Low Energy House - About House Insulation - Home Insulation
In order to maintain comfortable conditions inside a house, without wasteful use of the heating system, the insulation in the roof, external walls and ground floor must provide a continuous barrier to the passage of heat to the external air
House Insulation - Loft Insulation
Loft insulation is required to delay the escape of warm air, from the heated parts of the house, through the roof. Typically, loft insulation is installed in two layers.
The first layer is laid between the timber joists at the loft floor level. Because heat can be lost through the joists themselves a second layer of insulation is laid across the top of the joists, at right angles to them.
House Insulation - Rafter Insulation
To create a heated room in a roof space, roof insulation will be required. Because heat can be lost by conduction through the roof timbers themselves, additional insulation is required above or below the rafter line. The relative thicknesses of the two insulating layers will depend on the thermal value of the selected insulating material.
House Insulation - Insulated Cavity Walls
Cavity wall insulation must be installed to delay the escape of warm air, from the heated parts of the house, escaping through the external walls. In recent years, because Building Regulations have demanded higher standards of thermal insulation in buildings, wider cavities have been created to accommodate more thermal insulation.
House Insulation - Suspended Ground Floor Insulation
In suspended timber ground floor construction, care is needed to minimise the draughts from the ventilated space beneath the floor. Timber battens and ply board supports, or proprietary netting supports, are constructed between the joists. Quilt, loose fibre or rigid board insulating material is then laid on the supports. To prevent air movement through the floor, an airtight breather membrane
is fixed to the underside of the joists and turned up at the edges.
House Insulation - Solid Ground Floor Insulation
Concrete ground floors can have high density rigid board insulation fitted above the concrete slab or below the concrete slab. If insulation is installed above the slab, the building will heat up and cool down quickly in response to the heating system. If the insulation is installed below the slab the thermal capacity of the building will be increased and the solid floor structure will absorb heat and release it into the rooms gradually over a period of time.
Existing House Insulation - Loft Insulation Materials
If the existing loft insulation material is in good condition it can be left in place and a layer of top up loft insulation can be added to it to bring the thickness up to the level of the top of the joists. A further layer of loft insulation material can be laid across the joists at right angles to reduce heat loss through the joists themselves. The top layer of insulation should have a minimum thickness of 200mm (8 inches).
Existing House Insulation - Cavity Insulation
Cavity insulation involves the mechanical injection of a suitable insulation material into the wall cavity of an existing house. Holes are drilled into the joints of the outside brickwork and the insulation material is blown into the cavity, via an injection nozzle, until it completely fills the void. When the injection process is finished the holes are made-good to match the existing mortar as closely as possible.
It is essential to find the most effective way of insulating external building elements to the highest affordable standard. In addition to the environmental benefits of energy saving, and reduced carbon dioxide emissions, insulation will increase comfort inside the dwelling
Low Energy House - House Insulation - Home Insulation