- Inspect the roof to ensure it is clean. Plan the installation sequence and the layout of ROOFMATE™ SL-A boards.
- Lay the separating layer (if required) over the waterproof layer; lap all edges by 200-300mm, at perimeters and penetrations turn up above the installed thickness of the insulation.
- Lay ROOFMATE SL-A insulation boards in brick bond pattern with shiplap edges pushed together firmly (Figure 7).
- Insulate upstands with ROOFMATE LG-A boards (Figure 3).
- Fit ROOFMATE SL-A boards neatly around penetrations (Figure 8). Cut boards with a sharp knife or fine toothed saw.
- Lay ROOFMATE MK or suitable separating layer with 300mm laps at right angles to the slope. Arrange laps to run down the slope (Figure 9). At upstands and penetrations turn up the filter layer so it finishes above the surface of the ballast.
- Lay paving slabs on supports around roof perimeters and penetrations as required.
- Lay the ballast layer progressively. Work on an advancing front away from the point of access so all ballast material is carried across a protected waterproof layer (Figure 10).
Key points
- careful setting out before installation begins will minimise cutting and wastage
- take care not to over-stress any area of the roof while distributing the ballast
- use scaffold boards when barrowing materials over ROOFMATE SL-A boards.