In addition to Permaphalt polymer modified mastic asphalt, IKO offers additional British Standard grades of asphalt roofing.
Roofstar Plus offers enhanced flexibility and laying qualities. In addition, it has a polymer modified formulation offering a number of additional benefits such as low temperature stability. Roofstar Plus complies with BS EN 12970:2000-Mastic asphalt for waterproofing.
Roofstar is an economical asphalt roof waterproofing option, and includes Trinidad Lake Asphalt. It complies with BS EN 12970:2000-Mastic asphalt for waterproofing.
Roofing grade mastic asphalt is typically laid in two 10mm coats to a total thickness of 20mm over black sheathing felt.
If the asphalt is be left exposed and used as a walkway, (for example to a small number of flats), then the above grades can be modified on site by adding 10% – 15% of 2mm – 3mm coarse aggregate. The first coat of normal roofing asphalt is laid 10mm thick over the BSF followed by the gritted up roofing that is now laid to a thickness of 15mm. Alternatively, on bigger jobs the 15mm thick top layer of roofing can be supplied pre-gritted. This is called 106 RD Recreational Duty Roofing.
If point loading is anticipated (e.g. on a balcony), the surface should be tiled over two 10mm coats of mastic asphalt roofing to a total thickness of 20mm over black sheathing felt.