Sunday, August 5, 2012

Driveway and Hardscaping

The exterior concrete and aggregate for the house is poured, so the hardscaping is nearly finished. Only a bit of clean-up is left.

Three areas outside the house needed concrete: the entry, the driveway, and the north side of the house (a fairly steep slope shared with our neighbor which needed retaining walls to control erosion).

The relationship between the garage, driveway, and entry was informed by this pattern from A Pattern Language:

Car Connection (113)
  • Problem: The process of arriving in a house, and leaving it, is fundamental to our daily lives; and very often it involves a car. But the place where cars connect to houses, far from being important and beautiful, is often off to one side and neglected.
  • Therefore: Place the parking place for the car, and the main entrance, in such a relation to each other, that the shortest route from the parked car into the house, both to the kitchen and to the living rooms, is always through the main entrance. Make the parking place for the car into an actual room which makes a positive and graceful place where the car stands, not just a gap in the terrain.
  • In our home: It was natural to have the main entry and the garage entry be in the same location. But to really nail this pattern, we chose to forgo any separate garage entry into the house. Whether coming from the garage, driveway, or street, you always come through the same front door. Right now, the driveway is more of a gap in the terrain than a positive and graceful place, but we are going to use landscaping to remedy that (as our neighbors have already started doing to good effect).

Poured driveway
On to the details. The driveway was constrained but straightforward. It connects the private drive to the garage. Due to the hill, it slopes downward. We asked for as smooth a transition as possible to accommodate any low-slung sports cars we may own in the future. The top of the driveway curves north a bit to reduce the elevation change. To add interest and break up the linearity, we continued the curves on the south side of the driveway. A strip drain at the bottom of the driveway will catch water from the garage and driveway.

Entrance hardscape
The entry hardscape provides access from the driveway, garage, and street. A landing at the top joins the driveway and the steps from the street. A wide and long set of shallow steps descends to the front door. A second, less grand set of steps leads from the garage side door and stays under cover of a canopy which will keep us dry when going from the garage to the house.

Entry prepped for pouring
There is a lesson hidden in these stairs: don't be fooled by false economies. We had poured an earlier concrete foundation before the steps were fully designed. There ended up being a few conflicts between the foundation and the final aggregate. In the end, some chunks of concrete had to be chiseled out, and a few of the foundation walls are still visible. They will be cleaned up and finished a bit more before construction is complete. It might seem easier/cheaper to do something earlier (like pour concrete when the truck is going to be onsite for other work), but doing so before design is complete either constrains your design or forces you to undo a bad decision.

Curve on the south side of the drivewayEntry and driveway forms are different than foundation forms. The entry and driveway are wide, thin slabs. The forms are simple boards, with flexible strips forming corners and other curves. The concrete is poured and smoothed, then the top layer is removed to expose the aggregate. This gives a more interesting look and doesn't show wear as much as smooth concrete would.

Graded pathway
The north side of the house looked more like a traditional foundation. This space has the potentia to be a nice area between our house and the neighbor's, but it is rather steep and, without care, would just be a hazardous hill of dirt. Our initial plan was for concrete retaining walls with an aggregate stairway. It would stabilize the slope, give some area for landscaping, and provide a functional path to the backyards. This work would benefit both homes and straddle the property line, so we agreed to split the cost evenly. It was a lot of excavation and concrete work, however, so we ended up scaling back the original design. The retaining walls were the most important part, so those were completed as-designed. The dirt was backfilled around them to stabilize the slope. Later we will add a pathway, but it will probably be a simpler landscape-style pathway with some gravel and wood treads, instead of a full aggregate path.

Landscaping will go around the hardscape a bit later. Plants and softer, less permanent pathways will be added to connect the sidewalk to the entry landing. Much of the landscaping work can be done after move-in by us as we develop the design and actuality of the landscape. The hardscaping is the messier and more difficult work, and it was valuable to complete it along with the rest of construction.

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