Hi
I am drawing a wood storage with an extended roof over the house's utility entrance. I have an ambition to avoid having a post, but I want to know a bit about what can be done without a glulam beam and other potentially complicated methods.
Would it be possible to make this roof, which is about 120 cm out from the wall, with only joist hangers on the wall studs to then meet crossing beams resting on the storage's roof?
I understand that the joist hanger is strong enough to support the roof. But can it hold the beam extending 120? Maybe a slightly deeper joist hanger?
I’m adding an extra image showing the relevant beams. I've drawn them on top of the roof, but you probably get the idea.
The three blue ones could then sit in joist hangers against the existing house where the outermost end meets a beam resting on the storage walls. The outermost is longer in the picture because I think that it will form the eave overhang in another step. I'm thinking of dimensions like 45x120, but I can definitely scale up a couple of sizes if needed.
Considering that there are those invisible shelf brackets like Ikea has (image URL below), I think it must be possible to achieve something free-hanging if done correctly.
https://m.media-amazon.com/images/I/61InMx0jaEL._AC_SX679_.jpg
The roof will probably be an ordinary metal roof.
What do you think?
Or should I cast the roof? A 50mm reinforced slab should be enough for all of it. Or find someone who can weld a supporting frame for me... Everything is possible, it's just varying levels of smart...
Thanks for the thoughts!
Ps: I’m drawing in SketchUp and I'm not that good with the tool. But I have drawn and calculated approximately the entire house otherwise. But I have nothing that is free-hanging at the end like this.
I am drawing a wood storage with an extended roof over the house's utility entrance. I have an ambition to avoid having a post, but I want to know a bit about what can be done without a glulam beam and other potentially complicated methods.
Would it be possible to make this roof, which is about 120 cm out from the wall, with only joist hangers on the wall studs to then meet crossing beams resting on the storage's roof?
I understand that the joist hanger is strong enough to support the roof. But can it hold the beam extending 120? Maybe a slightly deeper joist hanger?
I’m adding an extra image showing the relevant beams. I've drawn them on top of the roof, but you probably get the idea.
The three blue ones could then sit in joist hangers against the existing house where the outermost end meets a beam resting on the storage walls. The outermost is longer in the picture because I think that it will form the eave overhang in another step. I'm thinking of dimensions like 45x120, but I can definitely scale up a couple of sizes if needed.
Considering that there are those invisible shelf brackets like Ikea has (image URL below), I think it must be possible to achieve something free-hanging if done correctly.
https://m.media-amazon.com/images/I/61InMx0jaEL._AC_SX679_.jpg
The roof will probably be an ordinary metal roof.
What do you think?
Or should I cast the roof? A 50mm reinforced slab should be enough for all of it. Or find someone who can weld a supporting frame for me... Everything is possible, it's just varying levels of smart...
Thanks for the thoughts!
Ps: I’m drawing in SketchUp and I'm not that good with the tool. But I have drawn and calculated approximately the entire house otherwise. But I have nothing that is free-hanging at the end like this.
Last edited:
I wouldn't count on the studs protruding from the exterior wall being able to bear anything other than transferring the roof load down to the exterior wall and further down to the foundation. In other words, absolutely 0 Nm in torque.
The entire roof load must be supported by a longitudinal beam at the front edge of the roof (the orange beam in your picture). This limits how far it can be between the woodshed wall and the roof slope on the short side over the entrance.
Assuming the roof over the entrance is about 120 x 120 cm, maybe two glued and nailed beams of 45x195 could handle it. A rough guess though.
Metal roofing isn't that heavy, but it depends on the snow load/snow zone.
The entire roof load must be supported by a longitudinal beam at the front edge of the roof (the orange beam in your picture). This limits how far it can be between the woodshed wall and the roof slope on the short side over the entrance.
Assuming the roof over the entrance is about 120 x 120 cm, maybe two glued and nailed beams of 45x195 could handle it. A rough guess though.
Metal roofing isn't that heavy, but it depends on the snow load/snow zone.
Thanks for the reply!
You might be right. I share your worldview, I just thought there might be joist hangers that were absurdly deep, so they hold the beam in place, even though it juts straight out from the wall.
If I raise the ceiling a bit, I can extend the beams through the attic. Then I'm quite sure it will be strong enough, but the ceiling will need to be a couple of decimeters higher because of the 2.70 ceiling height inside.
Then I could extend, for example, 170 or 145 beams that are mounted in the rafter half a meter in, maybe on cc40 on the outside. That feels quite strong.
When you think about entrance roofs like these, they are undeniably strong enough even though they are thin. I wish I could weld, because then it might be easier.
https://www.byggmax.se/entretak-alu...EJFjkl0VgBppXXSdbHVaEaAnsSEALw_wcB#913=105884
I hope to find a solution, even if it becomes a bit tricky. I don't know why I so desperately want to avoid the corner post. It's probably a matter of pride.
You might be right. I share your worldview, I just thought there might be joist hangers that were absurdly deep, so they hold the beam in place, even though it juts straight out from the wall.
If I raise the ceiling a bit, I can extend the beams through the attic. Then I'm quite sure it will be strong enough, but the ceiling will need to be a couple of decimeters higher because of the 2.70 ceiling height inside.
Then I could extend, for example, 170 or 145 beams that are mounted in the rafter half a meter in, maybe on cc40 on the outside. That feels quite strong.
When you think about entrance roofs like these, they are undeniably strong enough even though they are thin. I wish I could weld, because then it might be easier.
https://www.byggmax.se/entretak-alu...EJFjkl0VgBppXXSdbHVaEaAnsSEALw_wcB#913=105884
I hope to find a solution, even if it becomes a bit tricky. I don't know why I so desperately want to avoid the corner post. It's probably a matter of pride.
The size, roof slope, and how easily the snow remains are crucial for sizing/load-bearing capacity. Every extra centimeter of overhang significantly increases the load.
With the design/style of your house, it's understandable not to want a corner post. Perhaps my gut feeling for what's needed is a bit exaggerated, but at the same time, it's not worth risking the roof collapsing from a severe winter storm. Have you visited Svenskt Trä's website? Perhaps they have sizing examples for overhanging roofs, (or floors/porches/balconies). The latter likely require even sturdier constructions as they need to be walkable, but it might still provide an idea.
With the design/style of your house, it's understandable not to want a corner post. Perhaps my gut feeling for what's needed is a bit exaggerated, but at the same time, it's not worth risking the roof collapsing from a severe winter storm. Have you visited Svenskt Trä's website? Perhaps they have sizing examples for overhanging roofs, (or floors/porches/balconies). The latter likely require even sturdier constructions as they need to be walkable, but it might still provide an idea.
The good thing is that half of the roof is already covered by the house's large 60 cm eaves.
Then I think that the orange-colored beam in the picture, the one resting on the rest of the wood storage, could actually be several. In theory, it could be 3 beams with cc-30, which of course relieves the construction that hangs on the house's wall.
I have looked a bit at Svenskt Trä now but haven't found anything relevant. But I don't know exactly what to search for either. There might be a relevant keyword I'm not finding.
Then I think that the orange-colored beam in the picture, the one resting on the rest of the wood storage, could actually be several. In theory, it could be 3 beams with cc-30, which of course relieves the construction that hangs on the house's wall.
I have looked a bit at Svenskt Trä now but haven't found anything relevant. But I don't know exactly what to search for either. There might be a relevant keyword I'm not finding.