03 Dec 2019

Renders and plasters within the Warmshell insulation systems


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Breathability is key as it means water vapour can escape from a building’s fabric which helps in eliminating problems with condensation and damp, the bugbears of so many synthetic insulation systems.

Warmshell’s breathability is made possible by its natural components, primarily wood fibre and lime renders or plasters. This means they are easy to live with, as they contain no harmful chemicals or adhesives and limit the speed of the spread of fire compared with petro-chemical based materials.

Lime Green’s Warmshell system is so healthy and efficient that it contributes to much lower annual fuel bills. The Warmshell system can be used in commercial as well as domestic environments to keep occupants warm in winter and cool in summer.

The Warmshell systems are manufactured in the UK. The external system, designed for masonry and stone walls, has been tested to ETAG 004 standard and carries a BBA certificate of approval. The wood fibre boards are accredited to FSC standards.

Prepbond WP lime render undercoat

Made from natural hydraulic lime and recycled aggregates, Prepbond WP is a high-quality, lime undercoat render designed for the external Warmshell system.

Prepbond WP lime render undercoat is applied directly onto woodfibre insulation boards to ensure a good surface bond for the finish coat.

This undercoat allows walls to breathe so water vapour can escape from either in or outside the building.

Finish WP external lime render

Finish WP, a specialist, pre-coloured, lime render, is the perfect topcoat for the Warmshell insulation system.

This long-lasting, seamless render has exceptional water resistance, is highly breathable and available in a beautiful range of colours and textures.

Special additives within the product ensure it retains its good look, for example it hampers the development of any algae growth. Glass particles can lend lustre to the render’s finish, whichever the client prefers.

The natural colours in Finish WP are ingrained, meaning it takes the knocks and there’s no paint layer to peel off which makes light work of any maintenance.

Breathable plasters for the internal Warmshell system

Solo Onecoat plaster

Lime Green Solo Onecoat is a one-coat lime plaster for interior use. Developed to have a high-quality finish, Solo Onecoat is suitable for a range of substrates, including woodfibre insulation and plasterboards and flat masonry, to create a smooth surface suitable for decoration.

Unlike standard, lime plasters, Lime Green Solo can be applied directly to walls or boards, ie no base coat is required, making it the perfect, cost-effective, time-saving product for small projects.

Solo is highly permeable to water vapour thereby allowing moisture to escape while also creating a healthier living environment.

Duro Lime Undercoat plaster

Should the masonry substrate be uneven, a skim coat of Duro plaster should be applied to the wall before the woodfibre insulation boards are fixed on. This ensures airtightness and maintains the U-value performance of the Warmshell system.

Cannock Mill co-housing community with an average heating bill is set for £75 pa

Challenge: to build the Cannock Mill co-housing project as a sustainable, affordable community which looks beautiful and performs well.

Seberal private homeowners joined forces to build 23 homes (six apartments, 17 houses) in Colchester, Essex.

Solution: to achieve a healthy build, a timber frame was specified for the walls with Lime Green's external Warmshell providing the insulation over the timber frame studs. This system consists of woodfibre board insulation rendered with Prepbond WP and Finish WP.

Outcome: the pre-coloured Finish WP render has given the homes a beautiful, seamless finish.

Employing Lime Green's Warmshell insulation system and using their external renders has resulted in extremely low - Passive House compliant - U-values for each of the buildings, making the homes more affordable.

The average, annual, fuel bill for the properties is estimated to cost the equivalent of a cup of coffee per fortnight at £75.


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