Choose a roof underlay that survives site realities and performs for the long haul. Forte 145 is a four‑layer breathable membrane with a reinforced grid that resists nail tears and accidental scuffs while allowing water vapour to escape from the roof build‑up. Supplied in a 50 m × 1.50 m roll (75 m² coverage), the forte 145 membrane is suited to cold ventilated, cold non‑ventilated and warm non‑ventilated systems when detailed to guidance. Crews appreciate how the sheet lays flat, drapes the right amount between rafters and sheds water into the gutter line without pooling at the eaves. In use, the low vapour resistance supports a healthier roof space, helping reduce condensation around timbers and insulation. The membrane’s robust face copes with handling and weather during installation, and its hydrophobic treatment pushes surface water away rather than letting it linger. For refurbishments and new builds that demand strength without sacrificing breathability, Forte 145 brings a practical balance—durable on the tools, predictable in performance and the kind of underlay that quietly protects the envelope day after day.