My porch has two pillars by the facade and four at the front by the stairs.
I would like to remove the two innermost ones so that there are only two by the stairs.
Can a 48x220x3100mm beam handle that without starting to bend like a banana?
I don't know what the weight might be on top; it's a normal small roof with gutters on the short sides.
But there must be some calculation method for how close beams need to be.
Since there are gutters on the sides, I assume it's a gabled roof. How big is the roof angle, would you guess, 15 or 30 degrees? Next question, what is the roofing material, metal or tiles? It's also a question of where in the country the roof is located. If it's a metal roof, and you don't live further north than Dalarna, there should be no problems. Unless it's joined or fastened in some unconventional way, anyway.
Snow load zone 2 kN/m²
Concrete tiles.
On top of the bargeboards, I measure 18.6 on one side, 19.4 pitch on the other.
The fastening is not visible from within the attic, so the installation might be of a simpler kind but done by the house builders and approved during the new construction.
If my desire is inappropriate in its current form,
can I then screw on an additional beam on the inside, say it becomes 48x220x3100 + 45x220x3100. Would that strengthen or just add load?
Snow load zone 2 kN/m²
Concrete tiles.
On top of the bargeboards, I measure 18.6 on one side, 19.4 slope on the other.
The fastening is not visible from inside the attic, so the installation might be of a simpler kind but carried out by the home builders and approved at the time of construction.
If my desire is inappropriate in its current form,
can I then screw an additional beam on the inside, say it becomes 48x220x3100 + 45x220x3100? Would that strengthen or just load?
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Low roof pitch, and concrete tiles are things that are less favorable. But you only have snow zone 2.0 which is good. Furthermore, the gable roof must be built with some form of truss. This will take the biggest load and distribute it to the two outermost posts. "All in all" you can safely remove the two middle posts, completely without risk.
1) What is more appropriate to use? Pressure-treated 115x115 spruce with GL30h grading, or pine with GL28h grading? Now that I'm replacing the columns. (I would prefer as few knots as possible, and then pine would be more suitable, but it's weaker?) My goal is to paint them afterwards.
2) I removed the ceiling and saw that the roof trusses are approximately 111cm apart center to center.
And regarding whether my designated beam is strong enough, I see now that beam plus truss is 38cm high.
So, in total, a 48x380mm beam on top of the columns. And the middle columns, which I wish to remove, do not stand on footings under the veranda.
- The next consideration then becomes how the building withstands lateral forces, if the middle columns have such a function.
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