| Rooflight
Construction |
Typical
Material Option |
Non-
Fragility class - ification |
Safety
Level |
Roof
Access |
Likely
Period of Non-Fragility |
Lining Panel
Only |
Trilite 2.4 |
Class C |
Minimum |
Not suitable |
Period of Construction |
Lining Panel &
Weather Sheet |
Trilite 2.4 & Trilite 1.8 |
Class B |
Good |
Infrequent |
5 - 20 years |
Lining Panel &
Weather Sheet |
Trilite 2.4 &
Trilite 2.4 |
Class B |
Good |
Infrequent |
25+ years |
Lining Panel &
Weather Sheet |
Trilite 2.4 &
Trilite Ultra 36 |
Class B |
High |
Regular |
25+ years |
Lining Panel &
Weather Sheet |
Trilite 2.4 & Trilite Ultra 45 |
Class B |
Very High |
Frequent |
25+ years |
Lining Panel &
Weather Sheet |
Trilite 2.4 & Safelight |
Class B |
Except ional |
Frequent |
30+ years |
