I have a patio that I plan to enclose with sliding doors, but I'm unsure if the construction will hold. The patio is 6 m wide and 3.5 m deep. The front of the roof consists of a 45x145 beam with a support in the middle (2 pieces of 45x120). Do you think the beam is too weak so that the roof will settle, making it so the doors can't slide?
45x145 is much too weak. It can't be done with construction timber at all; instead, you need glulam. 90x225 is sufficient. It also works with 42x270.
My overhead beam is 45x170 on the terrace, and it is spliced on the center post which is 45x95. I have 2 door sections that are 3 meters each (as you have drawn), and I have no problems opening my doors. The terrace is about 7m wide and about 3.5 meters deep.
I have 45x220 with a 5m span and 3.5m depth. I think it's a bit on the edge with 45x145. Is there a possibility to screw-glue another 45x145? A must is roof snow protection on the residential house.
I shovel the roof if it snows a lot. I was thinking of putting a support in the middle in the winter, but it's been fine.
For someone to completely calculate for you, it's good to know the snow zone. The dimension of the roof beams can be interesting for risk assessing the entire roof construction.
I shovel the roof if it snows a lot. I was thinking of putting a support in the middle in the winter, but it's been fine.
For someone to completely calculate for you, it's good to know the snow zone. The dimension of the roof beams can be interesting for risk assessing the entire roof construction.
Best answer
If snow loads are not considered, almost any dimensions can be used, since the roof's own weight is relatively low. However, I do not think this is a reasonable starting point, and above all, one cannot give advice to others on such premises. It can also be difficult to clear snow from a larger glass roof. The snow load value on the ground in Östergötland varies between 2 and 2.5 kN/sqm. In addition, there might be shape factors due to roof designs that can further increase the values. A competently made dimensioning that considers location and roof size must conclude that glulam is required to achieve an acceptable deflection that does not obstruct sliding doors.