But you forgot the footnote, that it is only approved with hidden fastening.F fribygg said:
But maybe irrelevant.
I have a neighbor whose carpenter installed a similar fabric, and of course with hidden fastening with staples. And the fabric isn't wavy either.
I have not written the instruction.GoC said:
Nor have I linked to it.
I have not even checked that it is the correct instruction as it is not my construction project.
In the linked instruction, it says that it is allowed, and if you or TS have a problem with it, take it up with the manufacturer or seller of the product, I am innocent and wondered early in the thread if it should be nailed.
We were two who simultaneously published the "unclear" instructions from ByggmaxF fribygg said:
If it is now so unclear? The text seems identical to the one Trebolit has on its website
Approved roof = invisible
An approved = nail through both layers.
But enough about that, you are right. The installation is completely correctly executed.
If you check Byggmax's instructions, you will see that it covers five different types of felt, of which 117 is one. When Byggmax edited it a bit, they missed cutting out everything that wasn't for 117. The Danish version below mentions that the other types are approved for nailing through, but 117 is not.
I myself would never have thought to check the Danish instructions, but maybe that’s right since the manufacturer is probably Skånsk.Stefan N said:
If the Montageanvisning isn't in Östgötska, I usually skim through the Swedish or possibly English ones.
Construction veteran
· Norrland
· 342 posts
Hey! You don't need to redo the roofing just because it's a bit bubbly. The underlayment fabric is harder to get smooth than underlayment paper. But if you've double-nailed it, technically you should redo it to meet standards, but there are degrees to everything. In the picture where you laid a round of underlayment paper, you haven't double-nailed that sheet. Can't you just redo the first three sheets with regular paper or underlayment fabric and loosen the seam between fabric and paper so you don't have to redo everything? And if you want to lay new paper over the whole thing, you don't need to remove the first fabric you laid 
Thanks, that sounds like a good idea. Bought new roofing felt, YAP2200. According to these instructions, it can be nailed either hidden or through both layers. Which is preferable?S Snickarkirre said:Hi! You don't need to redo the felt just because it's a bit bubbly. The underlay fabric is harder to get smooth than the underlay felt. But since you've double-nailed it, you might technically need to redo it if following the standards, but there are degrees to everything. In the picture where you've laid a layer of underlay felt, you haven't double-nailed that strip. Can't you just redo the first three strips with regular felt or underlay fabric and loosen the seam between the fabric and felt, so you don't have to redo everything? And if you want to lay new felt over the whole thing, you don't need to remove the first fabric you laid
The only advantage of nailing through both is that you can wait with the battens or the outer roof. There are advantages, for example, if you are going to have shingles or surface felt and there will be a delay, or perhaps you have to wait for someone else to do it.T Ejmelie said:
Now, the underlay felt won't make it stormproof but significantly more wind-resistant than with concealed fixing.
Last edited:
If I think for myself?Krille-72 said:
I'm not talking about aesthetics. I'm asking because I see advantages with both installations. But asking because I know there are those who know better than me what is most suitable.