What is the SPIDER TIE system?
The SPIDER TIE provides a brand new way to form concrete walls using plastic form ties that stay in the concrete once it has been poured. This system provides a temporary frame work that you attach your plywood panels to using special screws, holding it in place until the concrete has cured. After which you simply unscrew your plywood panel to be used again for future projects. The most ideal applications are for walls up to 4 feet in height. The SPIDER TIE system may be used for walls as high as 9 feet. (See instructions on how to form and pour for taller walls.)
What makes the SPIDER TIE system (I.F.S.) different than insulated concrete forming systems (I.C.F.)?
Insulated concrete forms were designed to provide an insulated concrete wall. The SPIDER TIE system is an entirely new approach or system.(Internal Form Supports) This system was designed as an affordable and much easier way to form concrete walls. No expensive forming systems are required. Virtually no wasted lumber after the pour. The SPIDER TIE system is about 1/6 the cost of a typical I.C.F. system and up to a 30% savings compared to using a typical panel forming system.
How do I calculate the quantity of SPIDER TIES I need for my project?
Our recommendation is to use our free estimator program found on this web site. At least for the first few projects or until you become familiar with the system. The following things need to be taken into consideration.
- Height of wall. This will determine spacing of the SPIDER TIE stacks.
- Thickness of plywood or Form ply to be used.
- Condition of panels to be used. We recommend only using new, dry plywood or Form ply. If you should elect to use less than new panels it may require you to place your SPIDER TIE stacks closer together.
Understanding these three conditions will help to decide the spacing of SPIDER TIE stacks and the quantity of each individual SPIDER TIE stack.
How many SPIDER TIES do I calculate for each stack?
The SPIDER TIE starter piece has a height of 1″. Each individual SPIDER TIE has a finish height of 6″. SPIDER TIE stacks do not have to extend all the way to the top of wood panel. Build stacks to stop within 1-5″ from top of form panels. Complete your forming system by using a starter piece upside down as a finish tie. (See flash demo.)
How many additional stacks do I need for corners and intersections?
When calculating your quantity add 2 additional stacks for each corner and 3 additional stacks for intersections. (Depending on the location of the intersection it may be possible to get by with only 2 additional stacks. The estimator program will always add 3 stacks per intersection to quantity.)
Will the introduction of plastic weaken the concrete wall?
No. Insulated concrete forms or better known as I.C.F.s have been using plastic ties in concrete walls for over 20 years. The SPIDER TIE system actually uses about 50% less plastic ties to achieve the same support.
After removing the wood panel, how do I cover the exposed plastic strip which is the screw flange of the SPIDER TIE?
The process is very much like taping a drywall joint. Instead of using joint compound you use an acrylic base coat.* Apply a 6″ wide by 1/8″ thick layer of acrylic base coat over entire area of exposed plastic. Next apply 2 3/8″ wide strip of fiberglass mesh tape the length of the plastic strip onto the wet acrylic base coat. Using a 6″ broad knife, press the mesh tape firmly and evenly into the acrylic base coat. If necessary apply a second thin layer over mesh tape. Feather in edges of acrylic base coat to smooth out wall. Process should take no more than 15-20 seconds per 4 feet of plastic strip. Allow time to dry. You now have a water proof bridge over the plastic strip ready for additional coatings if desired. For example: foundation plaster above grade, and water proof coating below grade.*Acrylic base coat: The first coat found in all E.I.F.S. stucco systems.(Exterior Insulation and Finish Systems) Products may be purchased at any stucco supply stores.