The Best Foundation for your Paver Patio
The Best Foundation for your Paver Patio A paver patio often fails the same way a house does. The problems rarely start with what is visible. Most issues begin deep underneath, where no one looks until the damage is done. When the base is weak, even the nicest stone will shift, sink, and crack. That is why choosing the best foundation for paver patio projects is the single most important decision in the whole build. In and around Fredericton, the ground takes a beating every winter. Moist soil freezes, expands, thaws, and then does it all over again. Those freeze–thaw cycles act like a slow jack under your patio. If the paver base material is too shallow, holds water, or is not compacted properly, the patio will heave and settle in just a few seasons, no matter how carefully the pavers were laid. Think of the foundation for your paver patio as an invisible investment. No one compliments the gravel base, but it quietly decides whether the patio looks great for 5 years or for 50. By the end of this guide, it will be clear which base materials stand up to Atlantic Canada’s climate, how the foundation layers work together, and how proper paver base preparation stops problems like sinking, pooling water, and frost heave before they start. Atlantic Hardscape and Concrete has spent more than 15 years building paver patios and walkways in the Fredericton area. Our team sees first-hand what happens when the foundation is done right and when corners are cut. This article shares that experience so homeowners, property managers, and developers can choose the best foundation for paver patio installations that are built to last. Why your paver patio foundation matters more than you think A paver patio looks simple from the surface, but underneath it is a small engineering project. The foundation is the structural backbone that carries the load of people, furniture, vehicles, and even hot tubs. When that backbone is strong and well designed, the stones stay flat and tight for decades. When it is weak, the surface shifts, dips form, and the entire patio paver installation starts to fail. A proper base has four main jobs: Spread weight evenly across the compacted soil so no single paver carries more load than it should. Stop the stones from drifting or separating over time, even under sideways pressure from traffic and frost. Let water move down and away from the patio instead of letting it sit under the stones. Resist frost heave by draining moisture out of the zone that freezes in winter. Fredericton’s climate makes these four jobs even more demanding. Deep frost penetration, heavy fall rains, spring melt, and regular temperature swings put constant stress on any paver foundation. If the base is too thin, built with the wrong gravel base for pavers, or compacted poorly, the ground movement shows up as uneven joints, loose stones, and trip hazards in only a few years. The cost of cutting corners on the foundation often surprises people. Saving a few hundred dollars by using the wrong paver base material, skipping geotextile fabric, or shaving a couple of inches off the gravel depth can turn into a five-figure rebuild later. In many cases, the only fix for a failed base is full removal and starting again from the subgrade. At Atlantic Hardscape and Concrete, we treat the foundation excavation as a system, not a single layer thrown into a hole. Our patios in cold areas are typically excavated 8–12 inches deep, which allows for a thicker compacted base for pavers that drains well and stands up to Fredericton winters. That is how we build the best foundation for paver patio projects that stay level and safe instead of slowly falling apart. The anatomy of a proper paver patio foundation A long-lasting paver patio foundation is built in layers, each with a specific job. When every layer is chosen and installed correctly, they work together like parts of a well-tuned machine. When one layer is skipped or done poorly, the whole system weakens. Knowing these layers helps anyone judge whether a patio base is truly the best foundation for paving stone work or just looks good on the surface. The subgrade – your foundation’s foundation The subgrade is simply the native soil at the bottom of the excavation, but it is far from simple in importance. Every layer above depends on how firm and stable this soil is. If the subgrade is soft, full of roots, or left uncompressed, even the best paver base gravel size and type will not stop the patio from settling. Preparing the subgrade starts with light excavation to the proper depth, then removing all topsoil, sod, and organic material. The soil should be graded with a slight slope for drainage and allowed to dry, because wet clay or mud will not compact properly. Atlantic Hardscape and Concrete uses plate compactors to make several passes over the entire area, which creates a dense, stable base for the rest of the system. In many Fredericton yards, clay-heavy soils need special care. We often excavate a little deeper and sometimes apply dolomitic lime to help improve drainage and soil behaviour before adding any paver base material. This early effort is a key part of the best foundation for paver patio projects. Geotextile fabric – the unsung separator Once the subgrade is compacted, geotextile fabric is often added as a smart insurance layer. This tough, permeable fabric sits between the soil and the base aggregate. Its main role is to keep fine soil particles from creeping up into the gravel base, which would slowly clog the voids, reduce drainage, and weaken the foundation. The fabric also helps hold the base in place and reduces the chance of weeds pushing through from below. For it to work well, adjacent sheets must be overlapped by 15–30 centimetres and carried up the sides of the excavation so there are no gaps. Some installers skip this step, but





































































