Existing Homes

Insulation (retrofitting) to your home

Installing additional insulation in Wellington to your house is an effective way to reduce your energy bills and maintain more comfortable temperatures inside throughout the year.

Go2Insulation will conduct an energy assessment to determine how much insulation you currently have in your underfloor and ceiling and discuss solutions to address any insulation deficits.

The EECA has recommendations and guidelines that Go2Insulation follows. In your ceiling top up layer, the Energy Efficiency and Conservation Authority (EECA) recommends adding a “top up layer of insulation if there is some insulation up there, but it:
- is less than 12 cm thick (i.e. should be thicker than the height of the ceiling joists)
- doesn’t cover the whole ceiling
- has gaps in it, or places where it is squashed or tucked in”

Determining how much, if any, ceiling insulation you have

Insulation is rated according to its effectiveness, or R-value (thermal resistance). A higher R-value tells you that the insulation is better at preventing heat loss than insulation with a lower R-value. Use the table below to find recommended minimum R-values for retrofitting ceiling insulation in existing homes.
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Choosing your ceiling insulation

Follow the guidelines below in selecting insulation for your ceiling:
  • Fit for purpose; intended for installation in roofs or ceilings
  • A high R-value; the higher the better
  • The correct width; consider the spacing of ceiling joists, roof trusses or rafters if you are insulating in between
  • For skillion roofs, the right thickness is important; keep a 25mm gap between the insulation and the roof underlay
  • Compliant with Standard AS/NS 4589.1; look for the statement of compliance on the insulation packaging
  • GO2 not only adheres to EECA standards, but generally goes above them

Determining how much underfloor insulation you need

Insulation should be installed under your floor, either placed between the underside of the joists or stapled to the underside of the joists. Repair existing insulation or remove it and replace it with new insulation if any of the following describe the current condition of your underfloor insulation:
  • it is loose or isn’t flat against the underside of the floor boards
  • doesn’t extend under all of the floor
  • there are gaps in the coverage or pieces are missing
  • foil has taped seams that have come apart
  • evidence of damage is visible
  • GO2 not only adheres to EECA standards, but generally goes above them

Choosing your underfloor home insulation in Wellington

Bulk underfloor insulation is recommended with a minimum R-value of R1.4 for existing homes, no matter where you live in New Zealand. Bulk insulation can be made from polyester, wool, polysteryene, fiberglass or other materials. If your location is damp or windy, make sure the product you choose has been tested for effectiveness and durability in those conditions. Avoid using products with ridges that could produce air gaps between the bottom of the floor and the top of the insulation.
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