Simple Guide to Sealing & Using Terracotta Tiles
This guide explains when terracotta tiles need sealing, which ranges are suitable for indoor or outdoor use, and the basic steps involved.
1️⃣ Can terracotta tiles be used outdoors?
It depends on the range.
✅ Stoneware / Quarry-style ranges
Frost resistant
Anti-slip
UV stable
Suitable for patios, paths and external areas
Do not require sealing for performance
Optional impregnating sealer can be used for extra stain protection
Maintenance is simple — regular cleaning only.
⚠️ Handmade & Traditional terracotta (outdoor use)
Can be used externally in sheltered areas
Must be:
Laid on a solid screed or mortar base
Installed with adequate fall for water run-off
Sealed using a suitable exterior-grade sealer (e.g. matt or colour-enhancing sealer)
As these are natural products, they are not guaranteed frost-proof, but they do offer good frost resistance and have been successfully used outdoors by many customers.
❌ Machine-made interior terracotta tiles are not suitable for external use.
2️⃣ Do terracotta tiles need sealing?
Yes — all terracotta tiles require sealing, with the exception of some stoneware ranges.
Sealing:
Protects against staining and spills
Makes cleaning easier
Enhances the natural colour of the tile
We supply all recommended sealers, oils and waxes. These are straightforward to apply using a brush or paint pad.
3️⃣ Choosing the finish: light or darker look?
Light / natural finish
Use a clear sealer or clear wax
Available in matt, satin or gloss finishes
Retains the natural colour of the clay
Darker / antique finish
Apply a stone oil or boiled linseed oil first
This deepens and enriches the colour
Finish with:
A clear sealer or wax
Or an antique wax for a darker, aged appearance
You can control the final look depending on the products used.
4️⃣ Laying terracotta tiles (basic overview)
Terracotta is a natural material and may have slight variation in size and edge finish.
We recommend minimum 10 mm joints
Use non-pigmented grout to avoid staining the tile
Tiles should be laid on a clean, stable surface
Two common laying methods
Thin-bed installation
For flat, level surfaces
Uses approx. 5 mm adhesive
Faster drying
Recommended for pre-sealed and machine-made tiles
Thick-bed installation
For uneven or irregular subfloors
Uses a thicker mortar bed
Requires longer drying time before sealing
5️⃣ Grouting terracotta tiles
Before grouting:
If using oils to darken the tiles, apply oil first and allow to dry
If not oiling, apply at least two coats of sealer before grouting
This prevents grout from staining the tiles and makes clean-up easier.
After grouting:
Allow grout to dry fully
Apply final coats of sealer to protect both tiles and grout lines
6️⃣ Sealing terracotta tiles — the basics
Tiles must be clean and completely dry before sealing
Use new, clean brushes or pads
Follow manufacturer drying times (these may vary with temperature and ventilation)
The first coat is usually absorbed quickly — this is normal.
As a guide, up to 70% of the sealer may be used on the first coat.
After sealing:
Keep foot traffic to a minimum for the first few days
Sealers continue to cure over several days
7️⃣ A helpful tip before you start
We always recommend testing:
A few sample tiles
Different sealers or finishes
This helps determine:
Porosity
Coverage
Final colour and sheen
Need more help?
You’ll find detailed articles and practical tips on our blog, or you can contact us for advice on:
Tile suitability
Sealer choice
Installation questions
We’re always happy to help you choose the right products for your project.