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Patio Pointing Mix: An Instructional Guide

Patio pointing plays a crucial role in both the appearance and longevity of your outdoor spaces. Whether you’re laying a new patio or maintaining an existing one, the right pointing mix will not only keep your patio looking its best but also protect it from weeds and water ingress. This guide offers step-by-step instructions on preparing and applying different types of pointing mixes, ensuring you can choose the right approach for your patio.


1. The Traditional Sand and Cement Pointing Mix

A classic choice for patio pointing, the sand and cement mix is a reliable method for creating a durable, smooth finish between your paving slabs. It is particularly suited to patios made from natural stones like Indian sandstone paving slabs.

Step-by-Step Process:

  1. Prepare the Mix
    The ideal mix for traditional pointing is a 3:1 ratio of building sand to cement. Ensure the mix is dry and consistent in texture before beginning.
  2. Application
    After laying your paving, use a trowel to push the mix into the joints between the slabs. Press firmly to fill all gaps, ensuring no voids remain.
  3. Wet the Surface
    Once the joints are filled, lightly spray the surface with water to activate the cement. Be cautious not to over-saturate, as this can wash the cement out of the joints.
  4. Tidy the Joints
    Once the mortar has begun to set, smooth the joints with a pointing trowel to create a neat, professional finish.

2. Brush-In Jointing Compound

A modern alternative, brush-in jointing compounds offer a pre-mixed solution that simplifies the pointing process. Suitable for novice DIYers, these compounds are easy to apply and ideal for patios with uniform joints.

Steps for Brush-In Jointing Compound:

  1. Prepare the Surface
    Ensure the patio is clean and completely dry. Remove any loose debris from between the joints.
  2. Brush in the Compound
    Open the pre-mixed compound and spread it across the surface of the patio. Use a broom to brush the compound into the joints until all gaps are filled.
  3. Lightly Mist with Water
    Gently mist the surface with water to help the compound settle. Be careful not to drench the patio, as excess water may dilute the jointing mix.
  4. Let It Set
    Allow the compound to set as per the manufacturer’s instructions. This typically takes 24 hours, but ensure the patio remains dry during this period.

3. Two-Part Epoxy Jointing Mortar

For those seeking an exceptionally durable and long-lasting solution, two-part epoxy jointing mortar is ideal. Known for its strength, this method is particularly suitable for driveways or high-traffic patios.

How to Apply Two-Part Epoxy:

  1. Mix the Components
    Follow the manufacturer’s instructions to mix the two parts (resin and hardener) of the epoxy mortar.
  2. Apply to Joints
    Spread the epoxy mix over the paving and use a squeegee to work it into the joints. This method is suitable for larger patios where quick and effective application is essential.
  3. Clean the Surface
    Wipe away any excess mortar from the surface of the slabs before it sets, as epoxy hardens quickly and can be difficult to remove.
  4. Let It Cure
    Leave the patio to cure for 24-48 hours before use.

Choosing the Right Patio Pointing Mix

Pointing MixBest ForProsCons
Sand and Cement MixTraditional stone paving, natural stone like Indian sandstoneDurable, provides a strong bondRequires more skill, can be messy if not applied carefully
Brush-In Jointing CompoundDIY-friendly, patios with uniform jointsEasy to apply, ideal for beginners, fast settingLess durable than traditional mortar, can wash out over time
Two-Part Epoxy Jointing MortarHigh-traffic areas, drivewaysExtremely durable, weather-resistant, long-lastingExpensive, requires precise mixing and careful application

What’s the best mix for patio pointing?

The best mix typically involves 3 parts sand to 1 part cement, creating a strong and durable bond for traditional pointing methods.

Should patio pointing be wet or dry?

Both wet and dry methods have their advantages. Dry brush-in techniques are faster but may be less durable than wet pointing methods, which create a stronger bond.

Can I use a brush-in compound on Indian sandstone?

Yes, brush-in jointing compounds work well on Indian sandstone paving slabs, providing a smooth and clean finish with minimal effort.

Does epoxy jointing mortar need to be sealed?

Epoxy mortar does not usually require sealing, as it is already highly resistant to moisture and weathering.

Is sharp sand or building sand better for pointing?

For pointing, building sand is often preferred due to its finer texture, which creates a smoother finish. Sharp sand can lead to a rougher, less refined look.

Can I use mortar mix for porcelain paving?

Yes, porcelain paving requires a high-quality grout or mortar to ensure a stable and water-resistant finish. Grouting porcelain helps secure the tiles and prevents water ingress.

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