What is the best cement mix for pointing slabs?

The best cement mix for pointing slabs is typically a 4 parts sharp sand to 1 part cement mixture.

Here's a breakdown of why this ratio works well and how to prepare it:

Why 4:1 Sharp Sand to Cement?

Workability: The higher proportion of sand makes the mix more workable and easier to push into the joints between slabs.
Reduced Shrinkage: Too much cement can lead to cracking as the pointing mix dries and shrinks. The sand helps to minimize shrinkage.
Flexibility: A slightly more flexible mix is desirable for coping with slight movements in the patio or paving over time.

Gather your materials: You'll need sharp sand, cement, a mixing container (wheelbarrow or large tray), a shovel or trowel, and water.
Mix the dry ingredients: In your mixing container, combine 4 parts sharp sand with 1 part cement. Mix thoroughly until the color is uniform. This ensures even distribution of the cement.
Add water gradually: Slowly add water to the dry mix while continuing to mix. The goal is to achieve a consistency where the mix balls up in your hand when squeezed but isn't overly wet or soupy. Add water a little at a time to avoid making it too wet.
Check the consistency: The ideal consistency is often described as "plastic" or "moldable." It should hold its shape but be easily pushed into the joints.
Use immediately: It's best to use the pointing mix soon after preparing it. The mix will start to harden over time.

Sharp Sand is Key: Do not use builders sand or play sand. Sharp sand has coarser particles, which is necessary for a strong, durable pointing mix.
Weather: Avoid pointing in very hot or freezing conditions. Extreme temperatures can affect the curing process and the strength of the pointing.
Joint Width: For wider joints, you might consider adding a small amount of lime to the mix for improved workability and flexibility. However, for most standard slab pointing, the 4:1 ratio is sufficient.
Cleanliness: Make sure the joints are clean and free of debris before applying the pointing mix. This will help the mix adhere properly.