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6 Cards in this Set
- Front
- Back
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What are the main reasons basement walls may fail? |
Frost action on walls, swelling clay, frost action on footings, high water table, presence of water-borne soluble salts |
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The primary path for shedding water over the ground should be away from the building. If water is able to get below grade adjacent the foundation what are the 2 lines of defense to protect the foundation from water penetration ? |
1st - exterior surface of the insulation (which provides a continuous means of managing water from the ground surface down tot he gravel and drainpipe (weeping tile) at the footing. 2nd - exterior surface of foundation wall / dampproofing. |
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According to the NRC can EPS insulation types provide protection from water ingress in foundation wall applications? |
yes, They are not classified as draining materials but they were able to handle water movement at their outer face when tested by the NRC |
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According to testing done by the NRC can dampproofing be omitted if using SPF to insulate the foundation and footings? |
Yes, Testing found that the foam produced a continuous protective layer over the wall, footing and joint |
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What techniques can be used to prevent the ingress of water between adjacent insulation boards? |
Tightly installed butt joints and/or the use of ship-lap edges. |
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What can be done to ensure the positive slope away from a building is maintained throughout the buildings life? |
Steeper initial grades More reliable means of diverting surface water Proper Backfill compaction. |
