Can Mortar Be Applied to Brick Slips?
Brick slips are a popular alternative to full-sized bricks, offering the same aesthetic appeal in a thinner, lighter format. They are widely used for feature walls, fireplaces, external facades, and even commercial interiors. One common question that arises during installation is: can mortar be applied to brick slips? The answer is yes — but understanding how and when to use mortar is key to a successful finish.
Mortar and Brick Slips: What's the Role?
Mortar is an essential part of traditional brickwork, and it serves a similar purpose when working with brick slips. Although the slips themselves are not structural, mortar is used to fill the joints between them, giving the appearance of traditional brick bonding. This process is called pointing, and it not only enhances the visual effect but also helps protect the wall from water ingress and dirt buildup.
However, it's important to clarify that mortar is not typically used to fix or stick the brick slips to the wall. Instead, a tile adhesive or brick slip adhesive is used for bonding the slips to the substrate. Mortar is then applied afterward, once the adhesive has cured, to finish the joints.
Types of Mortar for Brick Slips
Not all mortars are created equal. For pointing brick slips, a pointing mortar or gun-in mortar is usually used. This type of mortar is smoother, more workable, and easier to apply into narrow joints using a pointing gun or trowel. It’s also available in various colours to match different styles and finishes.
How to Apply Mortar to Brick Slips
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Allow adhesive to cure: Once the brick slips are bonded to the wall with adhesive, let it set fully—usually 24 hours.
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Prepare the mortar: Mix the pointing mortar to the correct consistency (like peanut butter).
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Apply mortar: Use a mortar gun, piping bag, or trowel to fill the joints between the slips.
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Tool the joints: After allowing the mortar to firm up slightly, use a jointing tool to smooth and shape the joints for a traditional brick look.
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Clean off residue: Once the mortar is firm but not fully dry, clean any excess with a brush or sponge.
Conclusion
Yes, mortar can and should be applied to brick slips—but only for pointing the joints, not for adhering the slips to the wall. Using the right materials and techniques ensures a realistic, durable, and professional-looking brick slip installation that can stand the test of time.