A common house foundation is insulated from the underside, and I think you need to do the same here and make sure there's no moisture left before covering the top side.
Moisture rises upwards, doesn't it? I've never encountered this issue and would love to hear what someone more knowledgeable than me has to say on the subject. Interesting!
Johan
Moisture rises upwards, doesn't it? I've never encountered this issue and would love to hear what someone more knowledgeable than me has to say on the subject. Interesting!
Johan
The edge of the concrete roof where it meets the wall will become a thermal bridge if you insulate underneath. I would have placed the new construction on top of the existing one, that way you can get all the insulation to meet properly without creating condensation sites inside the structure.
Wodda. Can you elaborate? I don't quite understand what you mean. Pour a new insulated slab on top of the existing roof? If you put insulation under the current one all the way to the wall, and the new wall on top a bit inside, doesn't it become similar to a regular house foundation?
How will he get insulation under his feet?
Johan
How will he get insulation under his feet?
Johan
Thank you for your feedback, a special situation that no one has really experienced. Maybe one can insulate around with insulation outside the concrete to remove the thermal bridge. I do not want to raise too much as it would mean having to arrange an air gap and a new "base plate" above the existing one.
eldhed.
I have run out of ideas, but I follow the topic with curiosity.
Johan
I have run out of ideas, but I follow the topic with curiosity.
Johan
I have now thought through the construction. I plan to build with Besta blocks on the existing uninsulated concrete roof.
I have decided to insulate the underside of the roof with a perimeter around it to avoid thermal bridging.
A new question arises, should I completely omit insulation on the top side or should I insulate with e.g. 90 mm between the floor joists?
I have decided to insulate the underside of the roof with a perimeter around it to avoid thermal bridging.
A new question arises, should I completely omit insulation on the top side or should I insulate with e.g. 90 mm between the floor joists?