WHY BUILD WITH HEMP     -                               Return to OldBuilders Home page

Properties of Hemp-Lime

Hemp-lime roof mix contains 155kg CO2/m3 , Hemp-lime wall mix contains 85kg CO2/m3

Walls of Houses

A small semi detached house of 48 m2 GFA with 300 mm thick walls, contains 33 m3 of Hemp-lime

Thermal Tests

Testing carried out by the BRE on the Haverhill houses, comparing actual performance vs. theoretical performance might suggest that the thermal performance of hemp-lime is up to 40% greater than its u-value would indicate. This is due to the effect of thermal mass and humidity control. This would suggest that a 400mm thick wall would give you the thermal equivalent of 0.13 W/m2.K.  In order for you to make an important decision like this you should read the BRE reports and other studies to understand the effects of thermal mass. http://projects.bre.co.uk/hemphomes/

Acoustic Performance
Testing carried out by the BRE on the Haverhill houses see http://projects.bre.co.uk/hemphomes/
 showed that hemp-lime construction met the acoustic requirements of the building regulations. Further ongoing research shows that it has the ability to absorb up to 90% of air-born sound. This research is continuing in order to maximise the potential of hemp-lime to be used in sound-proofing applications.


Thermal images

Compares HEMP built with MASONRY built, clearly shows less heat loss from the hemp building.

 This top picture is the Hemp house, blue is cold outside wall = less heat loss


 Bottom Picture is Masonry house, red is warm outside wall = MORE heat loss


SOME HEMP BUILDINGS BUILT BY OLDBUILDERS These photos show the process of hemp building, note the mixing, barrows, shuttering and hand tamping used by us until recently here in Ireland, we now also use the machine mix and blown method like in pictures above used in France.

Hemp building area on website for more information 




Hemp building area on website for more information 
The end.

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