1. steel
| weight | E costs | |||
| Steel coated, corrugated | 8.60 | kg/FE | 0.02 | (eur/year) |
| glass wool 150 | 7.50 | kg/FE | 0.01 | (eur/year) |
| VAPOUR BARRIER | 1.00 | kg/FE | 0.00 | (eur/year) |
| corrugated steel filling | 10.92 | kg/FE | 0.12 | (eur/year) |
| Steel beam Hea 260 | 8.35 | kg/FE | 0.10 | (eur/year) |
| gypsum board 12mm | 1.56 | kg/FE | 0.02 | (eur/year) |
| total | 37.93 | kg/FE | 0.28 | (eur/year) |
Figure 1, life cycle and sub cycles of steel beams.
1.1 life timeThe durable materials will make a longer life of components possible. A technical life of 105 years is realistic with components that last three building uses. The total environmental effects will be divided over this technical life for the effects per year.
1.2 construction strength
If the bay distance is two meter, than 260 mm high beams are sufficient.
1.3 thermal insulation
The 150 mm glass wool results in an Rc value of 4. 1 m2K/W.
2. steel-wood
| Wood shingles 2x 9 mm | 8.64 | kg/FE | 0.01 | (eur/year) |
| plate straw 18 | 8.1 | kg/FE | 0.01 | (eur/year) |
| glasswool 280 | 14.00 | kg/FE | 0.02 | (eur/year) |
| VAPOUR BARRIER | 1.00 | kg/FE | 0.00 | (eur/year) |
| plate corrugated | 9.00 | kg/FE | 0.18 | (eur/year) |
| steel C360/100/38 x 2,5mm | 12.21 | kg/FE | 0.14 | (eur/year) |
| 0.00 | (eur/year) | |||
| total | 52.947 | kg/FE | 0.35 | (eur/year) |
2.1 life time
disassembling possible for reuse: yes
lifetime: 2 building uses = 70 years
Only the wood shingles should be replaced after one building use.
2.2 construction strength
The steel C profiles are spanning the building every meter.
| thickness | 2.5 mm | |
| dimensions | C360/100/38 mm | |
| dead+live load | 1.5 kN/m2 | |
| bending moment | 15.2 kNm | < mmax =" 24"> |
2.3 thermal insulation
The FlexFrame system can fit the criteria if the insulation is thick enough. Because the steel profiles form linear cold bridges of 2.5 mm every meter the thickness of insulation has to be double of the thickness without the cold bridges. Together with 18 mm straw board and wood shingles on top there will be a heat resistance of 4.1 m2K/W.
3 laminated beams
An m2 of roof consists of
| EPDM-membrane 1.14 mm | 1.41 | kg/FE | 0.05 | (eur/year) |
| plate straw 18 | 8.64 | kg/FE | 0.01 | (eur/year) |
| flax wool 140 | 7.00 | kg/FE | 0.02 | (eur/year) |
| FJI joists | 4.93 | kg/FE | 0.03 | (eur/year) |
| Vapour barrier | 1.00 | kg/FE | 0.00 | (eur/year) |
| batters 38x50 /1,2m | 0.7125 | kg/FE | 0.00 | (eur/year) |
| gypsum | 1.56 | kg/FE | 0.06 | (eur/year) |
| 25.25 | kg/FE | 0.17 | (eur/year) |
3.1 life time
Technically these materials could be reused after 35 years. But this would need more labour than new materials. That is why only one building use is prognosed.
3.2 construction strength
If the bay distance is 0.3 m, than 380 mm high FJI-beams are sufficient.
3.3 thermal insulation
The FJI-beams are negligible as cold bridge. The space in between can be used to place 140 mm flax wool insulation that results in an Rc value of 4. 0 m2K/W.
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