Penetration of water in buildings


Equally, rain-splash or the pooling of surface water might cause damp here. Partial treatment at first floor level including any gables may be more acceptable, though, aesthetically than a wholesale covering. Although remedial action should ideally involve the removal of inappropriate cement pointing and renders or modern paints entrapping moisture, this may cause further damage to the fabric and trials are always recommended. Scientific analysis aids diagnosis but interpreting results demands care, and the importance of the human senses must not be undervalued. Such a system would obviously have the practical disadvantage of being suitable only for the treatment of outside walls and would be impractical where other buildings are close by or where a building has shallow footings. Rain penetration occurs through a number of different mechanisms:
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Building Envelope Water & Moisture Management

For example, replacing cleft shingles with the same, rather than sawn ones, will ensure both a close visual match and better resistance against rain penetration because the surface fibres suffer less disruption, with the grain tending to shed water quicker. Roofs, chimneys, parapets and other exposed parts of buildings are most susceptible to rain penetration, especially where access for maintenance is difficult. Basic exterior wall types There are primarily three basic exterior wall types used for commercial building enclosure design and construction in the United States: Water blown against a windward wall and thrown by air turbulence onto side walls produces an accumulation of water on the building exterior. The space must, however, be closed at all corners of the building to prevent air from going around the corner to feed the high suctions that occur on the adjacent wall face. Mass walls rely on wall thickness, storage capacity and drying to prevent rainwater penetration.
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CBD Rain Penetration and its Control - NRC-IRC

Even when water is available and an opening exists, leakage will not occur unless a force or combination of forces is available to move the water through the opening. Skill and new sealing materials can all be employed, but it is seldom possible to guarantee that no openings will develop to permit the passage of water. It also permits the better positioning of insulation and minimizes the risk of condensation within the wall. With the British climate it is no surprise that the penetration of rain into buildings is often a problem. Foams are being heavily marketed at present but can promote serious decay by effectively 'wet poulticing' timbers.
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Penetration of water in buildings
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Penetration of water in buildings
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CBD-40. Rain Penetration and its Control

Penetration of water in buildings



Description: For example, replacing cleft shingles with the same, rather than sawn ones, will ensure both a close visual match and better resistance against rain penetration because the surface fibres suffer less disruption, with the grain tending to shed water quicker. Smaller holes lower down a roof will tend to admit more water than larger ones higher up. Even when water is available and an opening exists, leakage will not occur unless a force or combination of forces is available to move the water through the opening. As noted in the Construction Waterproofing Handbook by M. The success of the traditional walls shown in Figure 2 is explained by this principle.

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