This is a short post showing videos and photos of the Diathonite being applied. It was a busy three days. BorderLime worked really hard and did a superb job. We worked alongside them, with Tom on the mixing machine. You can see from the videos the speed at which the product goes on to the walls, and the mess it creates. It really was worth masking stuff up thoroughly, although we still spent several weeks vacuuming fragments of cork and lime dust.

The finished result was transformational. We’re yet to experience a winter with it, but I’ll post an update when we have some more feedback on its performance.

Videos of Diathonite Application

Diathonite Mixing Machine in action

This video shows the diathonite mixing machine in action. A bag of Diathonite Thermactive is placed onto the top of the hopper. The serrated edge cuts the bag open. The top and bottom of the bag are lifted up to pour the dry mixture out. It filters down through the grille into the hopper where it is dosed with the correct amount of water, and mixed up. It is then pumped into the building through the hose and sprayed onto the wall.

Spatter coat application onto smooth substrate

This video shows the first “spatter” coat of Diathonite Evolution being applied to a bare brick internal wall. The hose brings the Diathonite into the building from the machine which is mixing it up outside.
The spatter coat serves as a “key” for the proper base coat to adhere to – this is important if the substrate is not very grippy, as was the case with these smooth bricks. It was left to dry for a short while prior to the base coat being sprayed on at a thickness of up to 20mm.

Spraying the second coat onto the stone walls

These two videos show the application of the second coat of Diathonite Thermactive, the day after the base coat was applied in the same way, and roughly trowelled off. The Diathonite goes on in a continuously sprayed “worm”, which is then trowelled by hand to make a uniform finish. This coat will be left to dry for a couple of weeks prior to hand finishing with a lime plaster.

Trowelling off the second coat

This video shows the Diathonite being smoothed off after the second coat has been sprayed on. It is trowelled by hand to achieve a finish which is ready for a final coat of lime plaster.

Photos of Diathonite Application

To read about how we decided to use Diathonite and how we prepared for the installation, read the other posts.

2 comments to “Diathonite Insulating Lime Plaster – Part 3, Installation”

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  1. Karl Roscoe - 30th August, 2019 Reply

    Great stuff, thank you once again for sharing.

    In the picture ‘Finished top coat and the join into stone wall…’, regarding spray the ‘left’ wall, is the ‘left’ wall partly external or completely internal? I’ve been thinking about spray diathonite three inches into a room on the internal wall that meets an external wall? Your left wall looks like at least a couple of feet and so interested to know the reasoning there.

    Where did you apply the Deumix? In for the first foot up a wall where rising damp was an issue, then continue with Thermactive or Evolution?



  2. LoisLogsLune - 17th September, 2019 Reply

    Hi Karl,
    Thanks for your question. The wall in that picture is in fact the external gable wall. In a yet-to-be-published post, I will explain the detailing of the gable, but in summary the gable had a new stone wall built on the outside of it, and a fully filled cavity using Dritherm. So whilst this wall is now insulated, there is the thermal bridge between the “external” insulation in the gable, and the internal diathonite (see the detail in the sketch
    We returned the diathonite approximately 1m along the gable wall. I suspect that 3 inches won’t really provide much benefit, but our 1m corresponds to the purlin above, so was a natural place to take it to.

    The Deumix was applied to two areas for the first 1m height on the external back wall of the property which is actually below ground level outside (albeit with external insulation, tanking and suitable drainage). Whilst these were not specifically “problem areas”, both were in corners under the stairs, and so had limited air flow. The carpets which were there were mouldy and smelled bad, and there was a general sense of dampness. Whether this was rising damp or just stagnant air in a cold corner is difficult to say, but we took the opportunity to apply the Deumix whilst doing the rest of the work.

    When we returned from a recent trip away, for the first time since we’ve owned this place, it didn’t smell musty when we returned, so I reckon the Diathonite is offering a benefit already.

    Hope this answers your questions.
    Best wishes,

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