The pouring of the garage slab (formerly carport) is finally complete. The roof is currently supported by two beams on which the trusses rest and two posts. This will be removed and replaced by the walls I'm building, which will be positioned outside, as you can probably see in the picture.
Here you can see the current load-bearing beams/posts on the hipped roof.
I have planned to build the outer walls with 145x45. I should have an upright stud as a lintel at the top plate, right? This wall will be built in place and not raised, so I must start with the sill and top plate and then set the studs, correct?
Another thing that concerns me a bit is the garage door, which will be 3m wide. Will a regular stud wall with upright lintel at the top plate be sufficient? Or should I place two posts and a glulam beam here? Since it's a hipped roof, the trusses run in both directions.
Another question, should the sill be placed at the edge of the slab? Or should it be positioned a bit inward?
Can this work?
This is with 45x145 studs, and a standing truss that is 45x145 around the entire garage as well as over the garage door. Is a single 45x145 stud lying over the garage door enough?
Double standing 45x145s on each side.
CC is 60 across the entire garage.
I am having difficulty finding information on large openings with a hipped roof. Garages are usually built with a standard roof and roof trusses that only rest on two walls, not like in this case. It seems that a standing 45x145 will indeed be too weak. What do you think about a standing 42x180 glulam beam + a regular 45x145 as a wall plate? That way, I reach about the same dimensions as before.
What should I use to support this glulam beam? 2 glulam posts? Where should I place them and what thickness is reasonable?
I don't know if it changes anything, but when I look at the roof trusses, there is only one roof truss that will be positioned at the garage door opening. It can be seen closest in the image here:
Farthest in the image is the roof truss that is attached to the main house structure and ends up to the left of the garage door in the drawing above.
This one ends up to the right of the door in the corner:
What do you think of the construction below?
Marked in red in the image are 2 pieces of 42x180 glulam beams that are 4.5m long and are supported by two 90x90 glulam columns (marked in green).
They are also supported at the door opening on each side (3m).
Unfortunately not, the wall extends further out than the existing beam does today and unfortunately the one sitting above the "gate" is a bit too high. I've also considered keeping the existing beams while I build a new wall so I can remove them without needing supports. I checked the long "beam" running along the long side, this consists of two 45x220 studs (not even glulam) that are joined and spliced in places. If this has held up to support 6 trusses along the long side, then theoretically 2 42x180 glulam beams should be able to support a truss over the garage opening, right?
Cruzze said:
Svenskt trä has a good calculator for dimensioning beams, etc. [link]
I have tried using it, but unfortunately, there's only the single-story house opening that's closest to my use case, and valmat roof is not available as a roof type?
Marked in black is roughly where the new wall will be, the red arrow points to the current beam, which can be higher because it's in a different location on the roof truss.
As you can see where it is black marked, I don't have quite the same height to work with.
Remove the rule that is applied to get the eaves at the right height. It has no other function
I understand that, there is a risk that the new beam ends up right at the joint between the rafters.
Still leaning towards not reusing the beam, requires me to solve temporary supports in that case, easier to let everything stay until the walls are finished.
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Matti_75 said:
Cruzze said:
