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How to Repoint a Patio

By September 29, 2025No Comments

A well-maintained patio can transform your outdoor space into a beautiful, functional area for relaxation and entertaining. However, over time, the pointing between patio slabs—the mortar or sand that holds the joints together—can deteriorate due to weather, foot traffic or general wear and tear. Repointing your patio not only improves its appearance but also prevents water ingress and structural damage. Here’s a detailed guide on how to repoint a patio effectively, helping you restore both the look and longevity of your garden space.

Why Repointing Matters

The joints between patio slabs are vital for stability and durability. When pointing cracks, crumbles or washes away, gaps form where water can seep in. This can cause underlying soil to shift, slabs to become loose or uneven, and weeds or moss to grow in the joints. Repointing repairs these issues and helps keep your patio safe and attractive.

Preparing to Repoint Your Patio

Begin by inspecting the patio to identify areas where pointing is damaged or missing. Clear the joints of loose debris using a stiff brush, a pointing tool or a screwdriver. Removing old mortar completely is essential to ensure the new pointing adheres properly.

If moss or weeds are present, remove them thoroughly and treat the area with a suitable weed killer or moss remover, allowing it to dry before repointing.

Choosing the Right Materials

The choice of pointing material depends on your patio type and personal preference. Traditional mortar mixes made of sand and cement are common for concrete or natural stone patios. Alternatively, a dry mix of sharp sand and cement provides good drainage and flexibility, ideal for patios exposed to frequent rain.

For a more natural look, you can use polymeric sand or resin-based joint fillers available at garden centres. These materials harden quickly and resist weed growth but may require specialist tools for application.

Step-by-Step Repointing Process

Start by preparing your mortar or dry mix according to manufacturer instructions. Aim for a consistency similar to thick toothpaste—firm enough to hold shape but still workable. Lightly wet the joints with water before applying mortar to prevent the dry slabs from absorbing moisture too quickly from the mix, which improves adhesion.

Next, use a pointing trowel or a pointing gun to press the mortar firmly into the joints. Fill them completely, ensuring no gaps remain. Work in manageable sections to prevent the mortar from drying out too fast. Once filled, use the edge of the trowel or a jointing tool to smooth the surface and shape the mortar to match the existing joints. This also helps compact the mix for strength.

While the mortar is still wet, wipe away any smears on the slab surfaces with a damp sponge before it dries to avoid staining. Finally, allow the mortar to cure for at least 24 to 48 hours, avoiding foot traffic and water exposure during this period.

Maintenance After Repointing

After the mortar has fully set, inspect your patio regularly for signs of cracking or wear. Prompt repairs prevent more extensive damage later on. Cleaning the patio regularly and keeping the joints free of weeds will help maintain your pointing.

In Summary

Repointing a patio is a straightforward DIY project that significantly extends the life and appearance of your outdoor space. By carefully preparing the joints, choosing suitable materials and applying the mortar correctly, you can restore your patio’s stability and beauty. With regular maintenance, your repointed patio will provide a safe, attractive area for years to come.

Sam

Author Sam

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