Sovereign Rendermix 5Ltrs
Sovereign Rendermix is a waterproofing additive for incorporation into the backing render coat after the insertion of a DPC injection. When used in sand cement renders it also provides workability so that further admixtures are not required.
Its use, as described in the Sovereign Re-rendering Specification, ensures the hygroscopic salts are prevented from moving to the surface plaster and exhibiting secondary dampness. Sovereign Rendermix is not a vapour barrier and so will allow the walls to dry out and breathe naturally.
Rendermix Benefits and Features
- Is used in conjunction with sovereign DPC injection systems
- Stops the passage of hygroscopic salts
1ST RENDER COAT
To be 8 – 12 mm thick maximum, waterproofed by the addition of Sovereign Rendermix to the gauging water at the ratio of 40:1. The first render coat must be of the following design: • 3 parts washed sharp sand • 1 part Ordinary Portland Cement Use the minimum of water to provide workability to ensure that a dense coat is achieved. As the render coat begins its initial set, scratch for a mechanical key. Leave a 25 mm channel between rendering and f loor, but do not bridge the level of the DPC unless the wall has been tanked.
2ND COAT To be 6 – 10 mm thick or not less than 16 mm overall thickness in coats 1 and 2. The second coat of render must be of the following design: • 4 parts washed sharp sand • 1 part Ordinary Portland Cement Apply on to the first coat and again scratch up as the render begins to set.
FINISHING To be 1 – 3 mm thick, porous and not over-trowelled. For best results, use Sovereign Renderlite Finish. If an alternative rendering system is desired, please refer to our Technical Department. Angle beads must not be fixed with gypsum-based material.
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