I am going to draw in the outer walls on a sketch to send to house manufacturers and I am hunting for centimeters in the floor plan and need to know where the inside of the outer walls will be.

I have a basement foundation of Lecablock, let's say it is 4.50m internally and 5.10m externally, which means 30 cm thick blocks.

I want walls that have - counted from the inside - plasterboard (13 mm), plywood (12 mm), installation layer (45 mm), plastic, load-bearing structure with insulation, additional insulation, windproof membrane, air gap, panel.

If we say that the load-bearing construction consists of 45x170 mm, how far out can the outer wall extend?

There will probably be a floor structure of at least 45x195 or 45x220 between the basement and the current floor, where I assume this goes all the way to the outer edge of the wall, but does this mean that the studs for the outer walls cannot extend beyond the foundation wall?
 
Ola78
It's probably not a good idea for the load-bearing beams to extend beyond the foundation wall; in such cases, some form of reinforcement under the wall should be made to take up the load and transfer it down to the foundation. The simplest thing is to place them flush with the foundation wall. Here you can look and see: http://www.traguiden.se/TGtemplates/popup2spalt.aspx?id=4553
 
Grr, suspected it would be so. :-(

My question might be modified to something like:

Is it okay for the frame to protrude outside the foundation if the part above the foundation is what is required for strength? (The extra width of the frame is assumed to be only for holding insulation in place.)

The reason for my question is actually that I currently have a wooden structure above the mentioned foundation, if I tear this down and put in a new wooden structure with thicker walls (more insulation), why should I lose indoor space?

Thanks for the link, I will read and consider!

EDIT:
I note that a frame of 45x170 seems to be the maximum likely needed for strength, maybe even down to 45x95 can be OK (living in the Gothenburg area). Can one then assume that it is OK if 70-75 mm of a 45x170 protrudes outside anyway (so that about 95mm stands on the wall/floor), or will other forces and force distributions mess things up?

Anyone have tips on how the foundation can be reinforced so that I can move the wooden structure out and thereby not lose valuable centimeters/decimeters indoors?
 
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Ola78
The way you are thinking of having only the part necessary for just the load should work, but to be safe, contact a structural engineer; other things might be affected if you do it this way. There might be a way, but I don't know if it's feasible, but in multi-family buildings with basement foundation walls and then facade bricks, I believe there is a reinforcement iron, like an angle roughly, screwed into the wall and then the brick on top. It might work for this as well. As mentioned, check with a structural engineer to be on the safe side. Please write how it goes for you; it's always good to know.
 
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