ISOLINE LOW LINE for Extra Protection

Climate patterns are shifting rapidly. Modern roofs face more frequent storms, heavier downpours, and intense, wind-driven rain that aggressively forces water upward and underneath tiles. For high-value properties - such as luxury homes, coastal builds, museums, retail projects or commercial spaces - a single leak is a financial disaster.

However, nature is only half the battle; the real danger occurs when changing weather collides with craftsmanship and installation issues. Heavy foot traffic during construction, dropped tools, and sharp tile edges frequently puncture or tear fragile, standard roof underlays before the final tiles are even laid. Furthermore, poorly detailed valleys or incorrectly lapped felts create hidden pathways for water ingress. When standard materials fail behind the scenes, a minor installation mistake quickly escalates into a catastrophic structural leak.

ISOLINE LOW LINE adds a layer of extra protection to your building - acting as a secondary defence shield against both extreme weather and installation issues. Installed directly beneath your tile or slate exterior, it provides an exceptional safety net that keeps the building watertight regardless of site conditions.

While standard roofing felts easily puncture during installation or tear under wind pressure, ISOLINE’s tough, bituminous corrugated structure acts as a rigid integral barrier. It is effectively capable of handling the harshest weather elements even if the primary roof covering fails.

Maximum defence Guarantee: Even if the external tiles are poorly fitted, or if a severe storm rips an entire section of your external roof tiles away, ISOLINE LOW LINE keeps the building completely sealed, dry, and secure. It removes the risk of human error from the waterproofing equation.

The Bitumen Advantage: Self-Healing Protection: One of ISOLINE’s most critical advantages is its bituminous composition. When fixings are driven through the material, the bitumen naturally "closes" around the shank of the nail or screw. This self-healing property creates a permanent, watertight seal at every penetration point, ensuring that even if the roof is subjected to heavy vibration or minor movement, the barrier remains uncompromised.

1. If tiles crack due to poor handling, or shift out of alignment during a storm, water bypasses the primary roof. Instead of hitting a fragile plastic felt that easily pools or leaks, the water lands on the rigid ISOLINE LOW LINE corrugated sheet
2. The unique corrugated profiles act as built-in, individual drainage channels. Any water that gets past the exterior tile layer is immediately and smoothly directed down the valleys of the corrugations straight into the ONDULINE EAVES TRAY and out to the gutters. Water will not collect or stagnate.
3. The corrugations create clear ventilation air gaps both above and below the sheet. This continuous airflow rapidly dries out any ambient internal moisture or micro-condensation, protecting the structural timber rafters from rot.