Kilsaran KPRO Façade OCR One Coat Render 25kg

What Is Kilsaran OCR One Coat Render Used For?

Kilsaran KPRO Façade OCR is a fine-grained, one coat base render for use on both internal and external walls. It is a CS III render that complies with EN 998-1, and can be applied by hand or by spray rendering machine.

OCR can be finished as a napped, sponged or floated surface. It is most often used as a durable basecoat beneath KPRO decorative finishes, and internally as a basecoat for gypsum skim or as an air-tight parge coat.

Because it is factory pre-mixed, OCR removes inaccurate site mixing and gives a consistent, high-quality render with low shrinkage and good crack resistance.

Key Properties of OCR

• One coat base render for internal and external use
• Compressive strength category CS III to EN 998-1
• Hand or machine application
• Napped, sponged or floated finish
• Low shrinkage and good crack resistance
• Class A1 reaction to fire
• CE and UKCA marked
• Supplied in a 25kg premixed bag

Typical Applications

• Single-application basecoat for KPRO decorative mineral finishes
• Basecoat for KPRO decorative organic renders
• Basecoat for KPRO silicone renders such as SR 1.5 and S-SR 1.5, and approved silicone paints
• Robust internal basecoat for gypsum skim finishes
• Internal air-tight parge coat

How Much Does a 25kg Bag of OCR Cover?

8mm thickness	approx. 1.50m² per 25kg bag
10mm thickness	approx. 1.25m² per 25kg bag
15mm thickness	approx. 0.85m² per 25kg bag

Application thicknesses of 8–20mm are possible. When OCR is used externally as a basecoat for thin-coat decorative finishes or silicone paints, a minimum coat thickness of 15mm is required.

Mixing and Application

Mix in a suitable site mixer, continuous mixer or spray render machine using approx. 4.5–5.0 litres of clean water per 25kg bag. When mixing by hand drill or site mixer, allow the material to stand for 1–2 minutes, then remix. Do not add extra water later, as this affects the performance of the render. No scud coat is needed when spray applied. Apply in accordance with EN 13914 and the Kilsaran data sheet.

Technical Data

Standard	EN 998-1, one coat rendering mortar (OC)
Compressive strength	Category CS III
Reaction to fire	Class A1
Water vapour permeability	μ < 20
Thermal conductivity	0.67 W/mK
Application thickness	8–20mm
Application temperature	+5°C to +30°C
Pack size	25kg premixed bag

Frequently Asked Questions

Can OCR be used inside?
Yes. OCR is suitable for internal and external use, including as a basecoat for gypsum skim and as an air-tight parge coat.

Can OCR be machine applied?
Yes. It can be applied by hand or by spray rendering machine. No scud coat is needed when it is spray applied.

Can I put silicone render over OCR?
Yes. OCR is a durable basecoat for KPRO silicone renders. Externally, apply it at a minimum 15mm thickness under thin-coat decorative finishes.

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.