Finish WP External Lime Render

Grab the image to zoom

A specialist lime finish coat render for the Warmshell insulation system. It has exceptional water resistance while remaining highly breathable. Available in a range of colours and textures.

Special additives in this external lime render reduce the risk of surface cracking and the development of algae growth. Finish WP also offers the very best protection against rain and other elements. This creates a long-lasting and stable finish with built-in colour that greatly reduces the need for maintenance and repair.

So, use Finish WP lime render and not only will you save on the cost and time of painting but then won't have to worry about paintwork flaking or being knocked and revealing another colour beneath.



22 kg sacks, 48 per pallet.


Approx 1.6kg of powder is required per mm of thickness over 1m².

A 22kg bag will cover approximately 2.75 m² at 5mm thick. This does not include any allowance for wastage.

Surface Preparation

Apply to a flat, previously keyed basecoat of Prepbond WP. The background should be flat (typically ±3mm per meter). Dampen the surface with a gentle mist spray of water before starting.


Finish WP should be mixed either with a suitable machine with 4 to 5 litres of clean water per bag. Typical mixing time is between 5-10 minutes.

Application Guidelines

Temperatures: above 5°C and below 30°C.


The background must be straight flat and dampened. Never attempt to build out and level using Finish WP. Different textures may be achieved using the following methods;

  • Scraped finish
  • Sponge Finish
  • Wood float finish

Different methods of finishing will affect the colour and texture of the product. Make sample panels before starting the main work.


Prevent from drying out too rapidly.

Lightly spray each coat with water if it is hot or the product is drying too quickly.

Protect from adverse conditions such as frost, rain etc. until fully set.

Please note that colours on screen may vary from actual finishes.

Use this colour chart to narrow your choice of finishes then get in contact with us for your your colour samples
















Seaside Blue



Please note that colours on screen may vary from actual finishes.

Use this colour chart to narrow your choice of finishes then get in contact with us for your your colour samples

Project: Tyland Barn, Near Maidstone, Kent

When Kent Wildlife Trust needed new offices, it was only appropriate that this organisation, committed to protecting and preserving the natural environment, should chose to refurbish historic C17th Tyland Barn. No simple task, since the listed building was in a state of almost total dereliction.

The Requirement

To resurrect the old building meant finding an approach that would make it not only structurally sound once again, and effective as modern day office space, but which would also meet the stringent requirements of local conservation officers, intent on preserving its local character.

The Problem

  • Besides dealing with structural issues, any renovation had to take into account the multiple construction methods used in the original building - brick for the ground floor walls, with timber frame and lathe and plaster render above.
  • The works had to be carried out sympathetically, to remain in keeping with other traditional architecture in the local area.
  • To keep the building's historic integrity, no synthetic materials or systems could be used in the renovation.
  • Given that existing, traditional materials would still be part of the building's structure, these had to be allowed to breathe, or trapped moisture could severely damage their integrity.

The Solution

Lime Green's Warmshell insulation system is able to bring an old building constructed of traditional materials up to modern energy efficiency standards, and to do so sustainably.

For the Warmshell system at Tyland Barn, wood-fibre insulation boards were fixed directly to the brickwork on the ground floor and to the timber studs on the storey above, using specialist fixings. To these were applied first a base coat of lime render (Prepbond WP) with an embedded glass fibre mesh, followed by a final top coat (Finish WP).

Image showing Tyland Barn’s exterior wall insulation, Kent. Insulated using Lime Green’s Warmshell Insulation System.

The Benefits

  • The Warmshell system ensures minimal air leakage, creating a comfortable working environment that is also energy efficient, even when starting with an old building like Tyland Barn.
  • The first coat of plaster is specifically designed to adhere to the wood-fibre boards, while the glass fibre mesh within it not only offers impact resistance, but also binds individual boards together into one tight unit.
  • The top coat of Finish WP contains a powerful water repellent that enables water vapour to escape from beneath, but prevents water droplets from entering other than at the most superficial level from the outside. This makes the surface coat almost as waterproof as concrete, but much more breathable.
  • Lime can accommodate a great deal of movement, an important consideration when dealing with a building made from natural materials.

Lime Green's Warmshell insulation system is not only undergoing BBA approval testing currently, but also very robust European technical approval testing, which effectively exposes the system to 25 years of weather conditions in just 28 days, so severe are the testing protocols used.