Back-Blocking Cement

Gyprock Back-Blocking Cement is a specially formulated plaster based cement used for reinforcing plasterboard joints where there is no framing support.

Typical Applications

Gyprock Back-Blocking Cement is used to adhere back-blocks to strengthen joints where there is no framing to fix to. It is typically used in butt and recessed joints in ceilings and walls.

Category: CSR, Adhesives & Sealants
Store availability: Cabramatta, Katoomba
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Gyprock Back-Blocking Cement is a simple and convenient way to adhere supporting back-block strips behind joints in plasterboard sheets where there is no framing to fix to. Back-blocks are plasterboard off-cuts at least 200mm wide and long enough to fit between the framing members.

It is specially formulated to offer excellent adhesion properties and to minimise the risk of joint cracking or distortion.

Gyprock Back-Blocking Cement supplied as a dry powder and is easy to mix and apply by hand using a notched trowel. It has a 2 hour working life once mixed.

Product Options

Gyprock Back-Blocking Cement is available in 20kg bags with a shelf life of 1 year from date of manufacture.

For product availability and to place an order, contact your nearest supplier.

Physical & Chemical Properties

Specific gravity (H20=1) 2.3 -2.4
VOC content (as specified by GBCA) < 10g/L as VOC content per material

Product Manufacture

Gyprock Back-Blocking Cement is manufactured by CSR Gyprock in Australia to stringent product specifications.

Product Handling

Transportation and manual handling: Refer to the Gypsum Board Manufacturers of Australia (GBMA) website for recommended OH&S practices.

Storage: Store bags of compound in a dry environment, protected from the weather and out of direct sunlight. Tear bag open from top corner to dispense compound. Unused product which has been mixed with water should be discarded. Unused product in powder format should be stored in original bag: roll the top of the bag to loosely seal, and store in an airtight container.

Health and Safety

Safety Data Sheets are important documents in the construction industry and assist in the continuing focus on occupational health and safety on and off sites.

Installing to Standards

AS/NZS2589: Gypsum linings – Application and Finishing outlines the procedures for jointing and finishing of Gyprock plasterboard in conjunction with additional details contained in Gyprock Technical Literature.


Gyprock makes available resources that provide comprehensive selection, design, installation and maintenance guidance.

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