We have a double garage that I am in the process of renovating.
The current building is about 7.2 meters long (door side + back side) and 6.5 meters wide. Flat roof with approximately 4-degree slope from the door side towards the back, tar paper roof. The garage is attached to the house, which constitutes most of one short side.
The current load-bearing structure consists of 195 mm roof beams that span across the garage roof (from the house to the short side, which is made of brick). The walls are framed with 70 mm studs. In the middle of the garage roof on the inside, there is a steel beam, I-profile (i.e., under the roof beams to support them), and the beam is supported by two smaller free-standing pillars (plus in the wall on each side). It seems that the roof beams are joined above the steel beam, i.e., they overlap.
Now I want to remove the two pillars supporting the beam and replace them in some way. How do I do this in the simplest way?
The current building is about 7.2 meters long (door side + back side) and 6.5 meters wide. Flat roof with approximately 4-degree slope from the door side towards the back, tar paper roof. The garage is attached to the house, which constitutes most of one short side.
The current load-bearing structure consists of 195 mm roof beams that span across the garage roof (from the house to the short side, which is made of brick). The walls are framed with 70 mm studs. In the middle of the garage roof on the inside, there is a steel beam, I-profile (i.e., under the roof beams to support them), and the beam is supported by two smaller free-standing pillars (plus in the wall on each side). It seems that the roof beams are joined above the steel beam, i.e., they overlap.
Now I want to remove the two pillars supporting the beam and replace them in some way. How do I do this in the simplest way?
There are two ways.
1. Replace the I-beam with a stronger one while reinforcing the support points against the floor/ground at the outer walls, as the load there will now be twice as large. But the steel or glulam beam will certainly become ridiculously large, so in reality, it might not be an option.
2. Order roof trusses from a truss manufacturer, this should be solved with a free-spanning truss both as a monopitch roof and with a classic gabled roof. If you can increase the roof pitch, it is an advantage in terms of strength for the trusses.
1. Replace the I-beam with a stronger one while reinforcing the support points against the floor/ground at the outer walls, as the load there will now be twice as large. But the steel or glulam beam will certainly become ridiculously large, so in reality, it might not be an option.
2. Order roof trusses from a truss manufacturer, this should be solved with a free-spanning truss both as a monopitch roof and with a classic gabled roof. If you can increase the roof pitch, it is an advantage in terms of strength for the trusses.
Thank you for the response.
The idea is to build a new metal roof with trusses, but the neighbor next to the garage says no. I will try to apply for a building permit anyway. But if I don't get the permit, it feels pointless to have trusses if I can't get a reasonable angle (I was thinking 9-10 degrees at least).
Is it possible to add more beams under the joists to relieve them? I tried calculating a bit on Moelven's website, and it seems that if I set up three beams, they would be marginally thinner than just one. Is it possible to somehow place beams on the roof's top side and then somehow attach the joists underneath?
The idea is to build a new metal roof with trusses, but the neighbor next to the garage says no. I will try to apply for a building permit anyway. But if I don't get the permit, it feels pointless to have trusses if I can't get a reasonable angle (I was thinking 9-10 degrees at least).
Is it possible to add more beams under the joists to relieve them? I tried calculating a bit on Moelven's website, and it seems that if I set up three beams, they would be marginally thinner than just one. Is it possible to somehow place beams on the roof's top side and then somehow attach the joists underneath?
If there is space above the joist, the load-bearing beam can be placed in the attic space, and with a suitable arrangement "lift" the joist. But keep in mind that the load-bearing beam will probably be quite tall.