Hello.
We are converting an attic into a finished space. We've reached the point where the entire outer shell is finished, and now it's time to level the floor to make it flat, as well as build interior walls and install underfloor heating.
A few questions:
1. On the new leveled joists, should the interior walls be built directly on them, before the underfloor heating/subfloor, or should we first lay out 22 mm chipboard with underfloor heating grooves and then build the interior walls directly on them?
2. If the interior walls are built directly on the joists and then chipboard with heating grooves is laid in each room, wouldn't it be very noisy in that case (5-10 mm gap between the wall and floorboards) since it's "open" under the wall? Should one in that case apply a soft joint between the wall and floor chipboard to avoid sound that way?
3. We don't want it to build up too much, but IF we have to, can we first lay a layer of floor gypsum directly on the joists, then build interior walls and then lay underfloor heating in each room? In that case, how do you get the heating loops past the walls (all should connect into the same manifold/control system)?
Thank you in advance.
//Rickard
We are converting an attic into a finished space. We've reached the point where the entire outer shell is finished, and now it's time to level the floor to make it flat, as well as build interior walls and install underfloor heating.
A few questions:
1. On the new leveled joists, should the interior walls be built directly on them, before the underfloor heating/subfloor, or should we first lay out 22 mm chipboard with underfloor heating grooves and then build the interior walls directly on them?
2. If the interior walls are built directly on the joists and then chipboard with heating grooves is laid in each room, wouldn't it be very noisy in that case (5-10 mm gap between the wall and floorboards) since it's "open" under the wall? Should one in that case apply a soft joint between the wall and floor chipboard to avoid sound that way?
3. We don't want it to build up too much, but IF we have to, can we first lay a layer of floor gypsum directly on the joists, then build interior walls and then lay underfloor heating in each room? In that case, how do you get the heating loops past the walls (all should connect into the same manifold/control system)?
Thank you in advance.
//Rickard
The ceiling height is not affected by the method you use, right? Or have I missed something? You should have the floor thickness that you need for load-bearing, whether the wall studs are on the floor or recessed doesn't matter, does it?
I would lay the entire floor first.
I would lay the entire floor first.
The load-bearing capacity manages fine with only 22 chipboards with heating coils in them, they can be laid directly on the joists according to all manufacturers.
If I lay the entire floor first, with all the coils and so on, then the wall will be placed directly on those chipboards, good/bad? An advantage is that I get all the pipe runs hidden under the wall and don't have to think about how to get the pipes from room to room.
The advantage if I set the wall first is that each room can be handled separately, with the risk of noise transmission since there should be 5-10 mm between walls and floor chipboards.
If we turn it around. In a house with existing partition walls, how do you handle the heating pipes to the floors if they need to go into the next room and so on? Do you drill/saw holes in the wall all the way down by the floor to poke the pipes through?
If I lay the entire floor first, with all the coils and so on, then the wall will be placed directly on those chipboards, good/bad? An advantage is that I get all the pipe runs hidden under the wall and don't have to think about how to get the pipes from room to room.
The advantage if I set the wall first is that each room can be handled separately, with the risk of noise transmission since there should be 5-10 mm between walls and floor chipboards.
If we turn it around. In a house with existing partition walls, how do you handle the heating pipes to the floors if they need to go into the next room and so on? Do you drill/saw holes in the wall all the way down by the floor to poke the pipes through?
1: It is optional, whichever fits best.
2: There should be support under the floor chipboard between the joists, so you need to add noggings there, eliminating the gap. For example, this installation guide, page 8. "Noggings or studs are necessary along all walls." So there should not be a gap, however, when you place the wall on chipboard with grooves, there will be lots of small holes
3: Either you add noggings and place the wall there, or plan a bit more and lay the floor chipboards and then the interior walls.
2: There should be support under the floor chipboard between the joists, so you need to add noggings there, eliminating the gap. For example, this installation guide, page 8. "Noggings or studs are necessary along all walls." So there should not be a gap, however, when you place the wall on chipboard with grooves, there will be lots of small holes
3: Either you add noggings and place the wall there, or plan a bit more and lay the floor chipboards and then the interior walls.
Regarding the underfloor heating, sure, there are feeding plates with extra grooves that can be used to transport hoses. It is also possible to drill holes in the beams for transportation routes and insert a protective hose, through which you can then pull an underfloor heating hose.