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Solutions for H1 compliance

Last month's edition of Trade Leader covered upcoming changes to the H1 Building Code. Now's the time to start implementing changes to ensure New Zealand homes and buildings are built to high energy efficiency standards. 

One way to do this is using Knauf Insulation’s ecoinsulation® glasswool range, which provides flexibility for builders and designers when using calculation methods of design, essential in the H1 Building Code. They have new solutions for Ceilings, Skillion Roofs, Walls and Underfloor insulation which will assist meeting R-values for various applications, which may be different in varying climate zones. 

Steve Smith, Knauf’s Specification & Regulatory Affairs Manager, discussed with Trade Leader the new insulation solutions of ecoinsulation® glasswool that will be available from November for residential applications.

Roofs

R-VALUES

Previous R2.9 to R3.3 dependant on climate zone

New R6.6 across all climate zones

Ceilings

R7.0 ecoinsulation® glasswool Ceiling Batt (New)
Thickness 330mm / Width 460mm / Length 1200mm

Designed for use in cold roof applications where pitched roofs are insulated at ceiling level. This gives a high thermally performing single layer insulation solution suitable for 90mm and 140mm joists/truss chords at 1200, 900 and 600 framing centres. The single layer insulation batt brings significant benefits compared to installing a double layer system:

  • Less material needed on site.
  • Quicker to install, therefore less cost

Skillion Roofs

R5.0 ecoinsulation® glasswool Skillion Batt (New)
Thickness 165mm / Width 430mm / Length 1160mm

R6.0 ecoinsulation® glasswool Skillion Batt (New)
Thickness 215mm / Width 430mm / Length 1160mm

R7.4 ecoinsulation® glasswool Skillion Batt (New)
Thickness 265mm / Width 430mm / Length 1160mm

Able to be used in warm skillion roofs where the roof is insulated at rafter level, offering a combination of excellent thermal and acoustic performance. Glasswool insulation is fitted below rafters suitable for 1200, 900 and 600mm framing centres. 

Walls

R-VALUES

Previous R1.9 to R2.0 dependant on climate zone

New R2.0 across all climate zones

The ecoinsulation® glasswool wall batts already meet current and new standards, but now include additional products to meet evolving requirements.

R1.3 ecoinsulation® glasswool Wall Batt (New)
Thickness 45mm / Width 580mm / Length 1160mm

The R1.3 batt supplements insulation installed between studwork by providing an additional thin high performing layer of insulation to the inner side of the studwork.

R4.4 ecoinsulation® glasswool Wall Batt (New)
Thickness 140mm / Width 580mm / Length 1160mm

A super high performing insulation batt designed for use in 140mm timber frame applications between studwork.

Underfloor

R-VALUES

Previous R1.3 across all climate zones

New R2.5 to R3.0 dependant on climate zone

R3.0 ecoinsulation® glasswool Floorshield batt (New)
Thickness 105mm / Width 430mm / Length 1160mm

Manufactured from durable silicone coated glasswool and faced with an ECOSE® glass veil which acts as a wind-wash barrier. This barrier provides protection from air movement under the floor to ensure the insulation will perform as per the R-value.

Compliance Methods

Smith also notes that there are actually three methods for compliance with the Building Code:


  1. The Schedule Method – Meet the minimum R-values provided.

  2. The Calculation Method – Meet the whole building Heat Loss parameter by calculating overall heat loss from all building envelope elements. Allow trading off between elements so you can use higher R-values for some and lower for others.

  3. The Modelling Method – a calculation of the energy demand for the whole building using whole building calculation software.

Whatever way compliance is calculated, technical help to guide you through your next project is available. Contact your CARTERS representative who will be happy to help.

For more information on the H1 regulations, read our latest Trade Leader articles

www.carters.co.nz/H1-roadshow

New Regulation for Energy Efficient Build - Trade Leader August - September 2022

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