Hi,

I am in the process of selecting a lintel for top-hung bifold door. The lintel span is 4500mm. It will support the ceiling (beams and plaster) and the bifold door. The door weight is 200kg. I used Timber Solutions to do the calculations. Since it didn't cater for my situation, I used two different members:

Lintel Single or Upper Storey Loadbearing Walls: capture1.jpgcapture2.jpgcapture3.jpgcapture4.jpg

Lintels Supporting Concentrated Roof Loads: capture5.jpgcapture6.jpgcapture7.jpgcapture8.jpg

Are the above calculations acceptable? Which one is more suitable?

Any advice is appreciated. Thanks.