Foundation & Structural Renovations Inc. is the leading expert in the Huntsville, Madison, North Alabama area for repairs on foundations, slabs, basements and retaining walls. We also do structural framing repairs, slabjacking, leveling, deep drilled concrete piers to rock and pressure grouting.
This is the oldest proven method of foundation repair but the
most time consuming. These drilled piers are the only method
used in new construction of commercial buildings, parking garages
and overpasses. Our piers are only a scaled down version
to support the load of the house. Drilled piers are installed on
homes at construction in some areas of the country.
Other easier methods of foundation repair have been developed
over the last 20 to 30 years but none compare to the drilled
piers. We have tried some of these methods in the past but encountered
problems and decided we couldn’t stand behind them.
ADVANTAGES OF DEEP DRILLED PIERS
We know what we bear on! If shallow rock is encountered,
a 1˝" hole is drilled 2' into the rock to verify it is not a thin
layer of rock. Our equipment will also drill through tree roots and
small rock layers. Other methods will stop when they encounter
objects below ground. We space our piers 5' to 6' apart, which is
the maximum recommended by structural engineers, considering
most homes with foundation problems have minimal footings and
no rebar reinforcements. Any farther spacing and the footing may
break between the piers and leveling is restricted. The bearing
area on rock is the full 12" diameter of the pier and we can see the
bottom of the pier shaft and the rock. If rock is not encountered at
a depth of 12' to 14', or deeper if required, the bottom of the pier
shaft is enlarged to 30" with a belling tool.
On rocky mountainside lots, we normally spend more time
with a jackhammer than drilling equipment. Chunk rock or layered
rock is removed with the jackhammer until good rock is encountered
and verified as stated in #1 above. The new concrete
piers are doweled to the rock with rebar to prevent slide of the
piers on the rock.
The 12" diameter pier shaft is filled with 4000 psi concrete,
steel reinforced with four vertical 5/8" rebar the depth of the pier
The center of the pier shaft is placed under the center of the
foundation, not on the outside of the footing supporting a metal
bracket that extends under the footing as some methods are.
The bearing of the footing at each pier location is approximately
20" to 24" rather than 6" to 12" with other methods. The
poured concrete cap between the new pier and footing supports
the existing footing continuously and forms to the irregular bottom
of the footing.
Concrete is forever and never stops getting stronger. Concrete
does not rust.
We are very successful during the leveling process since
we use 20 ton hydraulic jacks at each pier location to raise the
structure. Each jack is raised at a different rate to raise the area
THE FINAL STEP - CLEANUP
We have always taken pride on leaving a yard as good as or better
than it was when we started. This probably accounts for the most
compliments we get. On completion, the area is graded, topsoil
added if required, shrubs replanted if removed and new mulch
placed in the beds around the home if disturbed. Lawn areas are
seeded and strawed. All concrete surfaces are pressure washed.