ᐅ Roof insulation made of 100mm thick rigid polyurethane (PU) foam
Created on: 21 Oct 2019 09:19
A
Ankeffm
Hello everyone,
I urgently need some advice and tips regarding roof insulation.
We plan to have our roof replaced next year. Now, the topic is roof insulation. Our roofer recommended the following:
Polyurethane (PU) rigid foam, 100mm (4 inches) thick // Type: puren Protect N 023.
This would be an insulation installed above the rafters (i.e., external insulation). However, I have read in forums and other sources that sound insulation with this type of material often falls short. The noise level can sometimes be quite high. This is partly due to the boards themselves (as they apparently expand and contract, especially at night) and also because the boards do not provide good soundproofing.
We would really like the space under the roof to be more comfortable in summer and, of course, quieter—or at least that outside noise levels are bearable.
Can you give us advice on the best way to insulate a roof like this? Has anyone had experience with this type: puren Protect N 023?
Please help... THANK YOU!!!
Best regards, Anke
I urgently need some advice and tips regarding roof insulation.
We plan to have our roof replaced next year. Now, the topic is roof insulation. Our roofer recommended the following:
Polyurethane (PU) rigid foam, 100mm (4 inches) thick // Type: puren Protect N 023.
This would be an insulation installed above the rafters (i.e., external insulation). However, I have read in forums and other sources that sound insulation with this type of material often falls short. The noise level can sometimes be quite high. This is partly due to the boards themselves (as they apparently expand and contract, especially at night) and also because the boards do not provide good soundproofing.
We would really like the space under the roof to be more comfortable in summer and, of course, quieter—or at least that outside noise levels are bearable.
Can you give us advice on the best way to insulate a roof like this? Has anyone had experience with this type: puren Protect N 023?
Please help... THANK YOU!!!
Best regards, Anke
Then everything must be done, including the insulation between the rafters. If done yourself, it costs around 1200–1500 euros.
The work is manageable for non-professionals, but not entirely easy. Sealing the membrane can be a bit tricky. It needs to be airtight. Instead of a standard vapor barrier, we installed a climate membrane that allows air to pass when warm and closes up when cold. The idea is that any moisture that may have entered the glass wool can dry out when it's warm.
Does it work? We choose to believe so. Our insulation project was completed in two intense days of about 10 hours each, working as a team of two.
Material used: 100 sqm (1076 sq ft) of insulation wool, 100 sqm (1076 sq ft) of membrane, four rolls of sealing tape like Sigacrall, 240 m (787 ft) of formwork boards, 25 m (82 ft) of roof battens, three boxes of screws, and four cartridges of membrane adhesive. Just to give an idea.
The work is manageable for non-professionals, but not entirely easy. Sealing the membrane can be a bit tricky. It needs to be airtight. Instead of a standard vapor barrier, we installed a climate membrane that allows air to pass when warm and closes up when cold. The idea is that any moisture that may have entered the glass wool can dry out when it's warm.
Does it work? We choose to believe so. Our insulation project was completed in two intense days of about 10 hours each, working as a team of two.
Material used: 100 sqm (1076 sq ft) of insulation wool, 100 sqm (1076 sq ft) of membrane, four rolls of sealing tape like Sigacrall, 240 m (787 ft) of formwork boards, 25 m (82 ft) of roof battens, three boxes of screws, and four cartridges of membrane adhesive. Just to give an idea.
In my opinion, roof insulation isn’t as complicated as it’s often made out to be.
Thermal insulation is achieved with an insulating layer, whether it’s above, between, or below the rafters doesn’t matter much.
For existing buildings, a U-value of 0.24 is common and easy to achieve.
Soundproofing and a decent time lag (which also provides heat protection) can only be achieved through mass.
If the interior space allows, for example, double OSB + double plasterboard or clay panels—the heavier the better.
What are the roofers asking for the insulation above the rafters?
As mentioned here several times, insulation between the rafters is relatively simple and also cost-effective to install yourself. Of course, careful work is necessary when sealing the vapor barrier, but without time pressure, it’s not rocket science.
Thermal insulation is achieved with an insulating layer, whether it’s above, between, or below the rafters doesn’t matter much.
For existing buildings, a U-value of 0.24 is common and easy to achieve.
Soundproofing and a decent time lag (which also provides heat protection) can only be achieved through mass.
If the interior space allows, for example, double OSB + double plasterboard or clay panels—the heavier the better.
What are the roofers asking for the insulation above the rafters?
As mentioned here several times, insulation between the rafters is relatively simple and also cost-effective to install yourself. Of course, careful work is necessary when sealing the vapor barrier, but without time pressure, it’s not rocket science.
Wow, wow, wow.
It’s really frustrating how it’s already taken for granted that, for example, roofing companies have little knowledge about insulation, heat protection, or soundproofing, and end up recommending something to the customer that turns out to be completely inadequate.
The proposed solution is to involve an architect who then gives concrete instructions to the roofer, who carries out the work according to those instructions?
Well then, why hire a specialist company at all? At that point, you might as well hire the supposedly “bad” and “foreign” tradespeople. (For the sensitive ones: nobody is bad, and foreign workers do great work too!)
And everyone just has money lying around to suddenly afford an architect because the tradespeople don’t know their field... That’s really unfortunate. Truly unfortunate.
I will soon have my roof redone, so heat and thermal protection will also be a relevant issue for me. But after reading what’s been said here, I’ll probably do it myself again or hire tradespeople from platforms like “MyHammer.”
It’s really frustrating how it’s already taken for granted that, for example, roofing companies have little knowledge about insulation, heat protection, or soundproofing, and end up recommending something to the customer that turns out to be completely inadequate.
The proposed solution is to involve an architect who then gives concrete instructions to the roofer, who carries out the work according to those instructions?
Well then, why hire a specialist company at all? At that point, you might as well hire the supposedly “bad” and “foreign” tradespeople. (For the sensitive ones: nobody is bad, and foreign workers do great work too!)
And everyone just has money lying around to suddenly afford an architect because the tradespeople don’t know their field... That’s really unfortunate. Truly unfortunate.
I will soon have my roof redone, so heat and thermal protection will also be a relevant issue for me. But after reading what’s been said here, I’ll probably do it myself again or hire tradespeople from platforms like “MyHammer.”
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