FASTFOOT®

Installation Guide

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.

Tools & Supplies

  1. Sharp scissors;
  2. Hammer tacker with 3/8" staples;
  3. 2" sheathing tape;
  4. Stakes (either 1x4s, 2x4s or metal stakes, depending on ground conditions);
  5. Hammer for driving stakes;
  6. 1x4s for cleats;
  7. Laser or builder's level for setting height on stakes.
Setup Screed boards

1. Setup Screed Boards

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.

 With fabric, lateral forces are reduced by 60%, but downward pressure on the stake is increased proportionately.

Install Fastfoot Fastfoot Cross section

2. Install Fastfoot®

Pull Fastfoot® between stakes and nail center line to ground to prevent shifting. Allow 10" overlap on all joints.

Place one hand on correct width line on ground and bring fabric edge snugly over the screed board. Staple in position using a hammer taker with 3/8" staples about 12" on center. Reduce spacing for deeper footings.

Ensure the two edges are in line by ensuring the length line (12" on center) is positioned exactly across from the opposite length line. Use edge lines for alignment on the screed board when grade doesn't change.

Attach 1x4s cleats across screed boards to prevent side deflection from concrete pressure. Attaching the cleats beside the stakes increases strength of assembly. Hang steel reinforcing from 1x4s. Ready for concrete.

15" FABRIC HEIGHT RULE - If fabric height is greater than 15", install second 2x4 to reduce bulge and fabric tension.

 

Maximum Footing Size

Narrow: FF50    18" wide x 10" deep

Standard: FF62    24" wide x 13" deep

Wide: FF74    36" wide x 13" deep

Fabric Width Sizing Rule

Width required: footing width + 2 x footing height + 12".

Corner - step 1

Corner - Step I

Run Fastfoot® past corner. Nail off center line and corner diagonal. Staple fabric in position up to corner.

Cut an inverted 'T' on inside fabric as shown. Run top of 'T' the full footing width in one direction, and an equivalent width in the opposite direction. Staple tab #1 to screed board #1.

 

Corner - step 2

Corner - Step II

Lift fabric up at point "F", pivoting roll around outside corner until aligned in new direction.

Corner - step 3

Corner - Step III

Lay down fold "F" and nail to ground. Staple tab #2 to screed board. Corner finished.

T-Junctions

T-Junctions

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.

 

Steps

Steps

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.

 

Rising Damp

Damp Proofing

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 more information on rising damp.

Top of page

Click here for a PDF of the installation guide.

Click here for the Fastfoot® edging installation (for commercial pads, deep and/or wide footings).