I will probably end up having to tear out a couple of hundred-year-old floor joists, and since the room will be easier to live in if there is a floor, I suppose I will have to venture to replace the old one with a new one. The question is then, the dimensions of the joists will be quite square. Something about 4.90 x 5.30m. How many supports do I need underneath and what dimension of joists should I ideally choose? In the other part of the house, I made a joist frame with 220x45 rafters but I don't think it will be possible to fit that on this side of the house. The ground level would need to be lowered and excavated, and that is not an option. There isn't the strength for that.
Is it possible to use a 195x45 rafter, with a spacing of 60 cm? It can't possibly be worse insulated than what it is today in the old house we have. If I then use such a rafter that is about 5m long, how many supports should I have underneath it? Are two enough, or do I need more than that?
Grateful for opinions.
Is it possible to use a 195x45 rafter, with a spacing of 60 cm? It can't possibly be worse insulated than what it is today in the old house we have. If I then use such a rafter that is about 5m long, how many supports should I have underneath it? Are two enough, or do I need more than that?
Grateful for opinions.
Floor beams of construction timber in one or two spans:
http://www.traguiden.se/TGtemplates/PageTwoColumn.aspx?id=1465
Tips & advice:
http://www.traguiden.se/TGtemplates/PageTwoColumn.aspx?id=5946
Two spans (one support), 45×170, Quality C14, c-c600mm, screw-glued floor chipboard 22mm on top, + possibly noggings or cross bracing...
(lay the beams in the "shorter" direction =4.9m long)
http://www.traguiden.se/TGtemplates/PageTwoColumn.aspx?id=1465
Tips & advice:
http://www.traguiden.se/TGtemplates/PageTwoColumn.aspx?id=5946
Two spans (one support), 45×170, Quality C14, c-c600mm, screw-glued floor chipboard 22mm on top, + possibly noggings or cross bracing...
(lay the beams in the "shorter" direction =4.9m long)
Check if you get any help here:
http://www.traguiden.se/TGtemplates/popup1spalt.aspx?id=679&contextPage=1465
http://www.traguiden.se/TGtemplates/popup1spalt.aspx?id=680&contextPage=1465
Edit: hakaner was faster
http://www.traguiden.se/TGtemplates/popup1spalt.aspx?id=679&contextPage=1465
http://www.traguiden.se/TGtemplates/popup1spalt.aspx?id=680&contextPage=1465
Edit: hakaner was faster
Last edited:
Thank you, however, it stated that it was a requirement to install 22mm particle board, glued, to the joists. I can't use that, instead it will be a plank floor, 25mm thick, directly onto the joists and then you ABSOLUTELY must not glue these boards, they should be screwed at an angle into the joist. Such a floor moves quite a bit depending on the season, etc.
It looks like the minimum is 220x45. Well, I'll see where I can fit it. I guess I'll have to support in a few extra places instead if I have to reduce the dimension.
It looks like the minimum is 220x45. Well, I'll see where I can fit it. I guess I'll have to support in a few extra places instead if I have to reduce the dimension.
Consider that you should look at the table for a compartment if you choose not to have any supports in the room. A bit of discouraging reading, but I would guess these floors will be enormously rigid. Additionally, they hardly account for the fact that the pine floor will interact with the floor joist.
What kind of floor joists do you have today and how far do they span? Is the floor bouncing today?
One option is to install the same dimensions on the floor joists that are there now. Use C24 timber - old timber tends to be good, and you don't want to have lower quality than the original joists. You also don't have to stick to 45mm thick beams. A 70x195 is marginally stronger than a 45x220.
What kind of floor joists do you have today and how far do they span? Is the floor bouncing today?
One option is to install the same dimensions on the floor joists that are there now. Use C24 timber - old timber tends to be good, and you don't want to have lower quality than the original joists. You also don't have to stick to 45mm thick beams. A 70x195 is marginally stronger than a 45x220.