Estimating Guides - Decra Roof Systems

Decra Stratos Tile Estimating Guide

  1. The Tables below are for estimating purposes only. The figures quoted are based on nominal tile dimensions and are subject to normal manufacturing tolerances.
  2. Count all fractions of tiles as whole tiles.
  3. The table assume a simple mono-pitch or duo-pitch roof construction. More complicated roof structures will entail an additional wastage. We suggest an additional estimating figure of approx. 1.32 tiles x total linear metres of hips and valleys.
  4. Additional wastage will be required at the gables to break bond on tiles. Calculate the total linear meterage of gable/verge and abutment wall and then multiply the result by the wastage factor of 0.4 tiles per each metre.
Rafter length to suit full courses
of tile  including fascia*
Number of tile courses
required
Roof  length using 
barge  covers
Number of tiles 
required
0.280 1                              1.360                       1                        
0.595 2 2.590 2
0.915 3 3.820 3
1.235 4 5.050 4
1.555 5 6.280 5
1.875 6 7.510 6
2.195 7 8.740 7
2.515 8 9.970 8
2.835 9 11.200 9
3.155 10 12.430 10
3.475 11 13.660 11
3.795 12 14.890 12
4.115 13 16.120 13
4.435 14 17.350 14
4.755 15 18.580 15
5.075 16 19.810 16
5.395 17  21.040 17
5.715 18 22.270 18
6.035 19 23.500 19
6.355 20 24.730 20
6.675 21 25.960 21
6.995 22 27.190 22
7.315 23 28.420 23
7.635 24 29.650 24
7.955 25 30.880 25
8.275 26 32.110 26
8.595 27 33.340 27
8.915 28 34.570 28
9.235 29 35.800 29
9.555 30 37.030 30
9.875 31 38.260 31
10.195 32 39.490 32
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