Garden wall render

Question

I have a garden wall around a patio built with thermalite block.  A small portion is a retaining wall but only about 30 cm deep.  What can I use to render the block including below ground surface?  The goal is to finish the block with a smooth surface and paint white.  Location near Peterborough.

Brad · Accepted Answer

Hi Steve you can use sand and cement render but because the garden wall was built with thermalite blocks you will have to sill the blocks with sbr or at times we have nailed galvanized metal lath wire sheets all the best brad

James · Answer

Good evening,

A standard sand and cement render will be the best application

Ian · Answer

Hi
Traditional sand and cement. Sand and cement has the smoothest finish and will not get as dirty and moulding as new rendering styles like silicone

Jason · Answer

You're to scratch coat then top off with sand cement or You're can k.rend it

Nicky · Answer

Would  definitely use a Walter proffer,also add some lime as this will help with movement ,or u could just hire a plasterer off here and keeps us happy 😂👍🏻

Stuart · Answer

If you render below ground, it will just become rotten and will soak up all the moisture from the ground

Scott · Answer

Coat it with k rend that will leave it white and smooth

Sebastian · Answer

First you would need to tank it then sand and cement render or OCR you can also apply render mesh to create some strength.

Sean · Answer

To render your Thermalite block garden wall, including the below-ground portion of the retaining wall (30 cm deep), you will want to select appropriate materials and follow a structured process to ensure a durable, smooth finish suitable for painting. Here’s a guide:

### Steps to Render the Wall

1. **Preparation**:
   - Clean the blocks thoroughly to remove dust, dirt, and any loose particles. Check for damp areas and treat them to prevent moisture issues.

2. **Apply Bonding Agent**: 
   - If using a bonding agent, apply it according to the manufacturer's instructions. This helps the render adhere well to the Thermalite blocks.

3. **Mix the Render**: 
   - Prepare the render mix, ensuring it has a workable, creamy consistency.

4. **First Coat (Scratch Coat)**:
   - Apply a rough scratch coat (around 10-15 mm thick) to the wall using a trowel. Ensure to extend this layer fully, considering below-ground areas.
   - Create horizontal scratches on the surface using a scratch comb or the edge of a trowel. This increases the surface area for the next layer to grip.

5. **Curing**: 
   - Let the scratch coat cure for approximately 24 hours, ensuring it remains moist to prevent rapid drying, which can lead to cracking.

6. **Second Coat (Finish Coat)**: 
   - After curing, apply a smooth finish coat (5-10 mm thick). Use a trowel and float to work the surface until smooth.

7. **Final Curing**: 
   - Allow this coat to cure properly (about 5-7 days), keeping it damp by misting if needed, especially in warm weather.

8. **Painting**: 
   - Once fully cured and dry, you can apply a high-quality exterior paint suitable for masonry. A primer coat can be beneficial for an even finish before applying the final topcoat.

By following these steps and using suitable materials, you can achieve a smooth, white finish on your Thermalite block wall, ensuring both durability and aesthetic appeal.

Garden wall render

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