The Fastfoot® footing membrane is a cost effective and green method of forming concrete footings. This installation covers strip footings where a single width of Fastfoot® is used to form both sides of the footing.
For wider footings or for deep pads where Fastfoot® only forms one edge of the footing or pad, click here: EDGING INSTALLATION.
Fastfoot® comes in three widths:
Deeper footings can be accomodated wider fabric. Where necessary fabric can be run down each side and the two fabrics nailed into ground to prevent slipage. Note: if the fabric height is greater than 15", install a second 2x4 to reduce the bulge and fabric tension.
FABRIC WIDTH SIZING RULE - Width required = footing width + 2 x footing height + 10".
Layout the outside footing stakes (steel or 1x4s) around the perimeter of the foundation using a string line. Drive the stakes on this line about 6' on center. Reduce spacing for deeper footings or when the ground is less dense.
Drive the inside stakes opposite each outside stake using a 1x2 cut to the footing width.
SOLIDLY attach screed boards to stakes. Fabric tension wants to torque the screed board off the stake. Use two angled nails or one screw per stake of suffient length to penetrate the full depth.
Fastfoot® easily adjusts to different footing depths. Determine the correct location of the fabric edge on the screedboard by:
Using the edge line as determined in step 2, staple both corner edges to the screed boards at 12" on centre, using a hammer tacker with 3/8" staples.
If sewn corners are not available, click here for folding Fastfoot® on corners.
Hammer tack two edges of the Fastfoot® roll on top of the corner fabric with a 10" overlap. Unroll past next corner and cut with a 10" overlap. Hammer tack both edges 12" on center using the predetermined edge line.
Nail center line to prevent movement by wind and concrete. Use sheathing tape on overlaps and nail holes to prevent concrete escaping form and moisture entering footing.
Run fabric through junction. Cut an inverted 'T' in junction area with lower cut along footing width line equal to the width of the footing width lines. Fold and staple tabs.
Run intersecting fabric into junction allowing a 10" overlap. Cut overlap along footing width line, and staple overlaping tabs to screed boards.
Drive pairs of 2x4 stakes into the ground and nail (or screw) to upper and lower screed boards. Drive additional stakes if the distance between the stake and bank is greater than 15". Install lower level Fastfoot®.
Run Fastfoot® up bank to form step. If step is too deep to form with a single width of fabric, either run two widths of fabric (edging) or turn the fabric 90 degrees to obtain the required width.
Install the upper level Fastfoot® with a 10" overlap past top of step. Cut the overlap on the footing width lines, letting the center portion hang down bank.
Screw plywood bulkhead in position and brace. Note that the fabric can also be installed without cutting. Place a fold on the top edge equal to the height of the footing at that point.
Concrete is 'hygroscopic', meaning ground moisture wicks up through the footing concrete and inside the building. Fastfoot® is a vapor barrier which prevents this wicking.
After pouring the footing concrete, leave screed boards in place to hold Fastfoot® in position. Pull Fastfoot® off screed boards and lay under wall forms. Use 2" sheathing tape to hold in position. Form and pour the foundation wall. Then run a 12" width of 'Peel & Stick' along top of footing (covering any staple holes in Fastfoot®) and up the side of the wall. Lap bottom edge of wall membrane over vertical 'Peel & Stick'.
On the inside of the footing, tape the underslab membrane to Fastfoot®.
Click here for the Fastfoot® edging installation (for commercial pads, deep and/or wide footings).