ᐅ Wood fiber boards instead of roofing underlayment membranes
Created on: 13 Feb 2017 00:43
K
Kaspatoo
Hello,
We recently visited a building materials supplier, and they recommended wood fiber boards instead of roofing underlayment, without us asking. I’m now trying to find out if they are really as advantageous as described, or if it was mainly a sales pitch.
The wood fiber boards are said to offer the following benefits:
- significantly better roof insulation
- about 7 to 8 hours of heat retention (meaning the sun can shine on the roof for that long before the heat passes through)
- noticeably better soundproofing
The price mentioned was around €15 per square meter (about €7 for materials, €7 for labor).
This would replace roughly €4 per square meter in material costs for the underlayment.
Overall, the extra cost is approximately €2000.
Has anyone here given this some thought or already had experience with this?
We recently visited a building materials supplier, and they recommended wood fiber boards instead of roofing underlayment, without us asking. I’m now trying to find out if they are really as advantageous as described, or if it was mainly a sales pitch.
The wood fiber boards are said to offer the following benefits:
- significantly better roof insulation
- about 7 to 8 hours of heat retention (meaning the sun can shine on the roof for that long before the heat passes through)
- noticeably better soundproofing
The price mentioned was around €15 per square meter (about €7 for materials, €7 for labor).
This would replace roughly €4 per square meter in material costs for the underlayment.
Overall, the extra cost is approximately €2000.
Has anyone here given this some thought or already had experience with this?
C
Che.guevara13 Feb 2017 02:49My energy consultant also recommended this for KfW40.
He said 60 mm (2.4 inches) are commonly used for impact sound insulation, meaning no penetration.
He said 60 mm (2.4 inches) are commonly used for impact sound insulation, meaning no penetration.
We have now been offered wood fiber boards with a thickness of 35mm (1.4 inches), including installation and already deducting the underlayment membranes, for the entire roof (unheated attic, heated top floor) for €3,132.72 gross.
I am not sure if it is worth it. At the moment, I am leaning against it.
I am not sure if it is worth it. At the moment, I am leaning against it.
Kaspatoo schrieb:
Wood fiber boards instead of roofing underlayment membranes"Instead of" is funny – I thought the same at first about mold; unfortunately, jokers sometimes disguise themselves as professional salespeople, not only during carnival.
Kaspatoo schrieb:
- approx. 7-8 hours of heat retention (meaning the sun can shine on the roof for that long before the heat passes through)Exactly: this does not mean they can resist eight hours of direct heat exposure and only let heat through in the ninth hour; rather, they store the heat temporarily and release it with that delay to the surrounding air or other materials, which are by then exposed to different daytime temperatures. Wood and condensation – that’s something you can probably guess without using a lifeline...
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
I don’t think I fully understood your statements. I’m not sure what the wordplay with “anstatt” was supposed to mean—was it a bad pun that I don’t get? ^^
What exactly do you mean by the mold? Unfortunately, I can’t make sense of that statement.
"
… exposed to ambient air under a different daily climate by now, or other materials. Wood and condensation, you can probably guess that without a lifeline ...
"
Are you saying that you also think wood fiber boards tend to develop mold?
I would agree with the previous commenter.
What exactly do you mean by the mold? Unfortunately, I can’t make sense of that statement.
"
… exposed to ambient air under a different daily climate by now, or other materials. Wood and condensation, you can probably guess that without a lifeline ...
"
Are you saying that you also think wood fiber boards tend to develop mold?
I would agree with the previous commenter.
That wasn’t my lame joke, but the building materials supplier’s: underlay membranes are not just wind barriers, but also moisture barriers. If you leave them out and then install something moisture-sensitive instead, this supposed, but actually imperfect “replacement” will pay the price.
The boards themselves are not wrong. But telling you that the membranes can be omitted (“instead of”) is either a complete misunderstanding of physics or deceptive sales tactics bordering on fraud (to make it seem like the additional cost is lower).
You can use the boards, and they probably wouldn’t be chosen for KfW 40 standard if they were just energy placebo products; however, you need to add their cost instead of substituting them. Legally, the seller is on shaky ground, if you ask me.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
The boards themselves are not wrong. But telling you that the membranes can be omitted (“instead of”) is either a complete misunderstanding of physics or deceptive sales tactics bordering on fraud (to make it seem like the additional cost is lower).
You can use the boards, and they probably wouldn’t be chosen for KfW 40 standard if they were just energy placebo products; however, you need to add their cost instead of substituting them. Legally, the seller is on shaky ground, if you ask me.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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