Protective Measures for Housing on Gas-contaminated Land: by Roger Johnson

By Roger Johnson

A realistic consultant to stable perform for the detailing and building of passive soil gasoline protecting measures for brand new and latest residential improvement. the most gases thought of are methane, carbon dioxide and combos of the 2.

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Protective Measures for Housing on Gas-contaminated Land: (BR 414)

A realistic advisor to sturdy perform for the detailing and building of passive soil gasoline protecting measures for brand spanking new and latest residential improvement. the most gases thought of are methane, carbon dioxide and combos of the 2.

Extra info for Protective Measures for Housing on Gas-contaminated Land: (BR 414)

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A layer of sacrificial polyethylene could be used. 1 Gas membrane NOT suitable as a damp-proof course Some gas membranes do not comply with the appropriate British Standards for damp-proof courses and should not be used to resist damp penetration. The manufacturer of the gas-resistant membrane will be able to advise if the membrane is suitable to perform as a damp-proof course and complies with the appropriate British Standards. This detail illustrates how a gas-resistant membrane which should not be used to resist damp penetration can be used in conjunction with a separate approved damp-proof course.

53 54 9 Specific details – gas drains in granular blankets The performance of granular blankets can be improved in large plan area buildings if slotted or perforated pipes are laid as gas drains within the blanket. However, gas drains have no significant effect and can impair performance owing to short-circuiting if laid in buildings of small plan area, for example a typical low-rise house. A gas drainage layout should: ● avoid short-circuits between opposite faces of the building; ● encourage a uniform flow of clean air throughout the whole area of the granular blanket; ● minimise the flow path through the granular blanket The perforated pipes should be: ● minimum diameter 100 mm; ● slot size 2 to 6 mm; ● open surface area 10 to 15%.

Check that the foundation is adequate. Widen and/or underpin the foundation if necessary. 2 Form a new opening in the existing supporting wall for the new straight-through ventilator or air-brick with sleeve. Seal around ventilator with polyurethane foam sealant. 3 Seal existing periscope vent. 4 Construct new in-situ reinforced concrete suspended slab over proprietary geocomposite drainage blanket or expanded polystyrene void former. 5 Sand:cement fillet. 6 Gas-resistant membrane. 7 Gas-resistant membrane tucked into chase cut in the existing wall and sealed with a suitable gun-applied sealant.

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