Should 3:1 mix to be waterproof for the new DPC bricks?

Question

Should 3:1 mix to be waterproof for the new DPC bricks? Should I ask them to redo the work?

Neil · Answer

If they have done the brickwork in 3 n 1 mix it will be fine

Pete · Answer

For a new DPC (Damp Proof Course), a 3:1 mix is a good starting point, but it's not necessarily waterproof on its own. The mix ratio and additives can impact its water resistance.

A 3:1 mix typically refers to a mortar mix of 3 parts sand to 1 part cement. To enhance water resistance, consider adding a plasticizer or waterproofing admixture to the mix ¹.

Some experts recommend a mix of 3:1 or 3.5:1 with plasticizer for below DPC applications. Others suggest a stronger mix, like 2:1 or 1:1, for added protection. However, it's essential to balance strength with flexibility to avoid damaging the bricks or surrounding structure ².

To achieve optimal water resistance, consider the following:
- *Add a waterproofing agent*: Products like Dryseal waterproofer or MicroShield Ultra can enhance the mix's water-repellent properties.
- *Use a breathable mix*: Ensure the mix allows moisture to escape, reducing the risk of trapped dampness.
- *Apply a sealant*: Consider applying a waterproofing cream or sealant to the bricks and mortar for added protection.

Consult with a professional or follow local building regulations for specific guidance on DPC installation and waterproofing ³ ⁴.

Dave · Answer

The gauge is standard and no need to waterproof anything as the dpm stops any rising moisture .

Should 3:1 mix to be waterproof for the new DPC bricks?

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