Comparison Table
| ELEMENTS OF STRUCTURE height of top floor not more than 5 metres above ground level for Single and Two storey 2M and 3M buildings |
BRE Assessment |
Building Regulations Approved Document B Appendix A Table A1 and A2 |
Fire resistance in Minutes |
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| External Walls - metal external cladding, metal angle supports & plasterboard internal lining | 25 |
30* |
| Column Casing - steel columns with asbestos or marinite casing (see BRE report) | 90 |
30* |
| Fire Resisting Suspended Ceilings - steel 'J' bars, screwed asbestos ceiling tiles | 30 |
30 |
| Internal Partitions - timber studs with 2 layer 12.5 mm plasterboard both sides | 30 to 60 depending on fixing details |
30 |
| Precast Concrete Floor Slabs - including slabs with suspended ceiling beneath | 30 |
30 |
| Roof Construction |
n/a |
n/a |
| Internal solid masonry wall construction - lift wells, plant rooms, boiler rooms | 60 |
30 |
| * increased to 60 minutes for compartment walls separating buildings |
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