If you have a patio that’s looking a bit worse for wear, it might be time to repoint it. Repointing involves removing the old, damaged mortar from between the patio stones, and replacing it with new mortar. This not only improves the look of your patio, but also helps to prevent water damage and weed growth.
To repoint your patio, you’ll need some basic tools and materials, including a chisel, a hammer, a pointing trowel, and some mortar mix. You’ll also need to prepare the patio by cleaning it thoroughly and removing any loose or damaged mortar. Once you’ve done this, you can begin the repointing process, working one section at a time to ensure a neat and even finish.
Assessing the Patio Condition
Before starting the repointing process, it’s crucial to assess the condition of your patio. This will help you determine the extent of the work required and the materials needed. Here are the two main steps to assess your patio condition.
Identifying Areas That Need Repointing
The first step is to identify the areas of your patio that require repointing. Look for cracks, gaps, or missing mortar between the bricks or stones. These areas are prone to water penetration, which can cause further damage to your patio. Use a screwdriver or a pointed tool to probe the mortar joints gently. If the mortar crumbles or falls out easily, it’s a sign that it needs to be replaced.
Evaluating the Existing Mortar
Once you’ve identified the areas that need repointing, you need to evaluate the existing mortar. Check the colour, texture, and strength of the mortar. If the mortar is soft, powdery, or crumbly, it’s a sign that it’s deteriorating and needs to be replaced. If the mortar is hard and intact, you can reuse it by cleaning it and removing any debris.
It’s also essential to check the type of mortar used in your patio. If you’re unsure, take a small sample of the mortar to a building supplier or a masonry expert for analysis. Matching the existing mortar’s composition is crucial to ensure that the new mortar blends in seamlessly with the old one.
By following these steps, you can assess your patio’s condition and determine the right approach to repointing it.
Repointing the Patio
Removing Old Mortar
Before you can repoint your patio, you need to remove the old, damaged mortar. This can be done using a chisel and hammer or an angle grinder with a diamond blade. Be sure to wear protective goggles and a dust mask to avoid injury and inhaling dust.
Start by chiselling out the old mortar to a depth of at least 10mm. Use a wire brush to remove any loose debris. If using an angle grinder, be careful not to cut into the patio slabs.
Mixing the Repointing Mortar
To mix the repointing mortar, you will need sand, cement, and water. The ratio of sand to cement will depend on the type of patio slabs you have. A general rule of thumb is to use four parts sand to one part cement.
Mix the sand and cement together in a wheelbarrow or large bucket. Gradually add water and mix until you have a smooth, workable consistency. Be careful not to make the mortar too wet, as this can weaken the bond.
Applying the New Mortar
Using a pointing trowel, apply the new mortar to the joints between the patio slabs. Work in small sections, pressing the mortar firmly into the joints and smoothing it out with the trowel. Be sure to fill the joints completely, leaving no gaps.
Once you have filled a section, use a pointing tool to smooth out the mortar and create a neat finish. Repeat this process until you have repointed the entire patio.
Finishing Touches
After you have finished repointing the patio, allow the mortar to dry for at least 24 hours. Once it has dried, use a wire brush to remove any excess mortar from the surface of the slabs.
If desired, you can seal the patio to help protect it from water damage and staining. There are a variety of patio sealers available, so be sure to choose one that is suitable for your patio slabs.
Congratulations, you have successfully repointed your patio! With proper maintenance and care, your patio should look great for years to come.
