Lime Green's Hempcrete Binder is a tried and tested product manufactured in the UK using British lime which allows for carbon negative building.
It has been specially developed for hemp construction methods. The tried and tested formula made in the UK with British lime for better-than-zero carbon building.
This binder contains 20% recycled content and is designed for hand placed hempcrete or hemp render. A version of the binder that is suitable for a sprayable hempcrete is also available, please contact us for further information and a quote.
Mixing & Consumption Rates
For Cast walls, Mix 2 x 20kg of of binder with 1 bale of Hemp Shiv. Add approximately 30-40 Litres of water to achieve a semi dry "tuna mayonnaise" consistency.
For 1m3 of hempcrete you will need approximately 5 to 5.5 Bales of Hemp Shiv mixed with 10 bags of the Hemp Binder
Hempcrete can be mixed by hand, in a forced action pan mixer or a drum mixer.
- Forced action pan mixer: Add the hemp first, start the mixer then add the binder. Once all the binder has been added and coated the hemp, pour in the water and mix until consistent.
- Drum mixer: mixers with an adjustable angle wheel are recommended.
Add the water first, then the binder and allow to mix, before adding the hemp. Mix for the shortest time possible to achieve a consistent mix. To avoid the semi dry mix sticking to the back of the drum lower the drum angle down as soon as all the ingredients are in. For mixers without an adjustable angle wheel, you will need to manually tip the mixer forward and hold it in position.
Finishing
Walls should be prepared to a good quality of finish with a light texture.
Internally Use a nail float to straighten the hempcrete if necessary and coat with approximately 10mm of Lime Green Solo. Reinforcement mesh is not always required but can be useful around lintels and to improve impact resistance.
Externally Use a nail float to straighten the wall and remove high spots as necessary. Render in 2 coats:
- Lime Green Duro, applied 10mm thick with 910 reinforcement mesh in the middle with a 10% overlap. Straighten and float to a lightly texture surface.
Leave approx. 10 days to cure - For a traditional look finish with a coloured render such as the Lime Green Natural finish or for a more modern crisp look finish with a breathable masonry Paint.
In areas of Very Severe wind driven rain, a drained ventilated cavity should be formed instead of direct render application.
PLEASE NOTE: Information is for guidance only, follow relevant codes and regulations. Detailed information on building with hemp is available in specialist books and training courses.
Technical Data
- Compressive Strength: 0.3N/mm2 +
- Density: 350 to 450 kg/ m3 depending on compaction
- Thermal Conductivity: 0.07 to 0.12W/mK depending on compaction (0% moisture)
- Composition: Lime Green Hemp Binder is blended in the UK using CL90 air lime, secondary waste mortar, chalk and Cem I 52.5.
Downloads
Technical Data Sheet (opens in new tab)
Safety Data Sheet (opens in new tab)
