Underfloor heating upstairs 1930s house

[Mannamandy]

We are in the process of completely renovating the upstairs of our old house. It is of low standard and in great need of modernization. In connection with this, we plan to remove the three section radiators and replace them with waterborne underfloor heating. This will be combined with waterborne radiators on floor 1. The question is how worried should we be about cold drafts? We have 2 windows that are original double-glazed from the 1930s when the house was built. Does anyone have experience with something similar?

 

[Jonatan79]

What type of vents/ventilation do you have on the upper floor?

 

[Mannamandy]

Only natural ventilation. And hardly any fresh air vents at all today. But we'll have to fix that during the renovation.

 

[Jonatan79]

I don't think it will be a big problem when it comes to the upstairs

 

[BirgitS]

When replacing radiators with underfloor heating, you should ensure that the windows are well-sealed and in good condition to avoid drafts.

 

[Björkskär]

The problem with converting to underfloor heating in older houses is that it often requires more power than what the underfloor heating can deliver. You can count on underfloor heating providing about 40W/m2, and in many older houses, much more than that is required. Perform a power requirement calculation before dismantling any radiators. I have been on so many assignments through work where the resident believes there is something wrong with the underfloor heating system, but it is merely a lack of power that is the issue.
/ Björkskär

 

[JanneJanne123]

If the radiators that I guess are under your windows are removed, I believe you will experience condensation on the inside of the windows on cold winter days, given that we are talking about such old windows. I would not remove the radiators, I think they are beautiful in older houses and that underfloor heating feels a little off, but that's my personal opinion and we are all different.

 

[VVS o Energi]

When replacing elements with underfloor heating, you should probably make sure that it is tight around the windows and that the windows are in good condition to avoid drafts.

Simply replace the windows, I would say. Maybe add some insulation on the inside anyway. The original poster mentioned a great need for modernization, and then I think you might as well replace the windows, seal the wall, openings, etc. Insulate between the studs, if it's not already done, and maybe more if possible.