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Masons Fibre Cement Soffit

Masons fibre cement sheets are 4.5mm thick and used as a soffit lining for external eaves and verge projections.

Masons 4.5mm fibre cement soffit lining is a non-structural, lightweight, smooth, flat sheet. It is manufactured from Portland cement, crystalline silica, fly ash and cellulose pulp and is defined as non-combustible in accordance with BS 476-4. Once coated with a paint system it is resistant to moisture and rot.

Key Features
  • Lightweight, smooth, flat sheet
  • Defined as non-combustible in accordance with BS 476-4

Available sheet size:

  • Length: 2440mm
  • Width: 600mm
  • Thickness: 4.5mm
NZ-Owned Business
NZ-Owned Business
Scope of Use


  • In wind zones up to and including extra high, as defined in NZS 3604:2011 or a maximum permissible ultimate limit state (ULS) of 2.1 kPa
  • In all corrosion zones as defined in NZS 3604:2011
  • Any proximity to the relevant boundary
Limitations on Use


  • Where installed within 1 m of a relevant boundary, the balance of the roof, eave and wall structure must meet the relevant fire-related building code obligations


  • On buildings where the primary roof structure complies with the New Zealand Building Code (NZBC) or for an existing roof structure where the designer and installer are satisfied that the existing framing is suitable for the intended building work
  • In conjunction with timber or light weight steel framing
NZS 3604 Corrosion Zone B suitable
Corrosion Exposure Zone B
NZS 3604 Corrosion Zone C suitable
Corrosion Exposure Zone C
NZS 3604 Corrosion Zone D suitable
Corrosion Exposure Zone D
NZS 3604 Wind Zone Extra High suitable
Extra High Wind Zone
Statement of Building Code Compliance

If designed, installed and maintained in accordance with all Masons Plastabrick’s requirements, the Masons 4.5 mm fibre cement soffit lining will comply with or contribute to compliance with the following performance claims:

B1 Structure: B1.3.1, B1.3.2, B1.3.3 (a, h, j, m & q), B1.3.4 (a, b, c, d)

  • Chemical & Metallurgical Services, Chennai. IS: 14862, ASTM D-1032, IS: 2380, ASTM C1185. Testing for tensile strength, compressive strength, screw withdrawal strength, density, modulus of rupture [03/2017].

B2 Durability: B2.3.1 (b)

  • Chemical & Metallurgical Services, Chennai. IS: 14862, ASTM D-1032, IS: 2380, ASTM C1185. Testing for Freeze/Thaw [03/2017].

C3 Fire affecting areas beyond the fire source: C3.7 (a

  • TUV SUD PSB Pte. Ltd. BS 476: Part 4: 1970 [03/2015].

E2 External Moisture: E2.3.2, E2.3.3, E2.3.5, E2.3.7 (a, b, & c

  • Chemical & Metallurgical Services, Chennai. IS: 14862, ASTM D-1032, IS: 2380, ASTM C1185. Testing for water permeability, absorption, soaking [03/2017].

F2 Hazardous Building Materials: F2.3.1

  • Ramco Hicem Fibre cement board safety data sheet [28/05/2020].
B1 Structure compliant
B2 Durability compliant
C Protection from Fire compliant
Protection from Fire
E2 External Moisture compliant
External Moisture
F2 Hazardous Building Materials compliant
Hazardous Building Materials
Design & Installation Guide


PASS Product Statement


Care & Maintenance Guide


Product Warranty


CAD/PDF Details
Boxed Soffit Direct Fix


Boxed Soffit Cavity


Raking Soffit Direct Fix


Raking Soffit Cavity


Nailing Pattern


UPVC Joint


Express Joint


Butt Joint


Cross Section Soffit Direct Fix


Gable End


Since being established in 1999, Masons has become a key supplier in the New Zealand building industry, offering a variety of quality products and tools for a whole range of building requirements.

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