Why Are My Walls Wet After Rainfall?

27 July 2021

When it comes to your property’s structural integrity, you want to be sure that there is no stone unturned when it comes to protection against the elements. However, there are times where you might notice that damp patches have begun to form on the walls within your property, and you could be noticing them even more after heavy rainfalls.

So, why do damp patches appear on your walls, why are your walls wet after heavy rainfall and what can you do to fix these issues?

Why Are My Walls Wet After Rainfall?

Rising damp present on walls

The answer to this question is a lot more straightforward than you might think.

Damp is fundamentally a problem that occurs when there is moisture present in a wall. Realistically, water has to get into your walls somehow, and what’s the most common and recurring way of this happening in Britain? Via rainfall.

So, if your property is suffering from damp, and there is a particularly heavy rainfall it stands to reason that any damp patches you might have will only become more laden with moisture. This means that even when the rain has finished, that water is going to be in your walls, making those damp patches more visible and letting you see them.

That’s the main reason that your walls are wet following a rainfall – the rain has entered your properties walls, saturated them, and made the patches much more noticeable.

Truthfully though, this is a sign that the damp in your walls have reached a crucial and dangerous stage. Not only is there damp in your walls, but there is in fact so much moisture that it is visible on the interior of your home, potentially through elements such as plaster, wallpaper, or whatever else might be applied to your walls.

So, there are two things you need to do to put a stop to those wet walls after a rainfall: understand how those damp patches come to be, and how to stop them.

Why Do Damp Patches Appear on Inner Walls?

As already mentioned, damp is a problem that occurs when there is too much moisture present in a properties walls, or within its masonry. When that moisture builds up within specific areas in the walls, it’s not just the exterior of your brickwork that can present signs of dampness. It can spread to the inside of your property as well.

If enough moisture manages to penetrate your wall, that’s when you will begin to see damp patches appear on your internal walls. That moisture is capable of seeping through whatever might be applied to that wall as well – plaster, chipboard, wallpaper, plasterboard – it can all be ruined by the presence of damp.

How did that damp get in the walls though? Simply put, in one of two ways:

Rising Damp

The moisture has either built up on and within the ground surrounding the property, and through the process of capillary action, has risen to permeate into your properties walls.

This is known as rising damp and is usually brought about by the failure of damp proof measures installed within a home – most commonly a damp proof course. You might well notice that your walls are wet after rainfall if water is pooling outside your property.

As it soaks into the ground following the rain your walls continue to show signs of wetness – this is because of the capillary action that draws moisture upwards is going to keep pulling up that pooled water as it soaks into the earth.

Penetrating Damp

The other form of damp is penetrating damp. This is a form of damp that is incredibly common and is entirely down to a failure within your property. This could be a leaky pipe, a failed cavity wall tie, or even a lintel that is not capable of bearing a load anymore.

In any of these situations, water is going to be able to find its way into your property where it couldn’t before. This water can then seep deeper and further into your walls as rainfall continues, to the point where the damp is capable of showing patches even through your interior wall covering.

So, this is intensely inconvenient and could mean that your property is in danger of developing black mould, having your masonry degrade in quality and even take value away from your properties price. What’s the answer?

How to Stop Your Walls From Being Wet Following the Rain?

Really, when we talk about stopping wetness in your wall after the rain, we are talking about treating damp. Realistically this means one course of action: having your home surveyed and inspected by a damp proofing specialist, who will be able to advise you on the next steps you should take to ensure that your property is safeguarded against the spread of damp.

If you are seeing patches of wetness on your wall that increases and decreases with the rain, then it’s safe to assume you already have a significant damp problem. Don’t wait for it to get any worse and be sure to call our team of specialists today.

Our surveyors can work around your schedule, and our expert technicians are well versed in quick, effective damp proofing that restores your property to a safe, dry state. Call 0800 288 8660 or book a survey online today.