Remove fill material in floor structure and replace with new insulation.

[Bondo]

I am renovating the upper floor of a masonry 1 1/2 story house from 1945. I plan to insulate the entire sloped roof with cellulose boards. I have been considering whether to also open up the floor at the same time and replace the old building debris that is there with cellulose boards instead. What makes me hesitate is the risk of poorer sound insulation between the floors. I consider the sound insulation to be good in the house today.

Currently, the floor structure is as follows from the top:

*Solid pine floor 30 mm
*Debris/building dust on loose boards 80 - 100 mm
*Empty space 100 mm
*Boards for the ceiling of the lower floor
*Plaster with reed.

I would like to replace the debris layer and empty space with 200 mm of cellulose. Possibly keep the loose boards in the middle and place 95 mm cellulose boards on the top and bottom of these. Then, either a new solid pine floor or chipboard and floor gypsum.

I would welcome advice and experiences regarding this.

 

[Jonatan79]

Currently renovating the upstairs of a brick 1 1/2 story house from 1945. Planning to insulate the entire sloped roof with cellulose boards.
I've been pondering whether to also take up the floor at the same time and replace the old construction rubble that's there with cellulose boards instead. What makes me hesitate is the risk of worse sound insulation between floors. I believe the sound insulation in the house is good today.
Currently, the floor structure looks as follows from the top.

*Solid pine floor 30 mm
*Rubble/construction dust on loose boards 80 - 100 mm
*Empty space 100 mm
*Boards for the downstairs ceiling
*Plaster with reeds.

I would like to replace the rubble layer and the empty space with 200 mm of cellulose. Possibly keep the loose boards in the middle and place 95 mm cellulose boards on the upper and lower sides of these.
Then either new solid pine flooring or chipboard and floor gypsum.

I welcome advice and experiences regarding this.

Sounds a bit like overkill. What is the goal? Insulating an intermediate floor doesn't have any effect other than possibly sound dampening, which you already seem to have enough of?

 

[Bondo]

Sounds a bit like an advanced course. What's the goal? Isolating a floor structure doesn't have any effect other than possibly soundproofing, which you already seem to have enough of?

Thanks for the quick response.

I would like to get rid of the material as it would make it easier if there's a need for future interventions in the floor structure since it creates a lot of dust. I'm also considering laying a new pine floor. If I'm going to remove the existing one, I thought I might as well remove the material at the same time. Then there's the fire safety aspect, but I'm not sure how much this is affected since the shaft doesn't burn any more than the wood shavings, of which there are also a few. At the same time, there is a void in the floor structure under the masses that might be good to insulate.

 

[Jonatan79]

Thank you for the quick response.

I would like to get rid of the material as it makes it easier if interventions are needed in the floor structure in the future since it creates a lot of dust. I'm also considering laying a new pine floor. If I remove the existing one, I thought I might as well remove the material at the same time. There is also the aspect of fire safety, although I'm not sure how much this is affected since the shaft doesn't burn more than the wood shavings, of which there is also a little. At the same time, there is an empty space in the floor structure under the masses that might be good to insulate.

Insulation is only necessary if you are not heating the floor above.

 

[Workingclasshero]

Bring in a vacuum truck to suck out the debris.
My buddy had such an operation done.
He said it was totally worth it despite the cost.

/W

 

[Bondo]

Bring in a suction truck to remove the debris.
My friend did such an operation.
He said it was totally worth it despite the cost.

/W

Thanks for the tip.

Do you know how he insulated the joists afterward and what the result was?

 

[Workingclasshero]

Thanks for the tip.

Do you know how he insulated the joists afterwards and what the result was?

Have not delved into it.
Send PM if you want me to ask.
/W

 

[a_w]

There is a risk that you may get worse dynamic properties in the floor if you reduce its mass. For example, vibrations from footsteps or washing machines may increase.

 

[sinuslinus]

You should reduce floor drafts if you insulate along the exterior walls. Settled insulation in the beam framework is usually a major cause of floor drafts in old houses.