Roof Coating
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Types and Durability
| Product / systems |
thkness
dft. mm |
UV
resist |
Elongation
break % |
Tensile sg.
N/mm². |
WVT.
gm/m2/d |
Reinforce
req’ment. |
Dry time
|
Water resist (bar)
|
Solids content
|
| Bitumen emulsion |
> 1.5
|
no
|
20 – 50%
|
NA*
|
NA*
|
glass 64 gsm.
|
4 – 6 hrs
|
NA*
|
45 – 60 %
|
| Polymer modified bitumen emulsion |
1.2 – 1.5
|
no
|
100 – 300%
|
0.3 N/mm²
|
3.0
|
glass 64 gsm.
|
4 – 6 hrs
|
2 bars
|
60 %
|
| Coal-tar / bitumen urethanes |
> 1.5
|
no
|
> 900 %
|
2 N/mm²
|
1.5
|
no
|
24 hrs curing
|
3 bars
|
85 %
|
| Polyurethane. aromatic/aliphatic |
1.0 – 1.4
|
yes
|
450% (aro)
180% (ali) |
9.0 ( aro )
19.0 ( ali ) |
24.0
|
glass only at detail
|
6 – 20 hrs cure
|
4 – 6 bars
|
80 -100 %
|
| Unsaturated Polyesters. |
1.5 – 1.8
|
yes
|
65 – 90 %
|
8.5 N/mm2
|
22.0
|
polyester
160 gsm |
4 hrs.
|
NA
|
> 70 %
|
| Acrylic polymers ( polyacrylate ) |
0.8 – 1.2
|
yes
|
350 – 400% ( gel only )
|
16.8 N/mm2.
|
42.0
|
glass csm
>250 gsm |
1 – 2 hrs
|
3 bars
|
55 – 60 %
|
| Neoprene ( choloroprene ) |
1.1
|
yes**
|
1300 %
|
0.8 N/mm2
|
15.7
|
polyester
>90 gsm |
24 hrs
curing |
4 bars
|
50 %
|
| Polyisoprene |
1.0 – 1.2
|
no***
|
> 500 %
|
4.2 N/mm2
|
64.0
|
no
|
2 – 4 hrs
|
4 bars
|
68 %
|
NA* bitumen base physical properties tested differently under SS 133-1987.
yes** although neoprene is generally UV resistant, reflective coating recommended.
no*** polyisoprene oxidises at surface by ” skinning ” but forms protective layer. Reflective coating recommended