Kilsaran KPRO Façade SR 1.5 Silicone Render 25kg

What Is Kilsaran SR 1.5 Silicone Render Used For?

Kilsaran KPRO SR 1.5mm Silicone Render is a premixed, thin-coat wet render that gives a smooth, even textured finish on external walls. It is through-coloured and provides a long-lasting, highly breathable façade finish with very low water absorption.

SR 1.5 is suitable for external wall insulation (EWI) systems, concrete, render carrier board, cement-based renders and gypsum plasters. Its formulation protects against biological contamination such as fungi, mould and algae, and its high dirt resistance keeps the façade looking cleaner for longer with low maintenance.

It can be applied by hand or by machine and is available in a large range of colours.

Key Properties of SR 1.5

• 1.5mm silicone thin-coat render for façades and EWI
• Highly self-cleaning and resistant to dirt pick-up
• Hydrophobic, with very low water absorption (W3)
• High vapour permeability (V1) – a breathable finish
• High elasticity, durable and weather resistant
• Resistant to fungi, algae and mould
• Good colour stability, large colour range
• Hand or machine application
• Supplied in a 25kg bucket made from 62% recycled plastic

Substrate Preparation

The surface must be smooth, dry and clean, free from grease, bitumen, dust and anything else that reduces adhesion:

• Cement and lime-cement plasters: at least 28 days old, moisture ≤ 4%
• Concrete: at least 3 months old, moisture ≤ 4%, primed with KPRO Quartz Primer QP10
• Reinforced basecoats: primed with KPRO Quartz Primer QP10

For a basecoat beneath silicone render, see KPRO OCR One Coat Render.

How to Apply SR 1.5

Stir the whole bucket thoroughly. Apply evenly with a steel float held at an angle, to the thickness of the 1.5mm grain, then texture with a plastic float in uniform round movements. SR 1.5 can also be spray applied, taking care around obstructions such as scaffolding. Work wet on wet, one surface at a time without breaks, using the same product batch. Do not sprinkle the render with water.

Apply at ambient and substrate temperatures between +5°C and +25°C with humidity below 80%. Protect from rain until fully dry; scaffold sheeting is recommended. Winter working additives are available for colder conditions.

Technical Data

Standard	EN 15824:2017, external render based on organic binders
Base	Water dispersion of silicone and acrylic resins with mineral fillers and pigments
Grain size	1.5mm
Consumption	approx. 2.1–2.5 kg/m²
Coverage	approx. 10–12m² per 25kg bucket
Open time	approx. 15 minutes
Density	1.7 kg/dm³
Reaction to fire	A2-s1, d0
Water absorption	W3 (≤0.1 kg/m²h0.5)
Water vapour permeability	V1 (Sd ≤0.14m)
Adhesion	≥0.6 MPa
Thermal conductivity	0.61 W/mK
Application conditions	+5°C to +25°C, humidity below 80%
Shelf life	Up to 12 months stored dry and cool; protect from frost and direct sunlight
Pack size	25kg bucket

Frequently Asked Questions

How much does a 25kg bucket of SR 1.5 cover?
At a consumption of approx. 2.1–2.5 kg/m², one 25kg bucket covers approximately 10–12m².

What primer do I need for SR 1.5?
Kilsaran specifies KPRO Quartz Primer QP10 on concrete and reinforced basecoats before applying SR 1.5.

Is SR 1.5 suitable for external wall insulation?
Yes. SR 1.5 can be used as the finishing coat on external wall insulation systems.

Which is better, SR 1.5 or S-SR 1.5?
Both are 1.5mm thin-coat renders with the same application method and the same EN 15824 water absorption (W3) and vapour permeability (V1) classes. SR 1.5 is a silicone render that Kilsaran describes as highly self-cleaning and highly elastic. S-SR 1.5 is a hybrid silicate-silicone render with good vapour permeability and colour stability. Our team can help you choose for your project.

Available from DP Render Store in Sheffield for click & collect or UK delivery. Trade account holders get trade pricing and expert advice on choosing the right render system.

Learn more about the KPRO Façade range on the official Kilsaran website.