INSULATION - WALLS

(R Values listed below are for entire wall unit – Minus internal linings and internal Air Gap)
  • Temporary – roof perimeter guard rail (Where there is a possibility of falling 3m or greater) W.A Code of Practice for the prevention of falls in the workplace – 2004
  • Subcontract labour – Roof Plumber
  • Roof - steel corrugated - colorbond - 0.42mm BMT
  • Roof sheeting - barge capping steel - 0.55mm BMT extra for barge cap in steel – colorbond
  • Roof sheeting - ridge / hip capping steel - 0.55mm BMT extra for ridge/hip cap in steel – colorbond
  • Roof insulation blanket – Bradford Anticon 60 - glasswool - blanket - R 1.3 - 60mm thick
  • Sarking – Bradford Thermoseal – Starter strip
Each part of an external wall in climate zone 5 with a Wall Surface Density less than 220 kg/m2 must:
  • OPTION A: achieve a minimum Total R-Value of 2.8; or
  • OPTION B: achieve a minimum Total R-Value of 2.4; and
Shade the external wall of the storey with a verandah, balcony, eaves, carport or the like, which projects at a minimum angle of 15 degrees. All roof pitches governed by AS1684 comply.
  • OPTION B: Each part of an external wall in climate zone 5 with a Wall Surface Density greater than or equal 220 kg/m2 (Double Brick Cavity/Masonry construction) must:

+ shade the wall with a verandah, balcony, eaves, carport or the like that projects at a minimum angle of 15 degrees. Only a Metal roof with pitch 23.75º or less/Tiled roof with pitch 25.63º or less with 3 Brick course Drop off eaves Comply.+ incorporate insulation with an R-Value of greater than or equal to 0.5;+ have external glazing that complies with 3.12.2.1 with the applicable value for CSHGC in Table 3.12.2.1e reduced by 15%; and have a concrete slab floor.
Information obtained from: NCC 2019 Volume 2 – Part 3.12.1.4 Energy Efficiency

BRICK VENEER (BUDGET)

  • Kingspan AIR-CELL Permicav XV or Permishield 65 + Bradford Gold Batts Hi-Performance Wall Insulation R2.7 – (Summer Heat Flow in R-Value: 3.62 – Winter Heat flow out R-Value: 4.02)

BRICK VENEER (BEST PRACTICE)

  • Kingspan Kooltherm K12 Framing Board Insulation) – 40mm Thick Board - (Summer Heat Flow in R-Value: 3.6 – Winter Heat flow out R-Value: 3.9)

DOUBLE BRICK CAVITY (BUDGET)

  • Kingspan AIR-CELL Permicav XV - (Summer Heat Flow in R-Value: 1.8 – Winter Heat flow out R-Value: 2.0)

DOUBLE BRICK CAVITY (BEST PRACTICE)

  • Kingspan Kooltherm K8 Cavity Board – 40mm Thick Board - (Summer Heat Flow in R-Value: 3.1 – Winter Heat flow out R-Value: 3.2)

CLADDED WALL WITH COUNTER CAVITY BATTEN (BUDGET)

  • Bradford Thermoseal Wall Wrap XP + Bradford Gold Batts Hi-Performance Wall Insulation R2.7 - (Summer Heat Flow in R-Value: 3.32 – Winter Heat flow out R-Value: 3.72)

CLADDED WALL WITH COUNTER CAVITY BATTEN (BUDGET)

  • Kingspan Kooltherm K12 Framing Board Insulation) – 40mm Thick Board - (Summer Heat Flow in R-Value: 3.5 – Winter Heat flow out R-Value: 3.7)

INSULATION USED AS CLADDING SUBSTRATE (BuildItEco Thermawall Including double sided reflective Sarking (Direct Fix)

  • 100mm Thick Orange Board - (Summer Heat Flow in R-Value: 3.25 – Winter Heat flow out R-Value: 3.41)

INSULATION USED AS CLADDING SUBSTRATE (BuildItEco Thermawall Including double sided reflective Sarking (Batten Cavity Fix – BEST PRACTICE)

  • 100mm Thick Orange Board - (Summer Heat Flow in R-Value: 3.41 – Winter Heat flow out R-Value: 3.57)
Batt Insulation and Wall Wraps Pricing and R-Value Chart
Exterior and Cavity Insulation Pricing and R-Value Chart
Note: Refer to tables above for Material cost of selected Wall assembly insulation systems and achievable R Values. We have only selected systems that incorporate a vapour permeable, reflective radiant barrier with Bulk insulation. Radiant Barriers rely on a 25mm insulating air gap to be efficient, and must be kept clean from any dust or debris. Although higher R-values can be achieved on paper utilising a combination of reflective sarking and high performance wall batts, it should be noted that the R-Value does not take into account the loss of R-value of the wall system as a result of Timber/steel framing members.
Best Practice Note - Paying special attention to air sealing the building envelope is crucial in ensuring your home maintains a healthy indoor air quality, and greatly improves the overall total R-Value of your insulation system. When deciding which insulation option to choose (Budget or Best Practice) the U-values of glazing and and its framing needs to be considered, as up to 40% of a home’s heating energy can be lost and up to 87% of its heat gained through windows.