Curing Penetrating Damp 0330 0889 552

Wethertex products have over 36 years experience in preventing problems with penetrating damp in external walls and is a range of guaranteed damp-proof coatings,renders and injected treatments to waterproof,protect and eliminate problems associated with damp walls.

mould from damp            * No Wet Patches or Black Mould

            * Damp Walls Allowed to Dry Out

            * No Musty Damp Smells

            * Re-Decoration eliminated

            * Drier & Warmer Room



Wethertex products stop damp penetration by acting as a breathable rain shield to prevent excessive rain-water being absorbed by porous wall surfaces. Your home and your family are protected from even the harshest wind-driven rain and snow of the UK Winter. As a result common problems such as wet patches on the walls or black spot mould will disappear and be guaranteed not to come back.

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penetrating damp in wall

Damp Penetrating the external render

A small amount of moisture in walls is not a problem. In fact it is essential that some water is allowed into the wall and on average an external wall will have around 10% to 15% moisture content.

This small amount of water drops the temperature of the wall to ensure that the warm moist air inside is drawn through to the outside ie the house breathes and regulates the relative humidity levels in the home. This keeps us warm, dry and maintains a healthy ambient  atmosphere.

Unfortunately, due to ageing and erosion porous bricks and external renders lose the ability to resist penetrating damp.

So,if you are having damp problems from poor brickwork,cracked or split wall render or peeling masonry spray paints then call in the leading damp specialists in the UK.

Please continue reading for more damp info……

Removing Render Can Make Damp Walls Worse

penetrating damp ideal conditionsMany old cement renders applied to exterior brickwork contained Lime mixed into the sand and cement which meant it burnt into the brickwork and therefore lasted for many years.

The problem when knocking off old cement renders,is the faces of the bricks have been burnt away and are ideal for penetrating damp.

Spalled bricks absorb water whenever it rains and wet walls cost a lot more to heat than dry walls.



Wethetex Will Guarantee Dry Walls

Penetrating Damp solutions vary but the secret to successfully curing  damp walls permanently is to restore the damp-proofing ability of the wall surface to once more resist rain,wind and frost damage.

It is crucial the wall is not sealed and continues to breathe. This ability to repel wind-driven rain and yet allow moisture vapour to pass through from the inside is known as  microporous.

Wethertex has the most microporous wall coatings in its field and has an unsurpassed reputation for curing damp problems in walls and our coatings are 400% more breathable than most other brands.

Porous Walls Cause Penetrating Dampness Problems

Whilst having an excess of rain water soaking our homes is bad news, there will be no long term damage if remedial action is taken early to

treat damp walls. Visible signs of open or porous masonry surfaces are missing pointing in mortar joints and spalling of brick or stone faces. this is when the outer protective layer has blown off through frost damage as well as the obvious wet or penetrating damp patches  on the inside of the house wall.

For damp walls that have been bitumen painted or cement rendered in a misguided attempt to cure a penetrating damp problem you will often see the paint peeling off. Any tyrolean or pebble dash render will usually have cracks or hollow patches where water gets behind and then soaks into the masonry.

The double whammy is that on frosty nights the water that is held in the body of the masonry will freeze, expand and open up wider cracks and pathways for future rain to enter and spread. This is why we urge you to act as soon as you spot any of the tell tale signs of damp walls.

Curing  Penetrating Damp Problems in Brick, Stone & Concrete Walls

If spotted in its early stages penetrating damp will have only caused minor damage to external brick, stone or concrete surfaces. In this instance it is often possible to effect a minor repair to the damaged mortar joints by repointing missing and loose mortar or repairing small narrow cracks in concrete finishes.

In the event of a few badly spalled bricks or stone slips we can chop these out and replace with new ones to stop penetrating damp from occurring.

Once the mortar or brick face problem has been repaired and made good we apply a specialist microporous clear waterproof coating by low pressure spraying the affected walls. This is a repeat application until the whole area is water repellant and the damp proofing is then complete.

This clear coating is that powerful and effective it comes with its own 10 year Guarantee. For those of you keen to maintain the appearance of your home then damp walls are best dealt with using our clear coat  solution and by injecting a cream into the Damp Proof Course to stop rising damp as well.

For brick or stone walls that have been too badly damaged by rain and frost the best solution is to renovate the whole wall with a breathable specialist coloured wall coating as you would with the below failed sand and cement type renders.

Tyrolean,Pebble Dash,Spar Dash,Cement Render & Penetrating Damp

All these renders are water based and mainly used to cover up spalling or blown brickwork in an attempt to stop dampness from penetrating into the walls . In reality all these sand and cement based wall renders act as a virtual concrete sponge – this can worsen an existing damp problem.  Walls affected by penetrating damp are usually prone to blowing and cracking of the surface in frosty conditions.

Up to 1 gallon of water can be held in each square yard of the Cement render/Tyrolean/Pebbledash and Spar Dash coatings with each individual brick potentially able to hold 1.5 pints of water !!

Because water is held in the outer face,low temperatures will freeze this water, which then expands as it freezes. Cement render/Tyrolean/Pebble dash and spar dash are brittle and will crack and ‘Blow’ under this expansion pressure.This then opens up more areas for the rain to get into and the damp gets worse.

If you see an older property that has cracked, blown or damaged wall rendering that has become porous and hollow, it is a safe bet it was more than likely applied in the first place to cover up porous bricks or stone in a bid to protect damp walls from penetrating damp in heavy rain.

Again,depending upon the amount of damage to the exterior render it may be possible to hollow out the cracks,remove the brittle hollow sections and then repair them. Once the wall render is repaired a through coloured water resistant paint coating should be applied but in a few cases the inherent weakness of the tyrolean or pebble dash means more drastic action is called for.

When the rendering has cracked beyond repair the only solution is to remove it completely,clean the wall down and apply a tried and tested water proof coating that will not only look good for years to come but, crucially, will dry out damp walls for good !!

 Using Masonry Paint to Stop Dampness in Walls

The final old fashioned way of attempting to stop penetrating damp in wet weather is to paint walls with  masonry paint,bitumen or have a silicon spray paint applied. Again, these often fail and signs of peeling and blistering paint show there are still damp walls.

As before if caught very early remedial action may be possible but to prevent a re-occurence it is often best to completely remove the old failing paint and replace with a coating that stops penetrating damp and guarantees no more damp walls.


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