Foundation Frame ProWide'406x406

Foundation Frame for ProWide 406×406 – stability, precision and long-term durability

The ProWide 406×406 aluminium foundation frame (9 cm) is designed for the GT404 greenhouse, providing a rigid, perfectly level and long-lasting base for the entire structure. It stabilises the perimeter, supports smooth door operation and helps your greenhouse keep its shape through years of seasonal use and changing weather.

Installing a greenhouse on uneven ground is one of the main reasons alignment issues appear over time: joints are under constant tension, doors start catching and the structure may shift in wind. A dedicated foundation frame for greenhouse stabilises the base, raises the structure above soil moisture and keeps the geometry accurate across the full footprint.

Why a foundation frame is essential

• Stability and levelling: evens out the surface and keeps the greenhouse steady, reducing twisting and movement.
• Moisture protection: lifts the structure by 9 cm, limiting direct exposure of lower profiles to soil moisture.
• Long service life: aluminium will not rust, needs minimal maintenance and stays dimensionally stable.
• Easier installation: acts as a precise installation base, reducing adjustments and improving overall fit.

Installation recommendations

• Level the base before fixing, so the frame sits perfectly horizontal.
• Anchor the frame to a solid foundation – concrete strip, paving, timber beams or screw piles depending on site conditions.
• Check diagonals to ensure the perimeter is square for correct door and panel alignment.
• Provide drainage with a gravel strip around the frame to reduce standing water and mud at the base.

Technical information

• Compatibility: ProWide 406×406 (GT404)
• Height: 9 cm
• Material: aluminium
• Function: base levelling, structural stabilisation and protection against deformation

Summary

The ProWide 406×406 foundation frame is a smart upgrade for precise installation and long-term stability. It improves moisture control at the base and helps your greenhouse look and perform flawlessly season after season.

• Instructions for Greenhouse GT404 Foundations

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