Diathonite job in north east

Question

Has anyone in the county durham/weardale area ever applied diathonite before? 

Thanks

Martin · Answer

I know sombody from there that says they have if this helps kind regards

Tony · Answer

Step-by-Step: How to Apply Diathonite Thermal Plaster

1. Surface Preparation

•  Clean the substrate: Remove dust, loose material, paint, or efflorescence. Use a wire brush or pressure washer if needed.
•  Check moisture levels: Substrate should be dry or only slightly damp—not saturated.
•  Apply primer: Use D20 Primer or equivalent to improve adhesion and regulate absorption. Let it dry fully.

2. Mixing Diathonite

•  Use a mechanical mixer (e.g. paddle or forced-action mixer).
•  Add Diathonite powder to clean water gradually.
•  Mix until you get a homogeneous, lump-free paste—usually 5–6 minutes.
•  Let it rest for 5 minutes, then remix briefly before application.

3. Application

•  Apply using a spray machine (recommended for large areas) or manually with a trowel.
•  First coat: Apply a base layer of 1.5–2 cm thickness.
•  Wait 24–48 hours (depending on humidity) before applying the next coat.
•  Build up to the desired thickness—typically 3–5 cm for thermal insulation.

4. Finishing

•  Once the final coat is semi-dry, float the surface with a plastic or sponge float to achieve a smooth or textured finish.
•  For decorative finishes, apply a lime-based skim coat or breathable paint like silicate or mineral paint.

5. Curing

•  Allow natural drying—avoid forced drying with heaters.
•  Protect from rain, frost, and direct sun during curing (use mesh or tarpaulin if needed).

Nick · Answer

Hi hope your well. I am based in Edinburgh but we have just finished our 2nd diathonite job

Dafydd · Answer

Yes it's nice enough to use. Not the cheapest way of doing the work but if its required.

Diathonite job in north east

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