Batichanvre®
Technical data sheet
Dry density (average) 700g.l
Packing : 25 kg. bags. Pallets of 50 bags (1.25T).
Do not work in temperatures below 5oC or above 30oC.
Protect fresh mortars from frost, rain or strong direct sun.
Whiteness index: 0.46
Shelf life: 12 month if kept dry.
Storage: in dry store. Reseal open bags a.s.a.p
Suitable for
Walls, counter-walls and half-timbering. Flooring and screeds. Insulating concrete for roofing. To be used with a « building » certified hemp. Before starting, always try on a small test area.
Mixing and performance
Hemp renders are applied in coats of 2-3 cm. maximum. Wait 30-90 minutes between coats. If no finishing coat with other materials is envisaged, wait 3-4 days before applying the last coat (2cm.). Consider using EcoMortar® Finish WP as a finishing coat, it is a very low capillarity natural lime mortar that will impede water ingress in the main hemp render. For painting with lime, wait for the work to dry (60-90 days) and use Uniprotect in external paint work. Don’t forget to loosen hemp if compacted in bundles.
| Mixing in paddle mixers | Mixing in drum mixers |
|---|---|
|
Introduce the hemp and the sand. Whilst turning, spray with water mist until the hemp dampens (colour change). Introduce the Batichanvre and continue to spray until an homogeneous mix is obtained. Total mixing time is about 5 – 10 minutes. |
Introduce about 30 litres of water and the Batichanvre. Mix for 3-5 minutes to obtain a milky paste with no lumps. Add the loose hemp and mix for about 5 minutes to obtain the required mix adding the rest of the water. The completed mix should be rather dry and lean. Total mixing time is about 8-10 minutes |
1) For hemp concrete and shuttered hemp walls
| Mortar composition and dosage Batichanvre+Hemp+Water | Volumetric Mass Kg/m3 28/60/90 days | Compressive strength MPa 28/60/90 days | Young Elasticity Moduli MPa 28/60/90 days | 90 days Thermal Conductivity (λ) W/m.K | Mortar consumption Kg x m2 x cm of thickness |
|---|---|---|---|---|---|
|
25kg + 100 litres
+ 30-35 litres |
452 / 430 / 421 |
0.8 / 0.8 / 0.7 |
58 / 62.2 / 60.3 |
0.09 |
Batichanvre =2.6kg
Hemp= 10.5 litres |
2) For hemp renders
| Mortar composition and dosage Batichanvre+Hemp-+Water | Volumetric Mass Kg/m3 28 days | Compressive strength MPa 28/60/90 days | Young Elasticity Moduli MPa 28/60/90 days | 90 days Thermal Conductivity (λ) W/m.K | Mortar consumption Kg x m2 x cm of thickness |
|---|---|---|---|---|---|
|
50kg + 100 litres+ 53 litres |
900 |
0.81 /2.2/2.2 |
X / 228 / 174 |
0.14 |
Batichanvre = 5.6kg
Hemp = 11 litres |
French Building Federation - Hemp construction rules minimum requirements
| Minimum 28 days requirements | Volumetric mass Kg/m3 | Compressive Strength MPa | Young Elasticity moduli MPa |
|---|---|---|---|
|
S= ground
M = wall
E = render |
S = 500
M = 420
R = 800 |
S = 0.3
M = 0.2
E = 0.3 |
S = 15
M = 15
E = 20 |
For further information, see Hemp construction & Batichanvre Health and Safety