Underfloor insulation is designed to lessen heat loss and prevent drafts. Products and options are often suitable for ‘retro fitting’ by qualified and experienced insulation installers. As with all insulation installations, costs, health and safety issues need to be considered. Appropriate clothing, tools and installation procedures must be used when installing any underfloor insulation. Safety procedures related to electrical wiring, working in confined spaces, dust and other possible problems need to be adhered to.

Underfloor insulation is probably not as big a heat and energy saver as ceiling and wall insulation, however insulating floors does contribute a warmer house during winter months and given appropriate access can be fairly simple to have installed.


Under floor insulation can also help lower noise levels, products that are made from a low destiny flexible polyethylene foam sandwiched between two layers of aluminum foil can be fitted when building or retro – fitted.

Foil that is a concertina style can be attached to the joists is also available. These foil based products are said as being easier to fit than many bat style products for the home handyman.

H owever we have found that foam or polystyrene panels are also available that a concertina edge to allow easy fix. Reports on these products seem positive

Underfloor insulation can perform two tasks

  • lessen heat loss
    although heat loss through floors is not as great as other heat loss areas, by placing insulation under floors you can easily add to the overall efficiency of home insulation
  • help stop drafts through cracks and joins in timber floors.
    drafts are a major cause of heat loss, underfloor insulation can go a long way to prevent drafts

Types of underfloor insulation
Three main types of underfloor insulation options are:

  • polystyrene insulation panels of batts
  • fibreglass or polyester batts
  • aluminium foil

Installing underfloor insulation

  • Consult with your local council for details of any building regulations relating to underfloor insulation.
  • Obtain at least 3 quotes from reputable installers and discuss options and benefits of particular under floor insulation products in relation to you particular home and insulation requirements.
  • Consider ease of access. Depending on the product underfloor insulation can be easy to install given appropriate access. About 400mm -500mm gap between floor and ground is usually good access, any less and the job becomes more difficult, especially.
  • Safety concerns need to be considered, electrical wires are located under most floors so precautions need to be taken. We recommend using a suitably qualified and experienced contractor who uses appropriate tools and techniques.