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How to seal & dustproof an exposed internal brick or masonry wall
How to seal an exposed internal brick or masonry wall

Feb 15, 2021

So, what is the best way to seal & dustproof exposed internal brick and masonry walls?

How do you seal an interior exposed masonry wall?

If you wish to seal and dustproof internal brick walls or natural stone walls, we recommend using Floorseal Interior Brick Sealer & Dustproofer.

Floorseal Interior Brick Sealer & Dustproofer is suitable for sealing old brickwork, new brickwork and masonry. This may be sandblasted surfaces or any soft, friable surface which would benefit from sealing & dustproofing.

How does Interior Brick Sealer & Dustproofer work?

Apply the brick sealer to any porous surface and allow the sealer to be absorbed. You will notice the sealer soaking into the pores of the brick or stone. A small amount of product will also dry on the surface thus binding the surface and preventing dust.

The product resists staining as well as preventing unwelcome dusting. Interior Brick Sealer & Dustproofer is both a sealer and a dustproofer.

One single application is normally sufficient to seal the surface.

When sealing particularly porous surfaces you may wish to apply the sealer twice. Sandblasted brick & masonry is extremely porous and may benefit from an additional application.

How do you seal an interior brick wall?

What should I use to seal an interior brick wall?

Interior Brick Sealer & Dustproofer is an easy & effective way of sealing internal brick walls. It is water based, so low odour; this is an important consideration when applying a sealer in an interior space.

The sealer is non-flammable, therefore suitable for use adjacent to fireplaces or multi-fuel burning stoves.

Interior Brick Sealer & Dustproofer is easy to apply with a brush, sponge or microfibre cloth. For large areas, the sealer can be applied with a low-pressure sprayer, fitted with a coarse nozzle. When spraying take care to remove run off by distributing excess sealer with a brush or roller.

Any obvious excess sealer can be blotted from the surface with cloths or a dry roller. This may occasionally collect in areas where the pointing is recessed or on the surface of a particularly rough stone.

Do you need to seal interior brick walls?

Sealing surfaces to prevent airborne dusting is important in commercial environments. It prevents dust travelling through air conditioning systems contaminating electrical systems and the general working environment.

Soft historic brickwork typically sheds dust when a building dries during or after renovation. Sometimes this occurs slowly as the ambient temperatures within the building increases. Dustproofing these soft friable surfaces stabilises surfaces preventing airborne particles.

It is beneficial to seal any internal brick and masonry surface to prevent dusting and prevent staining. It is also possible to slightly enhance the colour of some natural stone or soft brickwork.

What kind of finish does Floorseal Interior Brick Sealer & Dustproofer produce?

Interior Brick Sealer & Dustproofer dries to a matt finish when applied in one coat. It can also slightly deepen surface colours, enhancing natural earthy tones, veining & shading.

Colour enhancement is most obvious when the sealer is applied to soft & highly porous clay-based red brick. The sealer also colour enhances shading and veining in sandstones.

Enhancing colour often makes the surface seem healthier as the surface appears enriched.

When sealing any surface we recommend testing the sealer on a small area to check for suitability. Brickwork & masonry can react differently to any type of sealer, apply to a small area first and allow the sealer to dry.

One coat of sealer will produce a matt finish.

Is it possible to create a sheen instead of a matt finish?

If Interior Brick Sealer & Dustproofer is applied in multiple coats a subtle satin sheen can be seen. Applying the product with a microfibre cloths ensures a nice even finish.
Applying a few thin coats creates a satin finish which preserves a more natural appearance.

How do you seal an interior exposed brick or masonry wall?

Do you have an internal brick and masonry sealer that will not change the appearance of the surface?

Yes, you could use Floorseal Natural Stone Sealer Breathe on both interior or exterior bricks and masonry. It is a sealer which resists water and oil-based staining and is also breathable. This sealer can be used on both walls and floors.

Please note that Natural Stone Sealer Breathe does not dustproof as it is a full impregnating sealer. This sealer is totally embedded into the pores of the treated material; it does not dry on the surface, so will not dust proof.

Natural Stone Sealer Breathe resists water and oil-based staining. If preventing staining from liquid splashes are your only concern (not dustproofing) it is appropriate for this purpose.

If dustproofing, possibly deepening colour or creating a sheen is required you should use Interior Brick Sealer & Dustproofer. The primary purpose of Interior Brick Sealer & Dustproofer is to prevent dusting leaving a matt finish. It will only acheive a satin finish if you build the product up in thin coats.

Coverage Rates for sealing internal masonry and brick

The coverage rate of Interior Brick Sealer & Dustproofer is approximately 8m2 per litre – when applied in a single application. You may achieve a greater coverage rate on dense bricks or dense masonry. The coverage rate will increase to approximately 20m2 per litre when applying a 2nd coat (if required).

The coverage rate of Natural Stone Sealer Breathe is approximately 8m2 per litre. The 2nd application will achieve approximately 16m2 per litre as the first application will have already reduced the porosity of the material being treated.

Sandblasted surfaces

Please note on highly porous surfaces like sandblasted brick or stone the surface will absorb generous quantities of any kind of sealer.

We recommend pre-cleaning all surfaces by at least brushing and dry vacuuming prior to sealing. Sandblasted surfaces will certainly require vacuuming before any sealing is carried out.

What do you use to clean bricks and masonry before sealing them?

We have produced a separate article for cleaning internal bricks and masonry click here if you wish to view it.

Product page links

1. To view the product page of Floorseal Interior Brick Sealer & Dustproofer please click here.
2. To view the product page of Natural Stone Sealer Breathe please click here.

All the products mentioned in this article can be found on the ‘shop by surface type’ page for brick or masonry please click here.

The information contained within this article is not exhaustive. If you need further information please contact Floorseal on (01484) 861461 or email us info@floorseal.co.uk our web address is www.floorseal.co.uk 

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