You've decided to protect your brickwork from driving rain.
But there's one obvious problem:
This is Britain. When is the wall ever completely dry?
For homeowners across Bolton considering breathable masonry protection, one of the most common questions is:
"Does my brickwork have to be completely dry before masonry protection can be applied?"
The answer requires a little more explanation.
The wall needs to be properly prepared and sufficiently dry for the specific product and application conditions. But this is different from saying every trace of moisture must have disappeared from deep within the masonry before treatment can ever take place.
With a breathable penetrating product such as ProPERLA Masonry Crème, preparation, weather conditions, substrate condition and—most importantly—the source of any excessive moisture all need to be considered.
🧱 First: Masonry Is Rarely Completely Moisture-Free
Brick, stone and mortar are porous materials.
They naturally interact with moisture from:
- Rainfall
- Humidity
- Internal water vapour
- Ground conditions
- Previous weather exposure
So describing masonry as either simply "wet" or "dry" can be misleading.
The more important questions are:
Why is the wall wet?
Is there an active moisture defect?
Is the surface appropriately prepared and dry enough for treatment?
🌧️ You Shouldn't Simply Apply Masonry Protection To A Wet Wall
Masonry protection shouldn't be treated as something that can simply be sprayed over a visibly wet or saturated elevation.
ProPERLA's application guidance requires the wall to be cleaned and allowed to dry before Masonry Crème is applied. Damaged or missing mortar and cracks should also be repaired beforehand, with repaired mortar allowed to cure.
Preparation isn't an optional extra.
It's part of the system.
🔍 More Importantly: Why Is The Wall Wet?
This is where professional assessment becomes important.
Imagine an external wall is wet because the gutter above it has been overflowing for six months.
Applying masonry protection doesn't repair the gutter.
Likewise, the wall could be affected by:
- Defective pointing
- Cracked render
- Leaking downpipes
- Failed sealants
- Plumbing leaks
- Drainage defects
- High ground levels
These need to be identified rather than hidden beneath a treatment.
Masonry protection should complement good building maintenance—not replace it.
🛠️ Repair Defects Before Applying Protection
Before we consider protecting an elevation, the condition of the masonry needs assessing.
We may need to identify:
✔ Failed pointing.
✔ Cracked or damaged bricks.
✔ Open joints.
✔ Structural or thermal cracking.
✔ Defective sealants.
✔ Damaged render.
✔ Rainwater defects.
ProPERLA's own specification requires damaged or missing mortar and cracking to be repaired before application.
That matters because a hydrophobic treatment isn't designed to bridge significant defects in the building fabric.
🧼 The Wall Also Needs Proper Cleaning
Older external walls frequently contain:
- Dirt
- Atmospheric contamination
- Moss
- Algae
- Lichen
- Biological growth
These can interfere with preparation and application.
ProPERLA specifies appropriate cleaning before application and requires the masonry to be allowed to dry afterwards. Areas affected by moss, mould or fungal growth have additional cleaning requirements.
So the application process actually starts before the masonry protection comes out of the container.
☀️ Weather Conditions Matter
It's not only the wall we're interested in.
We also need suitable environmental conditions.
For ProPERLA Masonry Crème, the manufacturer's specification states a minimum application temperature of 5°C and a maximum relative humidity of 80%. The product shouldn't be applied below 5°C.
This is one reason professional installers pay close attention to the weather forecast.
Rain, temperature and humidity can all affect when an application should take place.
💧 But What If The Wall Has Previously Been Damp?
This is where breathable masonry protection differs from simply covering a wall with an impermeable film.
ProPERLA Masonry Crème penetrates into bare mineral masonry and is designed to significantly reduce liquid water absorption while retaining high water-vapour permeability. The manufacturer reports independent testing to BS EN ISO 7783:2011 and a 96.3% reduction in water absorption.
That means we're trying to achieve two things:
Reduce future rainwater absorption from outside.
while
retaining the wall's ability to allow water vapour movement.
🌬️ Breathability Is Particularly Important
Imagine completely wrapping a damp wall in plastic.
You've stopped rain hitting the masonry—but you've also severely restricted its drying route.
That's why we don't just look for something described as "waterproof."
We're interested in water repellency and vapour permeability together.
ProPERLA states that Masonry Crème penetrates the masonry rather than forming a pore-blocking surface film and has little effect on the substrate's water-vapour diffusion.
This is particularly relevant when considering traditional and older masonry.
🧱 How Does ProPERLA Masonry Crème Work?
ProPERLA Masonry Crème is designed for bare mineral substrates including brick, stone, concrete and sandstone.
Rather than behaving like conventional masonry paint, the treatment penetrates the substrate and chemically bonds with the mineral surface.
According to ProPERLA, it can penetrate up to 17mm, creating a super-hydrophobic treatment while remaining highly breathable.
Once treated, rainwater is encouraged to bead on the surface rather than readily soaking into the masonry.
🌧️ Why Reduce Rainwater Absorption?
Think about an exposed brick elevation through a Bolton winter.
Rain hits the wall.
The masonry absorbs water.
Another storm arrives before the wall has fully dried.
The cycle repeats.
Reducing the amount of rainwater absorbed into porous masonry can help the wall remain drier and reduce one potential mechanism for penetrating damp.
But that only works properly when the wall has been assessed and any underlying defects have been dealt with first.
🧂 What About Salts And Efflorescence?
Moisture moving through masonry can transport soluble salts.
When that moisture evaporates, salts may become visible on the surface as efflorescence.
A breathable treatment can be useful because vapour movement isn't intentionally sealed in.
However, ProPERLA itself makes an important point: if an underlying moisture source isn't dealt with, efflorescence can continue.
Again, the lesson is simple:
Find the moisture source before relying on a product.
🎨 Can ProPERLA Masonry Crème Go Over Painted Brickwork?
Not the clear Masonry Crème.
ProPERLA states that Masonry Crème and its Water Repellent are intended for untreated absorbent surfaces. Its Exterior Façade Coating is the product within the range that can be used on appropriately prepared previously painted surfaces.
That's another reason assessing the existing finish is important before specifying a system.
❌ Masonry Protection Isn't A Substitute For Repairs
This is perhaps the most important part of the article.
If a property has:
a leaking gutter → repair the gutter.
failed pointing → repair the pointing.
cracked render → repair the render.
a plumbing leak → repair the leak.
Masonry protection can then form part of a wider strategy to reduce rainwater absorption where appropriate.
We don't want to use a protective product to hide a defect that should have been repaired first.
🔍 How We Assess A Wall Before Treatment
At Weather Wise Solutions Limited, we consider the condition of the entire elevation before recommending breathable masonry protection.
This may include looking at:
- Brick and stone condition
- Pointing
- Cracks
- Existing coatings
- Render
- Gutters and downpipes
- Sealants
- Ground levels
- Evidence of penetrating damp
- Biological contamination
- Exposure to driving rain
We then determine what preparation or remedial work is required before any protective system is applied.
🛡️ Why Use An Approved Installer?
Application is about considerably more than spraying the product onto the wall.
ProPERLA says its Approved Installer system helps ensure the necessary preparation and remedial work is undertaken before application, while correct professional application also safeguards the manufacturer's product guarantee.
For us, that's exactly how masonry protection should be approached:
Survey → diagnose → repair → prepare → protect.
Not:
See a wet wall → spray something on it.
🏚️ What About Older Properties?
Breathability becomes particularly important when working with traditionally constructed buildings.
Older properties may contain:
- Solid brick walls
- Stone
- Lime mortar
- Lime-based finishes
- Vapour-open materials
These buildings often manage moisture differently from modern cavity-wall construction.
Any external treatment should therefore be considered alongside the original construction and the materials already present.
ProPERLA has also documented use of Masonry Crème on heritage properties specifically where maintaining vapour movement and the natural appearance of masonry were important considerations.
☔ So, Does The Wall Need To Be Completely Dry?
The practical answer is:
The substrate needs to be suitably dry, correctly prepared and within the manufacturer's application conditions—but we shouldn't confuse that with saying a masonry wall must contain absolutely zero residual moisture.
More importantly, masonry protection should not simply be applied to an actively saturated wall without understanding why it's wet.
If there's an unresolved moisture source, fix that first.
If repairs are required, complete them and allow them to cure.
If the wall has been cleaned, allow it to dry appropriately.
Then, once the substrate and weather conditions are suitable, breathable masonry protection can be considered.
📞 Considering Masonry Protection In Bolton?
If your brickwork absorbs large amounts of rain or you're experiencing penetrating damp, Weather Wise Solutions Limited can assess the elevation and determine whether breathable masonry protection is appropriate.
We're a family-run damp and external wall specialist providing:
- ProPERLA masonry protection
- Penetrating damp investigations
- External wall assessments
- Repointing
- Render repairs
- Crack repairs
- Breathable masonry protection
We're proud members of the Damp Proofing Association and the Federation of Damp, with surveyors holding the City & Guilds-recognised Federation of Damp Certified Surveyor (FODCS) qualification.
Book your free quote with Weather Wise Solutions
Learn more about the system directly from ProPERLA UK.