Yes, the height is critical and the loft will be low. A slab on grade might be necessary but it's a bit hilly rock, so maybe it's possible to manage a median ground height with plinth. We'll see if the proposal for building notification will be completely removed in the future. This building geometry would suit us.
Not sure if you'll get approval for such a low ceiling height on the ground floor?
Are we thinking of a load-bearing external log wall? In that case, you can build a foundation wall for the log wall, then fill up with insulation on the inside, separate the wall with 20cm PIR, and cast an unreinforced slab internally.
This way, you can put 20cm PIR in the wall without the debated thermal bridge. Then tape the joints on the boards and frame an interior wall with 45mm studs.
The intermediate floor and the rafters will be thermal bridges. You can place PIR on top of the sheathing, giving you exposed rafters inside.
Wooden windows or PVC? Regardless, I think dark gray would look stunning in a log house.
Not sure if you'll get approval for such a low ceiling height on the ground floor?
Are we considering a load-bearing external log wall?
If so, you can build a foundation wall for the log wall, then fill up with insulation on the inside, separate the wall with 20cm PIR and cast a non-reinforced slab internally.
Then you can place 20cm PIR in the wall without the debated thermal bridge. Then tape the joints on the panels and mount an inner wall with 45mm studs.
The intermediate floor and rafters will be thermal bridges. You can place PIR on top of the sheathing, which gives you exposed rafters internally.
Wooden windows or PVC? Regardless, I think dark gray would look stunning in a log house.
Interesting foundation, smart!
Yes, I accounted for rafters in the thermal bridges earlier and it has moderate impact, but nice to have them exposed.
PVC may be good but wooden windows are probably a must here.
Exciting thread and fun project.
I'm not entirely sure if you want to build a house according to a certain standard, like passive house, zero energy, or similar, or if you mostly want it to have low energy usage?
If you're building a passive house and following the requirements, the demands are quite tough (15kWh/m2 for heating and a heating power demand of 10W/m2), and it's very important to think through all connections to make it "thermal bridge-free." All details become important in every aspect. It might not be a good idea to install a fireplace in such a cabin; it will turn into a sauna even with the smallest model.
However, if you're going for a version where you mostly want low energy usage, you can take some shortcuts and mix conventional solutions while adding more insulation. Such a small house will have quite a few actual kWh.
U average is what "applies" to the building envelope. For example, one can have a standard door and compensate for it with thicker insulation or a more centralized house layout.
Exciting thread and fun project.
I'm not entirely sure if you want to build a house according to a certain standard, like passive house, zero energy, or similar, or if you mostly want low energy usage?
If you're building a passive house and following the requirements, they are quite tough (15kWh/m2 in heating and heat demand of 10W/m2) and it becomes very important to think through all the connections to make it "thermal bridge-free," all details become important at every stage. It probably won't be good to install a stove in such a cabin; it will become a sauna even with the smallest model.
If, however, you want to have a variant where you mostly aim to have low energy usage, you can take some shortcuts and mix conventional solutions but add more insulation. Such a small house will have quite a few actual kWh.
A very small stove it will probably be. And you can make a small fire. We have a mini-stove in another house, and you can burn a little kindling or a container of pellets if you just want to get a little heat. If you get out to the cabin and it's 0C, it's fine to make a bigger fire.
The prepper in me wants every house to have a small wood stove.
By the way, you can build the cabin with insulation on the ground without a slab, floor chipboard directly on the PIR insulation. It will have a bit more give, which can be compensated with a board-beam-board construction.
An option if it's tricky to access for casting a slab.
U-value is what "applies" to the building envelope. For example, one might use a standard door and compensate with thicker insulation or a more centralized house layout.
It depends on what you want to achieve; if it's a passive house, I find it hard to see how it would work with a standard door.
What do you mean by centralized house layout and how do you do that with an attefallshus?
A very small stove it will probably be. And then you can make a small fire. We have a mini stove in another house and you can burn with some kindling or a bucket of pellets if you just want to get a little effect. If you arrive at the cabin and it's 0C, you can still make a slightly larger fire.
Aha, then it's not quite down to passive house level you want but rather energy-efficient and maybe down to energy class A?
Aha, then it's not exactly down to passive house level you want, but rather energy-efficient and maybe down to energy class A?
Yes, nothing is set in stone and it leans more towards a very energy-efficient house that can function a bit off-grid in emergencies. So there must be a stove and a small battery storage with solar panels.
I was thinking about solar panels in such a setup. Maybe better to mount them vertically on the south-facing wall so they can provide some even in winter.
The prepper in me wants every house to have a small wood stove.
By the way, you can build the cabin with insulation on the ground without a slab, floor chipboard directly on the PIR insulation. It will be a bit more springy, which can be compensated with a board-beam-board construction.
An option if it's tricky to cast a slab.
Such a construction is not anchored in the ground and can topple in a storm.
Such a construction isn't anchored in the ground and can topple over in a storm.
If you had followed the thread, you would know that we are talking about a load-bearing log wall on an exterior wall and internal insulation.
And it won't topple over in a storm regardless. It depends on the design and total mass. If it’s sealed at the bottom, there isn’t much the wind can lift from. We are not talking about a caravan.
Yes nothing is set in stone and it leans towards a very energy-efficient house that can function a bit off-grid in emergencies. So it must be a stove and a small battery storage with solar panels.
I thought about solar panels in a setup like this. Maybe better to mount them vertically on a wall facing south so they can provide some power even in the winter.
I seem to recall that around a 75-degree tilt facing south would give the most output in the winter in Sweden.
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Ulltand said: