Sandstone Repointing

What Is Sandstone Repointing?

Sandstone repointing is more than just maintenance it’s a careful blend of craft and preservation. Over time, the soft, porous nature of sandstone allows weather and age to wear away the mortar between its blocks. What’s left behind are gaps, cracks, and vulnerabilities that threaten both beauty and structure.

Repointing breathes new life into sandstone. It’s the delicate process of removing deteriorated mortar and skillfully replacing it with new material, matched in color, composition, and texture. Every joint is redrawn with purpose protecting the stone, sealing out the elements, and restoring the original character of the wall.

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Why Should Sandstone Repointing Be Done?

1. Protects the Structure

Over time, mortar joints break down due to weather, moisture, and natural wear. When this happens, water can seep in, freeze, and expand—leading to cracks, stone damage, or even structural failure. Repointing restores those joints and stops the damage in its tracks.

2. Preserve the Stone

When Is The Best Time To Get It Done?

Mortar is essential to holding sandstone blocks in place. As it breaks down, the wall can lose its structural integrity, the best time to do it is in autumn when the weather is relatively mild and dry leading to

Dry weather – Mortar needs time to set without being washed out by rain.

Low wind and humidity – Too much wind can dry out mortar too quickly; high humidity can slow curing.

How Long Is The Process?

The length of the sandstone repointing process can vary depending on the size and condition of the area, but for most projects, it typically takes anywhere from a couple of days to a few weeks. A small section of wall might take just 1–2 days, while a full building façade could take several weeks to complete. The process involves removing the old mortar, cleaning out the joints, and carefully applying new mortar.