Application - How do I mix the plaster? What is 'knocking up'?

How do I mix the plaster? What is 'knocking up'?

• Either type of mixer is suitable (pan / cement mixer)
• It’s a good idea to have a sharp knife with you so you can open the bag
• Opening a bag badly can cause more work and waste
• Empty bag into mixer and start.
• If there is any need to add water do this tentatively. The mix is thixotropic, so it will wet up as it mixes
• Leave to mix
• Add more water if necessary
• Mixing time is around 15-20 minutes
• Be prepared, plaster can be knocking up while you are doing other things on site.

The application of lime plaster is more involved than using conventional plaster.It is highly recommended to use a plasterer experienced in the use of lime plasters or at the very least you should get some practical experience e.g. on a course, as it is not possible to cover every point in detail here.

Disclaimer - no responsibility can be accepted for any errors or omissions or any loss or damage as a result of using the information provided in these guidelines.