I am going to convert half of our garage into a bedroom and it is already insulated, is there anything specific to consider when adding insulation on the inside?
Is it enough to frame and insulate, or do you need any Plastic/Foil layer between the insulation and the sheet material?
This should reasonably be in place today, and by adding another layer, you would likely trap any moisture between the layers, right?
Is it enough to frame and insulate, or do you need any Plastic/Foil layer between the insulation and the sheet material?
This should reasonably be in place today, and by adding another layer, you would likely trap any moisture between the layers, right?
You can check it yourself a little easily..... But it's probably a plastic layer there, yes. Is the garage old?
And just as you write, you trap moisture between the layers if you have 2 layers of plastic... That is NOT GOOD..
And just as you write, you trap moisture between the layers if you have 2 layers of plastic... That is NOT GOOD..
Plastic can only be up to 1/3 inside an insulated wall, so depending on how thickly insulated it is today and how thickly you want to insulate it, the plastic might be able to stay; otherwise, you'll have to remove it and put in new.
it is probably not certain that there is plastic in the wall in the garage as it is often not made to maintain a low temperature there, so the plastic can mess things up in those cases, and there probably isn't much insulation there either, so the plastic is not necessary but best to check before you add more insulation and as mats said the plastic should not be placed further in than 1/3 of the way from the inside of the wall
then some usually claim that if it is under 150mm and others under 120mm insulation, the moisture barrier is not needed as the moisture can migrate when it's that thin, but if it's going to be a room where someone can live, you should aim for 200mm of insulation in the wall and when you check whether there is plastic in the wall also check if there is an air space against the panel since it is not certain that it is in a garage
and what are you going to do with the floor? frame and insulate there because then I would probably put an air gap against the slab before you lay insulation there and ensure it can ventilate out moisture that may come from the slab, but if it is already quite warm there then it would probably be sufficient with regular battens at cc30 and then 95mm studs and insulate between them with a sheet below and wooden floor on top so it should be usable
then some usually claim that if it is under 150mm and others under 120mm insulation, the moisture barrier is not needed as the moisture can migrate when it's that thin, but if it's going to be a room where someone can live, you should aim for 200mm of insulation in the wall and when you check whether there is plastic in the wall also check if there is an air space against the panel since it is not certain that it is in a garage
and what are you going to do with the floor? frame and insulate there because then I would probably put an air gap against the slab before you lay insulation there and ensure it can ventilate out moisture that may come from the slab, but if it is already quite warm there then it would probably be sufficient with regular battens at cc30 and then 95mm studs and insulate between them with a sheet below and wooden floor on top so it should be usable
I know there is an air gap against the panel since the garage is part of the house, as mentioned it's a townhouse and only an outer wall is involved in this case, I plan to keep half of the garage as a storage room and the "sides" of the garage are against interior walls (mine and my neighbor's).
As for the floor, I have a basement underneath so it's not directly on the ground. What I'm most concerned about is really the ceiling; I don't currently know what the construction looks like in terms of insulation and its thickness, but I intend to lower the ceiling and insulate there as well.
As for the floor, I have a basement underneath so it's not directly on the ground. What I'm most concerned about is really the ceiling; I don't currently know what the construction looks like in terms of insulation and its thickness, but I intend to lower the ceiling and insulate there as well.