With the home improvement season gaining momentum and permitted development rules relaxed, roofing contractors are looking for the best solutions to meet a growing demand for house extensions.
ISOLINE ONDUTILE roofing sheets, the BBA certified secondary roofing system from Onduline Building Products, provides a secure but lightweight waterproof barrier that’s designed to be fitted below traditional tiled roofs.
Ideal for beneath concrete, slate or clay tiles, it is perfect for very low pitch roofs, providing long-term protection against any potential water ingress that may happen over time through a breach in the primary roof covering.
Properly installed, the pitch can be as low as 12.5° for interlocking concrete tiles, 17.5° for clay pantiles, natural and fibre cement slates, and 22.5° for plain double lap tiles.
Bituminous corrugated sheeting
100% Leak Free
ISOLINE ONDUTILE bituminous corrugated sheeting is engineered to be 100% leak free for both new buildings and renovations, and it will provide durable waterproofing with an appealing 30 year guarantee.
Sean Whiteside, Technical Sales Manager for Onduline Building Products, said recent rule changes allowing home owners to add extra storeys to their houses are sure to create exciting opportunities for the roofing trade in 2021.
Heritage buildings and extensions
Original tiles can be matched
He said: “The beauty of low pitch roofs is that the habitable area can be increased substantially without having to make the compromises on space that can come with the steeper slope of a traditional pitch.
“Also, a requirement of the updated Permitted Development regulations is that the same, or similar, materials used for the original building must be used for the extension.
“Introducing a low pitch using ISOLINE ONDUTILE roofing panels means the original tiles can be matched, with the roofing contractor and their customer confident in the knowledge the roofing element is robust and watertight.”
Lightweight and sustainable
Easy to carry, handle and fix
Another advantage for roofing contractors is the light weight of the bituminous corrugated underlay sheeting, which makes it easy to carry, handle and fix, and the non-slippery sheets are simple to cut.
The material is also in line with the growing awareness of ‘green’ issues and the need to offer sustainable solutions, something the roofing contractor can put forward to customers as another benefit.
ISOLINE Ondutile underlay sheets are made of a minimum 50% recycled cellulose fibres, contain no asbestos and do not release any hazardous substances.
Multiple benefits
- Thermal insulation – the provision of an ISOLINE ONDUTILE secondary roofing system significantly improves the thermal performance of the roof structure.
- Sound insulation – provides a 27% reduction in sound penetration through the roof covering.
- Ventilation – sheet corrugations supply 17000mm2 per linear metre ventilation above the sheet into the tile batten cavity and below into the roof space.
- Moisture control – tile battens positioned above the corrugations allow moisture to drain to the eaves which, with enhanced ventilation, maintains excellent moisture control within the cavity.
- Safety – forms a tough, non-reflective and safe working environment during roofing works.
