,
- type S roll roofing with joints lapped not less than 100 mm, or
- rigid extruded/expanded polystyrene with sealed or ship-lapped joints that has
- sufficient compressive strength to support the floor assembly, and
- a water vapour permeance complying with Clause 9.13.2.2.(2)(a).
- Where dampproofing is installed between a floor-on-ground and a finished floor, it shall consist of
- rigid extruded/expanded polystyrene with sealed or ship-lapped joints that has
- sufficient compressive strength to support the floor assembly, and
- a water vapour permeance complying with Clause 9.13.2.2.(2)(b), or
- polyethylene not less than 0.05 mm thick with joints lapped not less than 100 mm.
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