A concrete truck mixes its load as another truck delivers concrete during a foundation pour
at Trinity Falls in McKinney on Nov. 18, 2019. (Mark M. Hancock / © DFWmark.com)
James Wrigg, project manager with Perry Homes, stands
on a foundation pad at Trinity Falls in McKinney.
A foundation mold complete with tendons awaits a
concrete pour. PVC plastic sheets trap moisture in the pad.(Mark M. Hancock / © DFWmark.com)
Post tension tendons are comprised of a plastic sheath, a
steel cable and grease. An anchor is nailed to the inside of
the slab mold to allow tension to be applied to the cable later.(Mark M. Hancock / © DFWmark.com)
A boom concrete pump with an articulated robotic arm delivers
liquid concrete precisely during a pour in McKinney. A 3,600
square foot slab requires about 110 yards of concrete.(Mark M. Hancock / © DFWmark.com)
Metal post straps and hurricane clips ensure
structural integrity up to 90 MPH wind speeds.
The 10-inch gap between the plastic-covered pad and the frame
mold will become a 30-inch high concrete beam. The concrete
slab will be 4 inches high atop of the beams and plastic.
Workers spread liquid concrete quickly because cement
begins a chemical reaction once it contacts water.
As part of the cure process, cracks in the concrete are
expected. Those cracks close when 3,000 PSI of pressure
is applied to the post tension cables.(Mark M. Hancock / © DFWmark.com)
Untreated redwood separates concrete sections. Driveways and
sidewalks use traditional steel rebar to reinforce the concrete.
4 hours – can walk on it.
12 hours – can drive a nail into it.
45 days – can handle 2,000 PSI of tension (the Perry standard is 3,000 PSI).
For many decades, foundations consisted of steel rebar and
about 12 inches of concrete on unprepared soil. Post
tension foundation techniques were developed in the 1930s.
However, the steel available at the time wasn't up to the task.
Modern post tension foundations became the industry
standard in areas with expansive soil or poor load-bearing
soil during the 1990s. (Mark M. Hancock / © DFWmark.com)
If you’re ready to make the move to a new-built house, you have the right to have your best interests represented by a licensed REALTOR. The builder’s sales agent represents the builder – not you. The builder planned to pay a REALTOR fee. This cost is built into the purchase price. Don’t PAY for services that you don’t get! Contact a qualified REALTOR before you sign anything at the builder’s office. Otherwise, you possibly waive your right to no-cost representation.
DFWmark is certified as a New Home Sales Agent, Green Home Sales Agent in addition to having the Military Relocation Professional (MRP) and Graduate, REALTOR Institute (GRI) designations. I can ease the strain of finding your new-built home with my proprietary research information as well as help you liquidate your current house.
If you plan to purchase a new-construction home, please read these other important posts:
Want to Buy a New-Built House?
New-Build Home Basics