Cornerstone Promix Coarse Basecoat Render & Plaster is a dry, ready-mixed natural hydraulic lime (NHL) formula optimised for high-performance building applications. Engineered using 100% pure natural hydraulic lime, natural sands, and conservation-appropriate additives, it features a contemporary white or off-white aesthetic. This breathable product functions smoothly across internal and external layouts, ideal for heritage conservation, renovations, and sustainable modern builds
Its formulation is highly elastic, mitigating the risk of slumping while maximising adhesion to structural substrates. Its long open time allows installers to apply, level, and finish coats with minimal stress. It is highly versatile, acting as a high-quality scratch coat, dubbing out coat, or a textured finish topcoat.
Key Features
- Highly Vapour Permeable: Promotes superior moisture management within solid wall configurations.
- Low Cracking Risks: Minimises shrinkage cracking while supporting an even curing cycle.
- Flexible Specifications: Comes standard with Saint-Astier® NHL2 or NHL3.5 binders.
- Enhanced Workability: Formulated with 4mm down washed silica sand to offer a balanced coarse texture.
- Top Safety Profile: Carries an elite A1 Fire Rating for structural safety.
- This is a dry ready mixed render and plaster designed as a coarse basecoat or float coat within an appropriate render system
- Promix lime basecoat plaster is manufactured using 100% pure natural hydraulic lime and carefully selected natural sands.
- Lime plaster is vapour permeable to support moisture management.
- Enhanced plasticity helps reduce slump and improve adhesion to substrates.
- It promotes even curing for an improved bond
| Product Type | Basecoat Lime Render & Plaster |
| Product code | Promix |
| Brand | Cornorstone Mortars |
| Yield | A 25kg bag yields approx. 15 litres |
| Materials | Natural Hydraulic Lime, Natural Sands, Additives |
| Coverage | One 25Kg bag covers approx. 1.5m2 at 10mm thickness |
| Fire Rating | A1 |
| Colour | Buff |
| Coat | Basecoat |
| Use | Internal, External |
| Order Value | Delivery Charges (Excluding VAT) |
|---|---|
| 1-10 | £30 across the Mainland UK |
| 11-20 | £50 across the Mainland UK |
| Pallet Charges apply Thereafter | |
Returns/Refunds And Cancellations:
- You can cancel your order and get a full refund anytime before we confirm your order via email.
- Orders cancelled after the order confirmation is sent may attract a restocking fee.
- If you want to return insulation that was ordered in excess or not of use anymore, you can return them within 14 days from the date of receipt, provided they are unused and in a resalable condition. Please contact us via email and we will assist you accordingly.
- If the product is damaged on receipt, email us immediately
For more information on returns and deliveries, please refer to our delivery information page.
