Why use a water repellent? With the right masonry impregnation you can waterproof stone yourself and keep your facade water repellent for years. On this page you will find out which products work, how to prepare a facade and what to pay attention to for a durable result. ✓Protection against...
Water repellent & masonry impregnation – protect your facade (1)
Why use a water repellent?
With the right masonry impregnation you can waterproof stone yourself and keep your facade water repellent for years. On this page you will find out which products work, how to prepare a facade and what to pay attention to for a durable result.
- ✓Protection against driving rain, frost damage, efflorescence and dirt
- ✓Breathable: moisture can escape from the wall while water is repelled
- ✓Invisible: colourless, the original appearance is preserved
- ✓Durable: years of protection with proper preparation and application
Which water repellent suits your substrate?
For facades, concrete and natural stone you work with silanes and siloxanes. They penetrate the pores, react there with moisture and make the material water repellent from within, while the wall stays breathable. A plain silicone oil (PDMS) does not bond chemically to stone and washes out over time. Reactive silicone emulsions are therefore mainly used as an additive in silicone resin paints.
Available to order
BRB Siloen® 5022 WR
Water-based silane/siloxane emulsion for brick, sand-lime brick, sandstone, mineral plasters, aerated concrete, fibre cement boards and non-load-bearing concrete. Also suitable as a water repellent primer under emulsion and siloxane paints.
On request
| Product | Type | Application according to manufacturer | Status |
|---|---|---|---|
| BRB Siloen® 696 | Silane emulsion, water-based | For highly alkaline substrates such as concrete, high resistance to freeze-thaw and de-icing salt. Also as an admixture in non-load-bearing concrete products | On request |
| BRB Siloen® SR 608 | Alkylsilane/siloxane concentrate, solvent-based | Water repellent and primer for mineral building materials, dilutable with solvent | On request |
| BRB Siloen® SR 403 | Reactive silicone oil emulsion, 60 % active | Additive for formulators of silicone resin facade paints, improves water repellency and beading while keeping vapour permeability | On request |
Request these products via info@siliconesandmore.com stating your substrate, application and required quantity.
⚠️ Natural stone: always test on a sample area first, some types of stone may darken slightly or change in sheen.
Making textiles water repellent? That calls for different products. You will find them under silicone emulsions for water repellent textiles.
Waterproofing yourself: step by step
- Inspect and clean: remove algae, salt efflorescence, grease and loose material. Let the wall dry completely.
- Mask: cover windows, frames, metal and plants.
- Sample area: always test 0.5 to 1 m² first for absorption and appearance.
- Apply: saturate wet-on-wet at low pressure (flood coat) or with a roller, working from the bottom up. Follow the dilution and consumption on the product page.
- Finish: wipe excess material off hard surfaces immediately and allow to cure according to the data sheet.
Do
- Dry, clean substrate (RH below 80 %, no rain expected)
- Temperature between 5 and 25 °C, no full sun or frost
- Apply enough material, saturation is key
Don't
- Treat facades with damp problems without fixing the cause
- Spray onto paintwork, glass or metal, this can leave stains
- Overcoat vapour-tight paints or systems, risk of blistering
Substrates: brick, concrete and natural stone
- →Brick and pointing: the standard choice is a silane/siloxane emulsion such as Siloen 5022 WR
- →Concrete: a low molecular weight silane penetrates deeper, for example Siloen 696 (on request)
- →Natural stone: start with a sample area, natural stone is prone to colour deepening
Frequently asked questions about impregnating walls
Which water repellent is best for my facade?
For mineral substrates, silane/siloxane impregnations are the most durable. For most facades of brick, sand-lime brick or render, Siloen 5022 WR is a good choice.
Can I use silicone oil to make my wall water repellent?
We advise against it. Silicone oil does not bond chemically to stone and washes out over time. Silanes and siloxanes react in the pores and give a lasting effect.
How long does a stone impregnation last?
That depends on the substrate, weather exposure and product, but usually several years. Thorough cleaning and full saturation extend its life.
Is there a risk of discolouration?
Colourless products are designed to preserve the appearance. Always test a sample area, natural stone may show a slight difference in shade.
Can I do this myself or should I hire a professional?
With a good step-by-step plan and the right tools you can carry out many projects yourself. For large or delicate facades a professional is a sensible choice.
Advice and ordering
Order Siloen 5022 WR directly, or request one of the other BRB water repellents via info@siliconesandmore.com. Unsure about product choice or consumption? Send us your substrate and surface area.