Fastfoot® is perfect for forming footings over rocky ground, as the fabric adapts perfectly to the uneven rock, reducing blasting and excavator costs dramatically.

Installations over rock typically provide a ten fold savings in forming costs when using Fastfoot® in place of lumber.

The 2x4 screed boards are held in place with steel stakes or #6 rebar, placed into drilled holes in the rock. Fastfoot® is then attached to the 2x4s to form perfect footings and steps at the exact elevation required.
 

Installing steel stakes

Footings are laid out on the rock, and using a spray can of paint, stake locations are marked. With deeper footings, decrease the distance between the stakes. An electric hammer drill with a 7/8” bit is used to drill stake holes. Each hole takes about 2 minutes to drill (in granite), with 100 holes taking 3 hours.

The steel stakes are placed into the holes, and the metal stakes screwed to the 2x4s at the correct height. Set the 2x4s at the minimum grade to clear the rocks, as footing thickness is not typically a requirement when forming on rock.

If using rebar for stakes, use a 3/4" conduit strap to attach the stake to the 2x4. Click here for more information.
 

Installing Fastfoot®

Fastfoot® is pulled between the screed boards, and stapled in position using a hammer tacker with 3/8" staples. Special adjustment lines on the fabric ensure adequate fabric is allowed for deeper footings.

If engineering requires the footing to be attached to the rock with rebar, simply puncture the fabric with the rebar.
 

Placing concrete

Concrete placement over rock is simplified using Fastfoot® as you are pouring into a closed form, and there is no leakage of concrete.

Stripping time is minimal as the concrete does not come in contact with the steel stakes, allowing for easy removal.