I have a 2-story house built around 1925. On the upper floor, about 75% of the ceiling area is old tongue and groove planks painted by the previous owner. Looks nice, absolutely. Above it, there is (barely) tar paper and sawdust between the beams. So, almost no insulation up to the attic. How do I make this more efficient? That is, keep the heat in during winter and keep it out during summer without suffocating the house?
I'm thinking of removing all the sawdust and tar paper and adding proper insulation. But what should I have between the insulation and the tongue and groove? Plastic sheeting doesn't seem like the best option? Is there some natural fabric that allows the house to still breathe? It should be noted that the windows will be replaced with triple-glazed with ventilation. But the upper floor is almost uninhabitable during these days.
After this, I plan to install a LVP, partly to provide some heat and also to get some AC in the summer. We have district heating, so it's anything but cheap during the winters.
I can upload pictures to show what it looks like if needed.
I'm thinking of removing all the sawdust and tar paper and adding proper insulation. But what should I have between the insulation and the tongue and groove? Plastic sheeting doesn't seem like the best option? Is there some natural fabric that allows the house to still breathe? It should be noted that the windows will be replaced with triple-glazed with ventilation. But the upper floor is almost uninhabitable during these days.
After this, I plan to install a LVP, partly to provide some heat and also to get some AC in the summer. We have district heating, so it's anything but cheap during the winters.
I can upload pictures to show what it looks like if needed.
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There's no reason to remove the sawdust. Just insulate on top. Check with a company that comes and sprays mineral wool or eco fiber, it's often about the same cost as buying the material yourself. 300-500mm is appropriate.
That can of course be a problem. If it's not possible to seal from below, there's nothing else to do but vacuum the attic.MalZon said:
Then new tar paper/membrane and insulation.
It can be difficult to lay plastic properly with beams and such in the way.
One can say that there are two types of cardboard from a diffusion point of view (how easily water vapor can pass) either open, like most common windproofing on the market. Or vapor brake, which is a middle ground between open and plastic. Even though the theory suggests you should use the type vapor brake, both will work. At least if you insulate less than 400mm.
Which type of cardboard also depends on the structure. Are there beams you will place them in between? Sawn or old logs? Two open types that work. https://www.byggmax.se/vindpapp-ac-...8QIVBKOyCh1pZwUGEAQYASABEgLMFvD_BwE#267=33522 https://www.byggmax.se/vindskydd-bi...8QIVBKOyCh1pZwUGEAQYAiABEgKZHvD_BwE#973=46434
And a vapor brake https://www.byggmax.se/ångbroms-bis...8QIVgrmyCh2L-w_OEAQYASABEgJgsfD_BwE#973=46438
Ok. I recognize the second of the open types. It was probably something similar I covered the garage with.larsbj said:
But if I scoop away all the paper and sawdust, lay fabric and insulation on top of it. Then have you made a good solution?
There are beams across the entire inner ceiling, I think they are sawn but you can see log-like profiles on them. I haven't examined everything that closely yet. There are some planks in the middle that you can walk on and where we have thrown up some obstructing boxes and such.