Heritage Lime Skim 66
Heritage Lime Skim 66 is a premium ready-mixed lime putty finishing plaster designed to provide a smooth, breathable final coat within traditional lime plaster systems. Manufactured using matured non-hydraulic lime putty, carefully selected natural sands, and chalk dust, it delivers a refined off-white finish while maintaining the vapour permeability and flexibility required for traditional and solid-wall buildings.
Made using Roundtower's own lime putty matured for a minimum of four months, Heritage Lime Skim 66 offers exceptional workability and is particularly suited to conservation, restoration, and eco-build projects where breathability and compatibility with traditional materials are essential. Unlike gypsum finishes, it remains highly vapour open, helping walls regulate moisture naturally.
Technical Data
| Property | Value |
|---|---|
| Product Type | Lime Putty Smooth Finishing Plaster |
| Binder | Matured Non-Hydraulic Lime Putty |
| Colour | Natural Off-White |
| Packaging | 20kg Tub / 25kg Bag |
| Yield | Approx. 13 Litres Wet Plaster |
| Coverage | Approx. 4m² per 20kg tub at 2mm |
| Coverage | Approx. 5m² per 25kg bag at 2mm |
| Recommended Thickness | Up to 3mm |
| Application | Internal Finish Coat |
| Vapour Behaviour | Highly Breathable & Vapour Open |
Source: Roundtower Lime Product Information.
Key Benefits
Smooth Traditional Finish
A superfine lime putty skim designed to achieve a refined internal finish while retaining the character and breathability of traditional lime plaster systems.
Highly Breathable
Allows moisture vapour to move freely through the wall structure, helping regulate humidity and reducing the risk of trapped moisture within solid-wall buildings.
Made with Matured Lime Putty
Produced using lime putty matured for a minimum of four months, improving workability, flexibility and finish quality.
Flexible & Compatible
The non-hydraulic lime binder remains softer and more accommodating of movement than gypsum or cement-based finishes, making it suitable for traditional masonry and conservation projects.
No Synthetic Additives
Contains no pigments or synthetic additives that may contribute to long-term discolouration or reduce vapour permeability.
Multiple Finish Options
Can be finished with:
- Float finish
- Sponge finish
- Matte polished finish
depending on the desired appearance and specification.
Typical Applications
- Internal lime plaster finishing
- Heritage restoration
- Conservation projects
- Traditional stone buildings
- Solid-wall construction
- Lime render systems
- Eco-build projects
- Breathable renovation work
Why Use Heritage Lime Skim 66?
Traditional masonry buildings rely on vapour permeability to manage moisture naturally. Modern gypsum finishes can restrict this moisture movement and are often less compatible with older building fabrics.
Heritage Lime Skim 66 provides:
- high vapour permeability,
- excellent workability,
- flexibility,
- and a traditional aesthetic finish,
making it particularly suitable for historic buildings, breathable wall systems, and conservation-led projects.
Installation Overview
1. Surface Preparation
Apply only to suitable lime-based background coats that are:
- stable,
- clean,
- dust free,
- and properly cured.
2. Application
Apply as a finish coat over a compatible lime undercoat render.
Recommended maximum thickness:
- 3mm.
3. Finishing
Depending on the desired appearance, the plaster can be:
- floated,
- sponged,
- or polished to a matte finish.
4. Drying & Curing
Allow the plaster to dry gradually. As with all lime putty products, drying conditions and background suction should be carefully controlled to achieve the best finish.
5. Storage
Store in sealed containers and protect from frost and contamination before use.
