Hello!
I am planning to extend the holiday house by 42 m2 and am now wondering which construction to prefer/different pros and cons. It will be on pillars and I am considering the wall construction from outside-in: 22 mm panel, 22mm battens/air gap cc60, 12mm asphalt board, 45x45 horizontal battens, 45x95 frame timber, tar paper, 13 mm gypsum. My question is actually whether it is preferable to place the 45x45 on the inside and thus be able to have a continuous tar paper, or on the outside where I can "pull down" the insulation on the outside and thus prevent a thermal bridge in the floor. The reason for using tar paper is that I do not want a vapor-tight wall where condensation might occur on plastic due to the fact that it can be colder inside than outside, as I do not have full heating on all the time but only keep it frost-free in winter.
I am planning to extend the holiday house by 42 m2 and am now wondering which construction to prefer/different pros and cons. It will be on pillars and I am considering the wall construction from outside-in: 22 mm panel, 22mm battens/air gap cc60, 12mm asphalt board, 45x45 horizontal battens, 45x95 frame timber, tar paper, 13 mm gypsum. My question is actually whether it is preferable to place the 45x45 on the inside and thus be able to have a continuous tar paper, or on the outside where I can "pull down" the insulation on the outside and thus prevent a thermal bridge in the floor. The reason for using tar paper is that I do not want a vapor-tight wall where condensation might occur on plastic due to the fact that it can be colder inside than outside, as I do not have full heating on all the time but only keep it frost-free in winter.
Why do you want windproof paper (tar paper) on the inside as well?
And on the outside, there is no point if you already have asphalt board there that is tight.
If the asphalt board is not properly installed and tight, you should instead have the windproof paper outside of it. Alternatively, just put windproof paper over the joints of the board.
A simpler method I use is to put Windproof plastic outside the 45x45 boards with insulation between and skip the asphalt board. It's quicker and easier than the somewhat sensitive windproof paper which I find difficult to make really tight. But maybe I'm just generally clumsy
And on the outside, there is no point if you already have asphalt board there that is tight.
If the asphalt board is not properly installed and tight, you should instead have the windproof paper outside of it. Alternatively, just put windproof paper over the joints of the board.
A simpler method I use is to put Windproof plastic outside the 45x45 boards with insulation between and skip the asphalt board. It's quicker and easier than the somewhat sensitive windproof paper which I find difficult to make really tight. But maybe I'm just generally clumsy
The tar paper on the inside is probably intended as some form of vapor barrier, I'm not really sure about its utility, but where I live, the carpenters have traditionally used a construction where there is asphalt board on the outside and tar paper on the inside when it comes to building summer cottages/holiday homes.