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Penetrating Damp

Penetrating dampness from downpipe

What Is Penetrating Dampness?

Penetrating dampness is quite simple moisture that penetrates through the brick or stone work of your property. This could be happening because there are obvious cracks or gaps in the wall (see associated building works section for solution) allowing rainwater to gain acces. This in turn can soak your internal plasterwork and joinery causing significant damage and a cold spot in the property where condensation can form.

Absorbant brickwork/mortar joints found on many older buildings also plays a key factor when it comes to penetrative dampness and some types of brickwork simply act like a sponge and hold moisture. This is where moss and lichen can grow and when winter arrives the stored water expands causing frost damage and the bricks can fall apart. The technical term for this is 'spalling'.

Significant heat loss from within the property is another reason that penetrative dampness not only affects the property but the property owner as well losing more money on additional heating costs.

Cracked and blown render is a major problem as this will simply let all the dampness seep in behind it, escalting the problem and eventually falling off leaving the underside totally exposed. The underside is usually bad brick/stone work which is extremly absorbant.

Water 'tidal' marks and darker areas of brick/stone work are other signs of penetrating dampness and a simple problem like an overflowing gutter, damaged down pipe or faulty roof can saturate a wall creating this problem.

Have you got Penetrating Dampness?

I have mentioned above the key factors to look out for when trying to diagnose this form of dampness but below they are listed:

  • Cracks, gaps and hairline fractures allow moisture in.
  • Black mould in areas where condensation is unlikely to form.
  • Moss and lichen growing.
  • Frost damge/perished brickwork.
  • Unusually excessive heat loss from certain rooms.
  • Cracked/blown render
  • Darker areas of brickwork or water 'tidal' marks.
  • Overflowing gutters/damaged downpipes

Solution(s) for Penetrating Dampness?

The simple way to solve most damp cases is by a process of elimination. First you need to take a good look at the wall in question and check list through all the points mentioned above to find out where the moisture is getting access to your property. Start at the top and work you way down as penetrating dampness is rainwater and this comes from above.

  • Roofing and guttering needs to be in a perfect water tight condition- any issues here Dynamic can solve them.
  • All cracks in brickwork/render (except hairline) need to be either patch repaired or completely redone- any issues here Dynamic can solve them.
  • Frost damaged brick/stone work needs to be repaired by replacing or turning.- any issues here Dynamic can solve them.
  • Absorbant/damaged mortar needs to be ground out if necessary- any issues here Dynamic can solve them.


Dynamics Clear Exterior Coating:

The best solution to hairline cracks and porous walls found in a vast number of properties is to coat the problem elevation(s) in 3 coats wet on wet with Dynamics Industrial Strength Silicone using a low Pressure electric pump (see picture below).

Unlike many products, coatings applied by Dynamic have the following features/benefits:

  • The material is totally invisible once absorbed. It goes on a milky consistency (thats the silcone resin content thats not found in other products), then absorbs and becomes completely invisible (no shine again like other products) not changing the apperance of the property.
  • Unlike other products Dynamics penetrates the wall upto 6mm deep and is both weatherproof and 'micro-porous' meaning that the wall can still 'breathe' and dry once the product is applied but no more penetrative damp can occur. The product is applied three coats 'wet on wet' and problems such as 'spalling' and 'delamination' are completely eliminated.
  • All cementatious surfaces contain ALKALI and this can soon break down conventional paint. Dynamics coatings have superior ALKALI resistance and are ideal on paint or for painting over.
  • Technology has evolved such that the addition of suitable additives actually bind and strengthen the substrate (brick/stone work). This will extend the life of existing pointing and prevent further erosion.
  • The coating is extremely hard wearing and does not degrade over a 12 to 18 month period like conventional coatings do that are exposed to the Sun's Ultra Violet Rays. In fact Dynamics Coatings are Guaranteed for 30 years and well worth the additional expenditure.

This product conforms and far exceeds BS 6477: 1992 for Substrates 1, 3 and 4. The product is fully micro-porous. This will allow moisture contained within the wall to evolve through the protective barrier and thus naturally dry out the wall. (See Drawings below:)



For free advice and if needed a free quotation please call 0800 019 9553 or click here.        



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  • Diagram showing penetrating dampness can not enter the wall after treatment
  • Spalled brickwork and salt exposure from penetrating damp
  • Applying Dynamics Silicone Wall Coating
  • Diagram showing that the coating allows the walls to breathe and fully dry once applied trapping no moisture underneath

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17 September 2019


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