For a typical house with approximately 600mm of loose fill insulation
what measurements are commonly used here, some truss manufacturers call it the eaves height?
it is the measurement from the outside of the wall plate vertically up to the top edge of the rafter...
usually, the loose fill insulation is slightly lower here (it rests against the paper set up to ventilate the attic...)
this concerns both a scissor truss (27-degree roof slope) and a mono-pitch truss (less than 27 degrees) one-story house
Some images can be found here:
http://www.forsgrenstimmerhus.se/UserFiles/PDF/Leveransbesk_LDB2008.pdf
http://www.faluhus.se/UserFiles/dokument/DG.pdf
On the second to last page in both documents
what measurements are commonly used here, some truss manufacturers call it the eaves height?
it is the measurement from the outside of the wall plate vertically up to the top edge of the rafter...
usually, the loose fill insulation is slightly lower here (it rests against the paper set up to ventilate the attic...)
this concerns both a scissor truss (27-degree roof slope) and a mono-pitch truss (less than 27 degrees) one-story house
Some images can be found here:
http://www.forsgrenstimmerhus.se/UserFiles/PDF/Leveransbesk_LDB2008.pdf
http://www.faluhus.se/UserFiles/dokument/DG.pdf
On the second to last page in both documents
I'm afraid I didn't understand what the question was ...
The question was in the title, that is, when ordering a roof truss, you usually specify how high you want it right at the wall plate (it affects the total height of the truss and how high the house wall becomes).
If you make it very low there, there's poor space for insulation just above the wall plate, and if you make it very high there, the wall and the house become unnecessarily high (especially unnecessary for single-story houses).
So between these extremes, you choose something in between, and since almost everyone uses about 500mm loose fill insulation, I'm wondering what is commonly chosen for the measurement.
That is, the c measurement in the following images:
http://www.takstolsfabriken.se/images/tass_1.gif
http://www.takstolsfabriken.se/images/tass_2.gif
http://www.takstolsfabriken.se/images/tass_3.gif
If you make it very low there, there's poor space for insulation just above the wall plate, and if you make it very high there, the wall and the house become unnecessarily high (especially unnecessary for single-story houses).
So between these extremes, you choose something in between, and since almost everyone uses about 500mm loose fill insulation, I'm wondering what is commonly chosen for the measurement.
That is, the c measurement in the following images:
http://www.takstolsfabriken.se/images/tass_1.gif
http://www.takstolsfabriken.se/images/tass_2.gif
http://www.takstolsfabriken.se/images/tass_3.gif
Yes OK.
I don't know what people usually choose.
But that the height should be somewhere between the insulation thickness of the outer wall and the insulation thickness of the attic floor is quite clear.
If the height c is equal to the wall's insulation thickness, it practically means that the walls are "a little higher" and the roof "a little less" in terms of insulation.
I wouldn't overdo this, at least if the house has underfloor heating.
I have the theory that the roof doesn't need to be more than 10% thicker than the walls. At least when you have underfloor heating and the temperature difference between the floor and the ceiling is not so large anymore.
I don't know what people usually choose.
But that the height should be somewhere between the insulation thickness of the outer wall and the insulation thickness of the attic floor is quite clear.
If the height c is equal to the wall's insulation thickness, it practically means that the walls are "a little higher" and the roof "a little less" in terms of insulation.
I wouldn't overdo this, at least if the house has underfloor heating.
I have the theory that the roof doesn't need to be more than 10% thicker than the walls. At least when you have underfloor heating and the temperature difference between the floor and the ceiling is not so large anymore.