A hardscape project can look finished on the surface while problems are already developing underneath it. Improper grading can leave a patio holding water, an inadequate base can cause pavers to settle or heave, and poor drainage or structural preparation can contribute to a retaining wall shifting over time.

Rolling Hills Landscapes builds hardscape projects for homeowners throughout Greater Pittsburgh using a consistent process from initial site assessment through final installation. Every project, regardless of size, follows the same basic construction sequence: assess the site, address grading and drainage, complete necessary structural work, prepare and compact the base, and then install the finished hardscape. Following these steps in the right order helps prevent problems that can be difficult and costly to correct later.

Site Assessment & Hardscape Design

The first step is understanding what is already happening on the property.

During the initial site visit, we look at the existing grade, slopes, drainage patterns, soil conditions, access, surrounding structures, and how the proposed project relates to the rest of the property. We also discuss how the homeowner expects to use the space because a patio designed primarily for dining has different requirements than an area that will eventually support an outdoor kitchen, fire feature, or other permanent structure.

This assessment is particularly important around Greater Pittsburgh, where conditions can change considerably from one property to another. Steep and tightly developed properties in communities such as Mt. Lebanon and Bethel Park can create different excavation, drainage, access, and retaining requirements than more open or relatively level sites elsewhere in the region.

Experience working with these conditions helps us identify potential issues during planning rather than trying to correct them after the hardscape is already in place.

Grading & Drainage Come Before Construction

Before patios, walls, steps, or other hardscape elements are built, water needs somewhere appropriate to go.

We evaluate how water currently enters, crosses, and leaves the project area and determine how construction will change those patterns. Depending on the site, preparation may involve adjusting grades, directing surface runoff, incorporating drainage behind retaining walls, or installing drainage components beneath or around hardscape areas.

This work cannot be treated as an afterthought. On sloped properties, uncontrolled runoff can wash material away or place additional pressure behind retaining walls. Improper patio grading can direct water toward the house or leave low areas where water collects. Saturated base material can also contribute to movement when temperatures fluctuate and the ground freezes and thaws.

Correcting these conditions during site preparation is considerably more practical than removing finished work later to reach a drainage problem underneath it.

Base Preparation & Structural Work

Once grading and drainage are established, structural work is completed in the order the project requires. Retaining walls that establish elevations are generally constructed before adjoining patios, while foundations for outdoor kitchens or other substantial features need to be accounted for before the surrounding surface is installed.

For paver areas, preparation includes excavating to the required depth, establishing the grade, installing the appropriate aggregate base in controlled lifts, and compacting each lift before the setting bed and pavers are installed. Driveways and other areas exposed to heavier loads require additional preparation appropriate to their intended use.

Simply placing a thick layer of aggregate and compacting the surface does not create the same stable foundation. Inadequate excavation, base material, or compaction can lead to settling, uneven pavers, failed edges, and movement during freeze-thaw cycles.

Drainage and utility lines, footings, steps, and adjoining surfaces are also sequenced so correct elevations are maintained without having to disturb completed work.

For more information about the finished elements that can be incorporated into a project, visit our Hardscape Features page.

Permits & Local Code Requirements

Some hardscape projects require permits, engineering, or municipal review. Under Pennsylvania's Uniform Construction Code, retaining walls not over four feet in height - measured from the lowest grade to the top of the wall - are generally exempt from a building permit unless they support a surcharge or impound certain liquids. Taller walls and walls subject to additional loads may require further review.

Requirements can also vary among Greater Pittsburgh's boroughs and townships, with different submission and approval processes depending on the project location. Rolling Hills Landscapes accounts for applicable permitting requirements during planning so necessary approvals and engineering can be addressed before construction begins.

Build Your Hardscape on the Right Foundation

Grading, drainage, excavation, base preparation, compaction, and structural work all affect how a hardscape performs over time. Shortcuts during these stages can lead to drainage problems, movement, settling, and repairs that could have been avoided with proper preparation.

Rolling Hills Landscapes plans and builds hardscape projects throughout Greater Pittsburgh with these fundamentals addressed from the start.

Contact Rolling Hills Landscapes at 412-885-7049 or via our online form to schedule a consultation and discuss your hardscaping project.