With the population getting bigger, demand for extra habitable space is rising. One way to meet this challenge is the installation of low pitched tiled roofing.
100% leak free for new buildings and renovations
No longer just for single-storey extensions, developments in design mean it can even be used to add a whole extra floor to a building.
Of course, with a low pitch comes the challenge of ensuring the roof is weatherproof. The ISOLINE ONDUTILE underlay system, from Onduline Building Products, is a sustainable ‘roof beneath a roof’ that is designed to be used under clay, slate or concrete tiles. It is engineered to be 100% leak free for new buildings and renovations.
30-year guarantee
Providing durable waterproofing with a 30-year guarantee, it is perfect for projects requiring very low pitches, down to a 12.5°minimum.
The light weight of the bituminous corrugated underlay sheeting makes it easy to carry, handle and fix, and the non-slippery sheets are simple for roofers to cut.
Extra living space
ISOLINE ONDUTILE adapts to each roof structure and the fast weatherproofing and installation saves contractors time and peace of mind on job sites.
Greg Hissey, Technical Sales Manager for Onduline, said: “It is a great selling point for roofing contractors, being able to tell the client ‘we can improve your original project by adding additional habitable space’ without harming the visual environment.
“We managed to encompass an extra floor of apartments on a three block site, and stay within local height restrictions, by reducing the pitch of the roof, which provided additional valuable living space.”
Sustainable solutions
The system provides a perfect waterproof barrier against potential water ingress that may happen over time through a breach in the primary roof covering. The tiles, in effect, become purely aesthetic. Unlike with breathable membranes, any water that does get in is channelled away to the guttering.
ISOLINE roofing underlays also meet the need to offer sustainable solutions, as the material is made of a minimum 50% recycled cellulose fibres, contains no asbestos and does not release any hazardous substances. Importantly, it has BBA certification.
Protection with secondary roofing
Greg added: “In areas such as the North East, South West and Wales, where there is a predominance of slate roofs on older style and heritage properties, the potential opportunities for this type of system are huge.”
Bituminous corrugated roofing underlay sheeting also has the benefit that it does not break down under UV exposure.
With the ISOLINE secondary roofing system installed, roofing contractors can be confident the building will have been protected even during a period of down time.
