BaseShield™ Sub-Base Defence

Raised structures — garden rooms, modular buildings, composite decking and screw pile installations — have become increasingly common across UK residential and commercial settings. Alongside their popularity has come a consistent and frequently underestimated risk: the unprotected sub-base void beneath the structure.

When a building is elevated above ground level on bearers, pads or screw piles, it creates a sheltered cavity directly beneath the floor. This void is warm, dry, protected from weather and largely undisturbed — conditions that rodents actively seek for nesting and harborage. Without physical protection, even a well-constructed garden room or modular building can become compromised within months of installation.

Why garden rooms and modular buildings are particularly vulnerable

Garden rooms are typically constructed to a high standard above ground, but the sub-base is often an afterthought. The focus during construction is on the structure, the insulation, the cladding and the finish. The ground beneath the floor frame receives little attention — and that is precisely where the vulnerability lies.

Rodents beneath garden rooms is a documented and growing issue. Rats and mice exploit the open sub-base, establishing runs beneath the floor insulation, entering the floor void through any available gap and potentially gaining access into the structure itself. The result is insulation damage, soiling, noise and in some cases structural risk to the building's services.

Why sub-base barrier systems are the appropriate response

Pest control treatments address an existing problem but do not prevent future access. A physical sub-base barrier system addresses the root cause: open access to the underside of the structure. Preventing rodent access beneath structures through a physical barrier is the most reliable long-term approach.

Sub-base barrier systems work by covering the entire ground footprint beneath the raised building with a welded wire mesh that prevents rodents from entering the space. The key technical requirements are consistent mesh geometry, adequate wire diameter, suitable corrosion resistance for ground-level conditions and a roll format that allows efficient installation across large footprints.

What makes BaseShield™ appropriate for this application

BaseShield™ SubBase Defence has been developed specifically for sub-base installation beneath raised structures. The 7.66mm clear mesh opening is sized to prevent entry by common rodent species. The hot-dip galvanised finish — applied after welding to protect every joint — provides long-term resistance to the damp, soil-contact conditions present at ground level.

The rolled format — 1m × 25m per roll, covering 25m² — is designed for site practicality. Rather than cutting and manoeuvring rigid sheet sections in a confined sub-base area during construction, the installer can unroll, position and overlap with minimal disruption to the build sequence. This makes installation of the rodent barrier a logical and low-effort step within the standard construction programme.

For builders, contractors and self-build clients specifying raised structures, BaseShield™ SubBase Defence represents the appropriate product category for this requirement — a substructure protection component, not a pest control measure.