How to fix surface water pooling at spot covered by pavers?

Vincero1

The problem

 

I’ve noticed that surface water pools at the front of my house, next to the wall, during rain. It’s not too serious, but it does cause moisture to accumulate. I noticed this when I removed the skirting board and found mould and damp plaster.

 

The ask

I’m hoping to understand how I can adjust the level of the pavers, waterproof the wall, and do anything else I should do to prevent water pooling near the wall.

JacobZ

Hi @Vincero1,

Thank you for your question about addressing drainage issues where pavers sit against the outside wall of your home.

The main issue here is likely inadequate drainage and a fall away from the wall, which allows water to collect at the lowest point near the wall. Ideally, outdoor surfaces should be sloped away from the house to direct rainwater toward a proper drainage point. The first thing to consider is lifting and relaying the pavers with a corrected slope. Aim for a fall of at least 10mm per metre away from the wall. Use a spirit level and straight edge to check the current gradient. You will need to lift the pavers and add or adjust the sand or crushed rock base underneath to create the right angle before relaying the pavers.

While doing this, it’s a great opportunity to assess whether the base layer is compacted and draining well. If the sub-base is made of poorly draining material or has become clogged, replacing it with a crushed rock and bedding sand layer can improve water movement and reduce pooling. Compacting with a tamper will ensure the base is solid and will not be washed away in heavy downpours.

To further manage water, consider installing a channel drain along the base of the wall where pooling occurs. If you go this route, ensure the pavers are cut and fitted properly around the drain so that surface water flows easily into it.

As for protecting the wall itself, applying an exterior grade waterproofing membrane such as this Crommelin Exterior Grade Brushable Waterproofer to the base of the wall will help prevent moisture from penetrating the brickwork or render. 

It’s also worth checking for weep holes around that section of the house. These should never be blocked by pavers or soil, as they allow moisture to escape from the wall cavity. If necessary, you can slightly lower the paver height near the wall to expose these features.

In summary, to fix the pooling issue: correct the fall of the pavers away from the house, improve the base for better drainage, consider installing a drain to capture surface water, and seal the wall to prevent further moisture ingress. These steps, when combined, should protect your home and eliminate damp problems.

Let me know what you think and if you have further questions, please don't hesitate to ask.

Jacob