Solutions for Water and Damp in Basements and Cellars

Thousands of properties across the UK have basements and cellars which can be subject to leaks, water ingress and even flooding.

This is because basements and cellars are below ground level, meaning moisture can penetrate through walls, floors and even into the space from above. Flooding due to hard surface run-off into basements has become common in recent years. Care must be taken to prevent moisture ingress, and with regular maintenance these spaces can be kept relatively dry.

To completely prevent the risk of water leaks in your basement or cellar, you should consider structural waterproofing, which can create a permanent dry and habitable living space. This can be a valuable investment for homes and businesses, preventing the risk of flooding and leaks long term.

Leaks in basements can be caused by numerous factors. While some can be mitigated, other factors like the water table, whether the property is in a flood zone or a lack of permeable soil may mean the only way to guarantee a dry basement is installing a waterproofing system.

Factors such as flood risks, ground surface runoff and high water tables can lead to lateral penetrating damp into the below ground space. Factors such as geology, hydrogeology and topography will also have an impact on the extent of moisture penetration from the ground surrounding the basement.

Even in a permeable subsoil, ground water will often require time to fully drain away, and this can result in limited pressure periodically coming to bear against the structure, this is known as a varying water table level.

Basement walls are particularly susceptible to leaks as the surrounding soil becomes saturated from rain or a high water table and the force exerted by groundwater on basement walls and floors which then causes moisture ingress, and in severe cases bowing and cracking of the structure itself. This is commonly referred to as hydrostatic pressure and it can exert massive pressure on walls and floors it comes into contact with.

Deteriorating walls and mortar, hydrostatic pressure and movement over time can lead to cracks in basement and cellar walls. This in turn can allow moisture to penetrate through the masonry and into the interior of the basement.

Moisture will penetrate through porous masonry walls and floors. Improper construction or aging buildings may also cause further leaks and issues.

Gutters and downpipes often overflow and leak, and can cause pools of water to form around your property. Over time this will penetrate into the below ground space, noticeable as damp patches or leaks on the walls and ceiling.

To ensure water from your external drainage is not affecting your basement or cellar, make sure there is no debris blocking the flow of water and drains are working as intended. You may even require a drainage survey to ensure your drains are fit for purpose.

Make sure there are no water pipe leaks that could be causing the leak. A burst mains or sewer pipe could cause moisture to enter the below ground space.

If you already have a Type C cavity drainage membrane waterproofing system installed, it is vitally important to maintain any sump pumps you have installed.

The purpose of a sump pump is to remove excess water from the property, and if these stop working it will eventually lead to flooding and water ingress. If your sump pump has an alarm then you should test it regularly to make sure it will work when you need it to.

Blocked drains can cause water to pool around your property, and must be dealt with immediately, otherwise it will continue to cause problems. A CCTV drain survey can be carried out to find the blockage.

If you require basement repairs to prevent water ingress and leaks, Peter Cox are here to help with qualified surveyors. We can provide you with a simple and straightforward process to stop moisture ingress and add value to your property.

The best way to prevent leaks and water entering your basement and cellar is a comprehensive waterproofing system designed to  BS8102 standard.

The British Standard 8102:2022 ‘Protection of Below Ground Structures Against Water Ingress’ is a code of practice which provides recommendations and guidance for waterproofing below ground spaces. This standard provides guidance for waterproofing, meaning for a dry and habitable living space recommendations must be followed to ensure a robust waterproofing system is designed and installed.

Peter Cox are approved installers of Delta, Koster, Newton and Safeguard waterproofing products, and all of our technicians undergo rigorous in-house and onsite training in order to be able to qualify as a trusted partner.

We are rated ‘Excellent’ with over 2,500 independent reviews on Trustpilot and are a Which? Trusted Trader, CHAS and Safecontractor approved.