Hello!
I would like to open up between the kitchen and the living room and would like to remove part of that wall. The opening I am considering is drawn in red and would be about 3300mm wide. The wall runs parallel to the ridge and is framed with 45*57mm timber at 600mm centers, with 18mm standing rough board nailed on both sides. The house is 1 1/2-story with a basement, and the kitchen is on the entrance floor. Due to the small dimensions the wall is framed with, I assume the wall has more of a supporting than a load-bearing function? (Perhaps to prevent the floor on the upper level from sagging?)
What I am wondering is what dimension of beam/glulam would be needed to support that opening.
After the wall is removed, 2 roof trusses (collar beams marked green) and 3 floor joists (marked black) would rest on the beam. Below the wall is a masonry wall
200mm hollow block
Of course, I want the beam to protrude as little as possible from the ceiling. Is there a kind soul who could do some calculations on what would be needed for the beam and posts to make this modification? I also attach some plans of the house that might be helpful. Best regards, Lars
I would like to open up between the kitchen and the living room and would like to remove part of that wall. The opening I am considering is drawn in red and would be about 3300mm wide. The wall runs parallel to the ridge and is framed with 45*57mm timber at 600mm centers, with 18mm standing rough board nailed on both sides. The house is 1 1/2-story with a basement, and the kitchen is on the entrance floor. Due to the small dimensions the wall is framed with, I assume the wall has more of a supporting than a load-bearing function? (Perhaps to prevent the floor on the upper level from sagging?)
What I am wondering is what dimension of beam/glulam would be needed to support that opening.
After the wall is removed, 2 roof trusses (collar beams marked green) and 3 floor joists (marked black) would rest on the beam. Below the wall is a masonry wall
200mm hollow block
Of course, I want the beam to protrude as little as possible from the ceiling. Is there a kind soul who could do some calculations on what would be needed for the beam and posts to make this modification? I also attach some plans of the house that might be helpful. Best regards, Lars
Two heart walls, one below and one above the lower one, support the roof trusses. It might be possible to open up with a steel beam in the ceiling, but the size cannot be specified, I can't calculate it, just a rough estimate for myself and not for others. But it entirely depends on how big an opening you want there.
It looks like in the drawing you don't have a favkverkstakstol. Instead, the loads are carried by bending in the underframe. So quite a bit of load from the roof will go down into the wall. I would recommend involving a structural engineer. I guess it will cost you about 8000 kr, which is quite cheap considering the consequences if something goes wrong.
Thank you for the input!
That's correct, they are not trusses but frame rafters. (Finished upper floor where the rooms are 3300mm wide) Of course, I assume the wall between the kitchen and living room is part of the house's structure. I'm pondering a bit on what kind of beam would be needed to support the opening and if it's worth making the modification. How much is actually acceptable for a beam to protrude into the room before it "gets in the way" so to speak—not just hitting one's head on it but also looking awkward and not aesthetically pleasing?
I found a calculation program from Svenskt Trä, if you make an opening of 3300mm, it suggests it would work with a 115*270 mm glulam on two supports in the form of 90*90mm glulam pillars. (Utilization rate 86%) This is in snow zone 3 and assuming I have concrete roof tiles and a finished upper floor with a light joist. The wall I will support is 3 meters into the house, and the house is 7.1m wide. Does that seem reasonable or have I overlooked something?
I have 18 mm rough boarding in the ceiling, so if that were removed, one could recess the beam somewhat and only about 25 cm would protrude from the ceiling. Is that something you believe might be disturbing? Should one rather aim for a steel beam that takes up less space, and if so, what steel beam corresponds to a 115*270?
Another question is the wall under the wall that is to be supported. It is constructed with 20cm concrete hollow blocks. Will it handle the point loads, or does it need reinforcement? Could the pillars be placed on the floor beam resting on the wall, or should the pillar extend down to the masonry and distribute the load by letting the pillar stand on a plank?
Many questions, hope someone can answer so I get an idea if the modification is worth implementing.
That's correct, they are not trusses but frame rafters. (Finished upper floor where the rooms are 3300mm wide) Of course, I assume the wall between the kitchen and living room is part of the house's structure. I'm pondering a bit on what kind of beam would be needed to support the opening and if it's worth making the modification. How much is actually acceptable for a beam to protrude into the room before it "gets in the way" so to speak—not just hitting one's head on it but also looking awkward and not aesthetically pleasing?
I found a calculation program from Svenskt Trä, if you make an opening of 3300mm, it suggests it would work with a 115*270 mm glulam on two supports in the form of 90*90mm glulam pillars. (Utilization rate 86%) This is in snow zone 3 and assuming I have concrete roof tiles and a finished upper floor with a light joist. The wall I will support is 3 meters into the house, and the house is 7.1m wide. Does that seem reasonable or have I overlooked something?
I have 18 mm rough boarding in the ceiling, so if that were removed, one could recess the beam somewhat and only about 25 cm would protrude from the ceiling. Is that something you believe might be disturbing? Should one rather aim for a steel beam that takes up less space, and if so, what steel beam corresponds to a 115*270?
Another question is the wall under the wall that is to be supported. It is constructed with 20cm concrete hollow blocks. Will it handle the point loads, or does it need reinforcement? Could the pillars be placed on the floor beam resting on the wall, or should the pillar extend down to the masonry and distribute the load by letting the pillar stand on a plank?
Many questions, hope someone can answer so I get an idea if the modification is worth implementing.