Plan view tapered insulation panel layout
Assumptions: run = 5.0 m (slope), length = 6.0 m, slope = 2% (20 mm/m)
0
P1
P6
P11
P2
P7
P12
Run (m)
1
2
Slope 2% (20 mm/m)
Total drop = 100 mm
3
4
P3
P8
P13
P4
P9
P14
P10
P15
P5
5
0
1
Drain / Scupper
2
3
Length (m)
4
5
6
Waterproof membrane
Cross-section roof build-up (to scale in vertical exaggeration)
Section across slope
(2% toward drain) Total drop = 100 mm
Tapered insulation
(approx 100 mm at high end)
Parapet / upstand
(Flashing & upturn membrane)
Roof deck / structural sheathing
Drain / scupper
Timber joists (flat)
1. Key: total drop over run = 100 mm (2% slope)
2. Typical tapered polyiso panel sizes: 1.22 x 2.44 m (check manufacturer).
3. Provide continuous membrane with upturn at parapet and proper flashing at drains.
4. Fasten insulation to deck per manufacturer recommendations; consider adhesive or mechanical fixing.