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Milbank Air Mattress Safety Systems

The building regulations reproduced below are believed correct at date of posting - (Dec 2000).

Part C of the Building Regulations (Site Preparation and Resistance to moisture) states that the ground to be covered should be reasonably free from vegetable matter and that a suspended concrete floor should incorporate:

• Damp proof membrane (to be provided if the ground below the floor has been excavated below the lowest level of the surrounding ground and will not be effectively drained)
  
  
• Ventilated air space -in those situations where there is a risk of an accumulation of harmful gases.
  
  
• Where ventilation (referred to above) is provided, two opposing external walls should have ventilation openings placed so that the flow of air will have a free path under the floor.

Where there is a likelihood of upward ground movement (e.g. clay heave), adequate space should be provided to accommodate the movement.

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• Ground Preparation
• Thermal Insulation
• Sound Insulation
• PS Hollowcore Plank Screed
• RC Hollowcore Plank Screed
• Beam and Block Screed

OTHER PAGES
• Thermal properties calculator

The thermal transmission (U value) of a floor depends upon the type of floor finish, floor size and insulation employed. The simplest and most effective way of providing the necessary insulation to prestressed concrete floors is to place it above the structural floor and below the finishes.

To calculate the heat loss through a precast ground floor slab, use the online thermal properties guide calculator based upon The Precast Flooring Federation’ publication on "Building Regulations (Part L) Thermal Requirements.

When used at upper floor levels, concrete floors act as a thermal store, especially when under-floor-heating systems are used, this can reduce heating costs.

Milbank Reinforced Hollowcore Planks used at ground floor level can be supplied with polystyrene insulation bonded to the underside of the slab. Alternatively the necessary insulation can be placed on top of the structural floor below the finishes.

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Thermal Properties Guide Calculator

Approved Document E 1992 (Resistance to the passage of sound,) requires that a floor separating dwellings must meet minimum base mass requirements, depending upon the type of surface finishes.

Where RC Planks are used in separating floors between dwellings, a directly bonded screed may beed to be applied. See the section on floor types below.

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Type 1 Floors can be achieved by applying a directly bonded screed as indicated below.

Type 2 Floors; PS-250, RC-225, PS-200 and PS-150H units all have self weights in excess of 300 kg/m² and therefore do not require additional screed to comply with Type 2 Floors.

*Density of sand/cement screed taken as 20kg/m² per 10mm thickness. However, the actual minimum thickness of the additional screed should comply with current best practice.

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In Detail

• PS Hollowcore Type 1 Floors
• PS Hollowcore Type 2 Floors

• RC Hollowcore Type 1 Floors
• RC Hollowcore Type 2 Floors

Where Milbank Beam and Block floors are to be used in separating floors between dwellings, a directly bonded screed must be applied to the beam and block floor as set out in the table below.

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• Type 1 Floors
• Type 2 Floors