PERMANENT LOST FORMWORK

Stay-in-Place Formwork for Concrete Walls

GooPlast permanent lost formwork — recycled-plastic forms that stay in place after the pour to cast shear, retaining, basement and plinth walls faster, with less formwork labour and built-in insulation.

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Permanent, Stay-in-Place Wall Formwork (Lost Formwork)

Stay-in-place (lost) formwork is a lightweight, modular, permanent form system used to cast reinforced concrete shear, retaining, basement and plinth walls. Made from recycled engineering plastic, the panels stay in place after the pour — an eco-friendly, economical alternative to traditional timber and steel formwork.

Thanks to standard panel sizes, each panel can be carried and assembled by a single worker without a crane. Connected to one another in seconds with plastic locks and pins, the panels adapt modularly to different wall lengths and heights.

With its light weight and fast installation, shear wall formwork significantly reduces labor time and cost on site; as the product stays in place on the surface, it leaves a face that provides added insulation to the structure.

Thanks to its rust-free, rot-free and water-resistant plastic structure, the surface is easily cleaned after application; it can be washed and painted if desired.

The modular design lets you work with the same panels on columns, foundations and wall-column junctions as well as shear walls. With internal and external corner pieces, spacers (spacer connectors) and bracing accessories, the system delivers a complete formwork solution.

GooPlast shear wall formwork features a strong ribbed structure engineered to withstand the lateral pressure of fresh concrete, giving safe and accurate results even on tall pours. Its self-spacing design also removes the need for separate concrete-cover spacers.

Areas of Use

Reinforced concrete shear walls

Retaining and garden walls

Basement and foundation walls

Elevator and stair shafts

Water tank and pool walls

Columns and wall-column junctions

Advantages

When suitable reinforcement is used, the lightweight panels are carried and assembled by hand with no crane or heavy equipment, reducing labor and equipment costs on site.

The engineering-plastic structure does not rust and resists corrosion; it protects the structure even on damp and aggressive ground and provides a long-lasting surface.

The plastic locking system snaps panels together in seconds; thanks to the modular design, the form is set up quickly and easily, shortening application time.

Remaining permanently on the surface, the panels create a face that gives the structure added thermal and moisture insulation.

The water-resistant plastic surface is very easy to clean after application; it can be washed and painted if desired.

Made from engineering plastic, it eliminates timber consumption and significantly lowers total formwork cost.

Application Steps

Reinforcement and Preparation

The wall reinforcement is placed according to the project and the form surfaces are checked.

Joining the Panels

Modular panels are connected with plastic locks and pins to form the wall faces.

Spacing and Bracing

Opposing panels are linked with spacers (spacer connectors); the form is leveled and braced with props where needed.

Concrete Casting

Concrete is poured in a controlled manner and placed with vibration; the strong ribbed structure resists lateral pressure.

Cleaning After Application

Once the concrete has set, the product stays permanently in the structure; it requires no stripping and the surface can be simply cleaned when needed.

Technical Specifications

Form type	Stay-in-place / lost (permanent) formwork
Material	Recycled polypropylene (engineering plastic)
Applications	Shear, retaining, basement & plinth walls
Concrete class	C25 / C30
Concrete cover	Self-spacing — no separate spacers
Added benefit	Built-in thermal & acoustic insulation
Waste	Zero strip-out — stays in place
Certifications	ISO 9001/14001/45001 · CE

Certified — Made by the Manufacturer

ISO 9001:2015ISO 14001:2015ISO 45001:2018CE

Direct from GooPlast — manufacturer, not reseller. Our recycled-plastic systems are applied on landmark projects across Turkey.

Frequently Asked Questions

Yes. Shear wall formwork stays permanently in the structure after the concrete is cast; it is not stripped and provides added insulation on the surface.

No. Because the panels are lightweight, they can be carried and assembled by hand without a crane or heavy equipment.

With its lightweight structure, it is used on reinforced concrete shear walls, retaining and garden walls, basement and foundation walls, elevator/stair shafts, and water tank and pool walls.

It needs no plaster, because a clean plastic surface remains; decorative finishes can be applied over this surface if desired.

No. Since the product is self-spacing, there is no need for separate concrete-cover (spacer) elements.

Lost or stay-in-place formwork is a permanent form left embedded in the concrete after pouring, instead of being stripped away. GooPlast's recycled-plastic wall forms stay in place — speeding construction, cutting formwork labour and adding insulation.

No. Unlike bulky EPS-foam ICF blocks, GooPlast is a thin, high-strength recycled-plastic stay-in-place form for reinforced concrete shear, retaining and basement walls, with a self-spacing concrete cover.

Yes. The stay-in-place form suits plinths, wall bases and footings as well as full-height shear and retaining walls.

Get a Quote for Stay-in-Place Formwork

Fill in the form to receive the most suitable modular wall formwork solution and a price quote for your project; our expert team will get in touch with you.