hi m8 sbr is a bonding coat used on dodgy backgrounds
Improves adhesion, bonding and flexibility.
• Designed for use in damp and wet conditions.
• Improves workability, strength and abrasion resistance.
• Reduces shrinkage and cracking in render mixes.
• Allows reduction in water content.
• Improves chemical and water resistance
All surfaces should be structurally sound, free from laitence, oil, grease, paint
and surface water. This can be achieved by grit blasting, mechanical scabbling
etc. to provide a clean and fresh exposed surface.
Before the application of a bonding slurry coat, surfaces of high suction
should be thoroughly dampened down.
An SBR bonding coat slurry should always be used on surfaces with
low suction, when applying sand-cement render mixes and also before the
application of a waterproofing system – see specification overleaf
2. Renders
To produce a dense, impermeable render use 50kg OPC, 125kg clean,
sharp sand (BS:1199),with 15 litres of SBR additive and mix with water as
required. Apply render in two well scratched 6mm coats to give 12mm
thickness overall. This will give 8 square metres of rendered wall. Allow 4-6
hours between each coat.
3. Damp Proofing
Where dampness is present or expected, either below or above ground, then
three coats of bonding slurry should be applied before application of any
further render or waterproofing system. Each slurry coat should be allowed to
become ‘touch dry’ before the next coat is applied.
4. Flooring
To produce high quality, hard wearing floor finishes use 50kg OPC, 75kg
sharp flooring grit, 75kg granite chips (3mm) with 10 litres of SBR additive
and mix with water as required. This will give 8 square metres of screed laid
at a 12mm thickness.
Prepare floor base well and apply bonding slurry. Mix materials semi-dry and
lay onto the slurry up to a thickness of 25mm. For additional thickness reduce
SBR to 5 litres and add extra water to produce a semi-dry mix.