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  1. Insulation to suspended floor, accessible from below.

    Detail for insulation to a suspended timber floor, accessible from below, to increase thermal efficiency and reduce heat loss.

    Target Values U-Value : 0.2W/m2K

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  2. Insulation to suspended floor, thin joists, membrane below.

    Detail to show floor insulation, laid between floor joists, to insulate a suspended ground floor. Applicable where the existing joists are not deep enough to accommodate a minimum 200mm of woodfibre installation; or not deep enough to achieve the target U-value for the floor. Additional timber is fixed to bottom of the existing joists to increase their depth and allow the fixing of a breathable membrane to the underside.

    Target values: U-value: 0.28W/m2k

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  3. Floor insulation to cover joists

    Detail to show application of insulation to an internal floor with shallow or thin joists; with rigid insulation beneath to cover joists and improve airtightness. Applicable for deep suspended internal floors, or ground floors over an undercroft of cellar where the floor is accessible from beneath.

    Target U-value: U-value: 0.2W/m2k.

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  4. Stand Alone External Floor insulation to Perimeter

    Detail for stand alone perimeter insulation to edge of ground floor on outer face of external wall. Designed to insulate an existing solid floor by providing sufficient perimeter insulation to footings in order to mitigate cold bridging through the external wall.

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  5. Ground floor ventilation to insulated floor

    Detail for the ventilation of an insulated suspended timber floor. Required where any existing air-bricks to the sub-floor void would be blocked by the installation of floor insulation. A periscopic vent is used to ensure a continued clear air-path to sub-floor, to ensure adequate ventilation.

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  6. Sub floor+Perimeter insulation, vented-shallow suspended floor.

    Detail for insulation of a suspended timber floor, where the existing floor void is not accessible from below, and it is not possible to lift the whole floor to insulate from above.

    This solution proposes a aggregate insulation infill laid over the sub-floor, with a controlled air inlet for ventilation. This ventilation below the floor allows the air in the internal floor void to be controlled, ensuring reduced risk of condensation and humidity build up within the sub-floor.

    In order to mitigate thermal bridging through the external wall, external perimeter insulation is provided to the depth of the building footings/ or 600mm below ground level (as appropriate).

    Target floor U-value: 0.45w/m2K

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