GP cement + hydrated lime repointing mortar

Boral Australia's GP cement (marketed as Boral Builders Cement or Boral GP Cement) combined with Boral Hydrated Lime for site-mixed repointing mortar on Class 2 strata building facades. Boral GP Cement conforms to AS 3972 (Type GP), providing consistent compressive strength and workability. When blended with Boral Hydrated Lime at a 1:1:6 (cement:lime:sand) ratio by volume, the mix produces an AS 3700 M3 class mortar — the standard specification for external face brick and concrete masonry repointing. A 1:2:9 ratio produces a softer M4 class mortar for less exposed locations. Boral products are available in 20 kg and 40 kg bags through Boral trade centres, Bunnings Warehouse, Mitre 10, and independent masonry merchants across all states and territories. Boral operates cement grinding facilities and lime production nationally, providing consistent and reliable supply. The correct mix proportion must be confirmed with the engineer, as the mortar designation must match or be softer than the existing brick unit. A cured trial panel (minimum 28 days) is mandatory before approving colour match.

Cement Australia GP Cement (now part of the Holcim group following the Holcim/Lafarge and subsequent Hanson acquisitions) combined with hydrated lime for site-mixed repointing mortar on Class 2 strata facades. Cement Australia operates clinker and grinding facilities in Queensland and New South Wales, with distribution across eastern Australia through the Cement Australia, Holcim, and former Hanson trade supply networks. The GP cement conforms to AS 3972 Type GP. When blended with hydrated lime and washed sharp sand at a 1:1:6 volume ratio, the mix achieves AS 3700 M3 mortar designation (~8 MPa). Bulk supply from Cement Australia batching facilities is available for large projects, in addition to 20 kg and 40 kg trade bags. Note: confirm current product branding with the supplier — Cement Australia products may be marketed under the Holcim name in some states. Hanson Building Products (also now Holcim-owned) may also supply compatible GP cement and hydrated lime products in eastern states where both networks overlap.

Adbri Cement (formerly Adelaide Brighton Cement) GP Cement and Hydrated Lime for site-mixed repointing mortar on Class 2 strata facades. Adbri is Australia's largest independent cement manufacturer, with a particularly strong presence in South Australia, Western Australia, and Northern Territory through its own plants and the Cockburn Cement subsidiary in WA. Adbri GP Cement conforms to AS 3972 Type GP and is available in 20 kg bags nationally through Adbri trade outlets, hardware merchants, and independent masonry suppliers. Adbri Hydrated Lime is produced at the Angaston plant in South Australia and distributed nationally. In states where Boral has a dominant position (Qld, NSW, Vic), Adbri products may be obtained through independent trade merchants. Adbri's national network is supplemented by Cockburn Cement supply in WA for residential and commercial projects. Mix proportions to AS 3700 M3 (1:1:6) or M4 (1:2:9) as confirmed by the project engineer. Trial panel mandatory before colour approval.

Cockburn Cement is the dominant cement manufacturer in Western Australia and a key supplier in South Australia, operating as a subsidiary of the Adbri group. Cockburn GP Cement and Cockburn Hydrated Lime are the standard raw materials for site-mixed repointing mortar on Class 2 strata buildings in Perth, WA and regional Western Australia. Cockburn Cement's products conform to AS 3972 (GP cement) and AS 1672 (hydrated lime) and are distributed through Cockburn trade depots, hardware merchants (Bunnings, Mitre 10), and independent masonry suppliers across the WA market. For Class 2 strata projects in Perth and regional WA, Cockburn is typically the most cost-effective and readily available supplier for GP cement and hydrated lime mortar raw materials. Mix proportions to AS 3700 M3 (1:1:6) or M4 (1:2:9) as confirmed by the project engineer. Trial panel mandatory before colour approval. For eastern states projects, use Boral, Cement Australia, or Adbri instead — Cockburn distribution does not extend east of WA.