Dormer construction, remove studs?

[JoKalle]

Hello!

I'm insulating an upper floor in an Älvsbyhus, with raised wall life and a dormer.

The question is, there are 3 pieces of 145x45 studs standing on both sides along the sides of the dormer, toe-nailed into the roof truss construction. I understand that they obviously reinforce the construction, but considering how the structure looks (the dimension of the studs in relation to the fact that it’s only the nails they're attached with that bear any weight) I'm wondering if they mostly end up serving as furring to obtain the "right thickness" of the insulation?

My consideration is if these studs could be replaced with 45x45, while the insulation will be thinner on the dormer’s outer walls, around 190mm, you gain 2dm of space on the width inside the dormer. (which I think is narrow enough as is) The width of the finished space, with the existing studs, will be around 2.5m but could be 2.7m with 45 studs instead. It might be penny-wise but it would give more options for future furnishing. I'm thinking that reinforcements could instead be done inside the truss construction, where it doesn't steal "living space".

Perhaps the pictures explain better what I mean


These studs (note that nothing is placing pressure on them.)


Replace the studs with 45x45 & place 120x45 inside the truss construction (markings)


This is how the dormer looks more in its entirety, I find it very cramped and difficult to furnish, I want to have as much space as possible.
(There are also plans in the future to possibly install full glass in the dormer or open for a door & build an open, or glazed balcony)

Grateful for input, thoughts, and ideas about this.

Regards, Kalle

 

[Jonatan79]

Merry Christmas! Without being a designer, I think it's a bad solution, maybe someone can answer whether it's okay to replace av145 with 45, I would have done it without blinking

 

[JoKalle]

Well, I'm not a constructor either, but as I see it, those extra 10cm rules don't provide any direct benefit as a construction...
The angled nailing is a bit iffy, so it's less than a 45mm rule that holds the nails, which now bear all the load as it is now anyway.

 

[egge80]

Pretty sure they don't carry anything, the idea is that the gable wall should be extended to make room for more insulation! Your solution with insulation works on the lower part, but the gable wall of the dormer, i.e., the triangle above the roof truss, will not be sufficiently insulated if you do it that way!

 

[JoKalle]

Pretty sure they don't carry anything, the idea is that the gable wall should be built out to make room for more insulation! Your solution with insulation works on the lower part, but the gable wall of the dormer, i.e., the triangle above the rafter, will not be sufficiently insulated if you do it that way!

Thanks for the input That's reasonable. Pulled out one of the studs to see, it could be pulled out by hand without tools, 7 half-crooked nails were about 20mm into the rafter... So it didn't serve much purpose as it was anyway

Yes, the insulation would have to give way in that case, it would be 170mm in the triangle itself, but it's the studs above the rafter that are the biggest issue/thermal bridge... There would then only be 45 mm on the inside.

Of course, it's not good for the energy declaration, but the question is how "cold" it would actually be in practice?

One option is to move the outer panel out and insulate outward instead, which could be done afterward if needed... Not a huge job really, but of course cumbersome and it takes time and money. The space inside, on the other hand, is more complicated to change (increase) afterward

You get so many strange ideas when you're in the middle of it...

Edit: Can also add that there will be 280mm of board insulation in vertical walls, and 350mm of loose-fill insulation or similar in the sloped ceiling and 45-50mm on the "wind"

 

[Matti_75]

As you yourself say, when they do nothing. If it gets cold, remove the panel on the outside and install an 80mm västkustskiva on the wind barrier and nail the panel back.

 

[justusandersson]

No. these studs have absolutely no load-bearing function, they are only there to house insulation. Going from 145 to 45 on the sides of the dome is negligible in this context.

 

[JoKalle]

Thanks for all the encouraging responses! Already feels less claustrophobic!


Now I just need to find the time and energy to take down the advent candlesticks too...

 

[Workingclasshero]

Nail your plywood directly so it becomes even wider.

 

[JoKalle]

Nail the plywood directly to make it even wider.

Unfortunately, I'm not quite sure if your answer is honest or just trying to point out my stinginess/ignorance?
But of course, I would like to retain some sort of insulation effect as well. The question is, or it may ultimately be more meant as a reasonable compromise between space, insulation, and construction.

Best regards, Kalle

 

[Workingclasshero]

I unfortunately do not quite understand if your answer is sincere or just pointing out my foolishness/lack of knowledge?
But of course, I want to keep some kind of insulation effect too, the question is, or it at least boils down to maybe more being meant as a reasonable compromise between space, insulation, and construction.

Best regards, Kalle

Hello, no, here we normally ask openly and answer openly.
There are advantages to using 45x45, as there is some space to run electrical in and you get more insulation than plywood, but with plywood, you gain even more space at the expense of insulation unless you use a better insulation.

So this was a well-intentioned tip.

Good luck
/W