Hello,
We are having our saddle roof replaced, where new rough boarding will also be nailed. The attic is considered a cold attic, meaning the insulation is on the floor of the attic.
According to the roofer, who seems knowledgeable, a membrane should be used (in this case Isola D-Projekt). It can be walked on, it doesn't stick, there are fewer seams, it is easier to install, and it lasts longer.
YAP2200 (Isola Isonorm) is the most common asphalt paper on the market, but according to the roofer, it barely meets the requirements, and the membrane should be clearly better.
YEP2500 (Isola Isostark) is a stronger paper that is said to last at least 10 years longer compared to YAP2200, but it is also quite a bit more expensive (4000 SEK for the entire roof).
In general, the membrane is easier to apply, but in this case, we don't have to pay anything extra if we choose asphalt paper.
When we've talked to other sellers, they say we should have asphalt paper on our roof, but the roofer does a lot of roofing work all year round and seems knowledgeable, which makes it difficult for us to choose?
We are having our saddle roof replaced, where new rough boarding will also be nailed. The attic is considered a cold attic, meaning the insulation is on the floor of the attic.
According to the roofer, who seems knowledgeable, a membrane should be used (in this case Isola D-Projekt). It can be walked on, it doesn't stick, there are fewer seams, it is easier to install, and it lasts longer.
YAP2200 (Isola Isonorm) is the most common asphalt paper on the market, but according to the roofer, it barely meets the requirements, and the membrane should be clearly better.
YEP2500 (Isola Isostark) is a stronger paper that is said to last at least 10 years longer compared to YAP2200, but it is also quite a bit more expensive (4000 SEK for the entire roof).
In general, the membrane is easier to apply, but in this case, we don't have to pay anything extra if we choose asphalt paper.
When we've talked to other sellers, they say we should have asphalt paper on our roof, but the roofer does a lot of roofing work all year round and seems knowledgeable, which makes it difficult for us to choose?
Sure, a fabric sounds good but I haven't been able to find any solid information on how long a fabric actually lasts, which might not be surprising considering it's quite new in Sweden. There also seem to be various constructions of fabrics, some even breathe, although that's not the case with the D-project.
Right now we're leaning more towards proven tar paper, it's said that today's tar paper doesn't crumble like it used to.
Why do you think fabric is better?
Right now we're leaning more towards proven tar paper, it's said that today's tar paper doesn't crumble like it used to.
Why do you think fabric is better?
If moisture gets into the roof, the moisture doesn't remain under a tarp, unlike paper where it can stay soaking wet for several weeks before drying.
I think one should look for Dansk duk, as I understand it, they have used tarp much longer than we have in Sweden.
I think one should look for Dansk duk, as I understand it, they have used tarp much longer than we have in Sweden.
But then you must have a diffusion cloth, and it is not recommended by any of the manufacturers for a house that does not have a vapor barrier, i.e., some type of plastic or similar on the inside of the attic towards the living area. However, I don't know why, but otherwise, I also thought it sounded good, especially considering that we already have some moisture up in the attic.
Not all cloth breathes; it might be worth knowing.
Not all cloth breathes; it might be worth knowing.