FOUNDATION SCREWS

SPIRAL foundation screws in galvanized steel offer an ecological and economical alternative to the concrete slab. Easy to install and adjustable, they create a stable structure for terraces, carports, shelters or swimming pools, adapt to all types of soil and allow slopes and heights to be managed while preserving the soil.

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An ecological alternative to concrete

SPIRAL foundation screws constitute a innovative anchoring solution which replaces traditional concrete foundations.

This system consists of a threaded galvanized steel rod equipped with a propeller that screws directly into the ground.

Installation requires no excavation or pouring of concrete, thus preserving the integrity of the land. Screwing is carried out manually with a dedicated bar or mechanically using an impact wrench.

This ecological and rapid solution offers professionals considerable time savings: no drying, no earth removal, immediate implementation of the structure.

Suitable for all floors

SPIRAL foundation screws meet the constraints of soft, sloping or unstable ground.

Five models are available depending on the nature of the soil: G-800 for firm soils and embankments (80 cm), G-1200 for loose soils (120 cm), G-1500 for great depths (150 cm), S-1200 specially designed for sand and sandy soils (120 cm), P-800 for fixing posts (80 cm).

The helical thread ensures optimal anchoring in the ground without requiring a deep foundation. The screw compensates for unevenness and adapts to significant slopes thanks to the height adjustment system.

Hot-dip galvanized steel according to EN 1461 guarantees long-lasting anti-corrosion protection, even in extreme climatic conditions.

Quick professional installation

The installation of SPIRAL foundation screws is carried out in a few minutes per anchor point.

Manual screwdriving uses a 160 cm wide bar with adjustable mast and three fixing bolts.

The wrench adapter allows even faster mechanical screwdriving with integrated spirit level to check verticality.

The minimum anchoring depth is 70 cm for the G-800 and G-1200 models, 80 cm for the G-1500.

The adjustable joist support is fixed to the screw head via a threaded rod allowing height adjustment from 0 to 25 cm above ground. The adjustable L-shaped brackets directly receive the joists to create efficient cross-joining.

STRUCTURAL system compatibility

SPIRAL foundation screws integrate perfectly with the Cobra ecosystem to create complete structures.

The double joist system on foundation screws uses STRUCTURAL aluminum joists with dedicated fixing brackets.

This combination offers exceptional spans and overhangs for high or elevated terraces. Additional accessories include the leveling disc to compensate for irregularities, the shimming jumper for the adjustable joist support, and the U-brackets for posts.

Compatibility with HYBRID clips then allows invisible fixing of wood or composite decking.

Multiple applications and uses

SPIRAL foundation screws meet many professional applications beyond wooden terraces. U-shaped supports allow the fixing of posts for fences, gates and pergolas without concrete sealing.

Carports and garden sheds are mounted directly on the structure created by the screws, with guaranteed stability even on soft ground. Public developments use this system to install benches, street furniture and light structures on all types of terrain. Above-ground swimming pools and jacuzzis find a stable and adjustable/adaptable foundation in a few hours.

The versatility of the SPIRAL system makes it a preferred solution for all projects requiring rapid anchoring without heavy masonry work.

Performance and resistance

The galvanized steel used for SPIRAL screws guarantees exceptional durability and corrosion resistance. Hot-dip galvanizing treatment provides long-lasting protection, even in extreme weather conditions.

SPIRAL screws comply with European standards in force for exterior metal structures. The diameter of 60 mm and the thickness of 3 mm ensure solid anchoring in all types of soil. This solution makes it possible to create reliable foundations for terraces, carports and exterior developments without using poured concrete.

Calculation and sizing

The number of foundation screws required depends on the terrace surface, the type of joist and the nature of the ground.

For accurate and consistent sizing, use MyDeckPlanner, our free online configurator. This tool automatically calculates the exact number of SPIRAL screws required according to your project. Simply enter the dimensions of the terrace and the type of structure desired. MyDeckPlanner then generates a detailed layout plan with the complete list of necessary products: foundation screws, supports, brackets and accessories.

A perfect pose, quite simply.

The quality of a terrace depends on its installation. This is why, beyond our innovative bindings, we share our expertise : follow our guides and professional advice for simple, quick and flawless installation. With Cobrafastener, ensure impeccable and long-lasting results.

DISCOVER OUR INSTALLATION ADVICE