Frisco Foundation Repair Co. connects homeowners and property owners looking at drilled bell-bottom piers in Frisco, TX with an independent local foundation company that builds them.
A drilled bell-bottom pier is a reinforced concrete column cast in a drilled hole whose base is flared out like a bell. The wide base spreads the load and helps the pier resist uplift when expansive clay swells, which is why engineers in North Texas often specify them.
How They Are Built
- A shaft is drilled next to or under the foundation beam.
- A belling tool widens the bottom of the shaft.
- Rebar is placed and the shaft is filled with concrete.
- The concrete cures before it carries load, which takes time.
- The foundation is lifted on the cured piers and shimmed.
Where They Fit
- Engineered repair plans for larger houses
- Commercial buildings and heavier loads
- Sites where an engineer wants a pier designed for uplift as well as settlement
What to Weigh
- Schedule: curing adds days to the job.
- Access: drill rigs need room; narrow side yards can be a challenge.
- Cost: generally more per pier than pressed concrete.
- Wet soil: caving or water in the shaft adds steps.
Questions to Ask
- Shaft diameter and depth, and bell size?
- Who designed it, and will I receive the engineering drawings?
- How long will the concrete cure before lifting?
- How will the rig reach the back of the house, and what happens to the drilled soil?
Drilled Piers in North Texas Engineering
Drilled piers have a long history in North Texas construction, where engineers design foundations to resist both settlement and the upward push of swelling clay. When a Frisco repair plan comes from an engineer, especially for a large house or a commercial building, drilled bell-bottom piers may be specified for that reason. If yours is, ask to see the specification and how the contractor will meet it, including inspection of the shafts before concrete is poured.
Access, Spoil and the Yard
Drilling a bell-bottom shaft takes a rig, room to work and somewhere to put the soil that comes out of each hole. On a tight subdivision lot, that can mean removing a fence panel, crossing a neighbor's side yard with permission or hand-carrying spoil to the street. Ask the company to walk the lot with you before the job and explain how equipment will get in, where spoil will sit, how long it stays and who repairs sod, irrigation and beds afterward.
How Long It Takes
Drilled piers usually take longer than pressed piers, partly because the concrete has to cure before the house is lifted onto it. Ask for a start-to-finish schedule, not just the number of drilling days.
Common questions
Why do drilled piers take longer?
The concrete must cure before it can carry the house, so lifting waits until the piers are ready.
Are bell-bottom piers better than steel?
They solve problems differently. Bell-bottom piers rely on their size and shape; steel piers are driven to a recorded resistance. An engineer can explain which fits your site.
How much do bell-bottom piers cost?
Usually more per pier than pressed concrete. Angi's guide lists piers in general at about $1,000 to $3,000 each; ask for an itemized quote.
Can they be installed inside the house?
It is possible but harder because of equipment access. Many plans use drilled piers outside and another method inside.
Do I need an engineer for drilled piers?
They are often part of engineered plans. Ask whether an engineer designed or reviewed yours.
Can bell-bottom piers be added to a repaired house?
Yes, if new movement occurs or an earlier repair needs reinforcement. An engineer's review is a good idea.