Hello!
I am considering extending my current house with an L-shaped addition over 2 floors. The extension is approximately 6x9 meters, meaning 54 square meters times 2 floors.
On the ground floor, we don't have any interior walls that can support the floor joists for the middle floor. We want the floor beams on the middle floor to be approximately 200 mm since we are connecting it with our old log house which has both low ceiling and floor height.
According to my calculations, I can use 200-mm lightweight beams if I have 3 supports. (Possibly even lower if that's the case; I haven't quite decided yet), with the load-bearing walls and a pillar in the middle; here's my question!
Can I complement with a longitudinal HEA beam OR some other beam as a middle support? It needs to span 9 meters and rest on the load-bearing short walls.
Best regards, Anton
I am considering extending my current house with an L-shaped addition over 2 floors. The extension is approximately 6x9 meters, meaning 54 square meters times 2 floors.
On the ground floor, we don't have any interior walls that can support the floor joists for the middle floor. We want the floor beams on the middle floor to be approximately 200 mm since we are connecting it with our old log house which has both low ceiling and floor height.
According to my calculations, I can use 200-mm lightweight beams if I have 3 supports. (Possibly even lower if that's the case; I haven't quite decided yet), with the load-bearing walls and a pillar in the middle; here's my question!
Can I complement with a longitudinal HEA beam OR some other beam as a middle support? It needs to span 9 meters and rest on the load-bearing short walls.
Best regards, Anton
Feel free to post a simple explanatory sketch of your thoughts to make it a bit easier
What if we flipped the joist and used the interior wall as load-bearing, with a shorter transverse steel beam over the larger room?
Yes, that's very possible! But the length is similar. Then we have a length of 5.5 to 6 meters. Which beam should be used then?
One issue that arises in the first case is that if a 9m long beam is placed with a support ~2-3m from one end, the beam wants to lift at the outer wall, and large lifting forces are needed to hold it back. To counteract this, the beam should be divided at the wall. By flipping the beam, the span becomes ~5.5m instead of ~7m. This essentially halves the deflection.
Beam dimension I will get back to if no one beats me to it.
You have obviously not read my article on different ways to extend at the following link: https://www.byggahus.se/olika-satt-att-bygga-till-huset-guide-och-jamforelse
In this way, you are forced to give the extension poor height dimensions and also cannot choose optimal dimensions for the intermediate floor. It is a waste of money. A glulam beam with the dimensions 215x225 can handle a 6 m span without central support.
In this way, you are forced to give the extension poor height dimensions and also cannot choose optimal dimensions for the intermediate floor. It is a waste of money. A glulam beam with the dimensions 215x225 can handle a 6 m span without central support.