ᐅ Insulation panel 20 mm or 30 mm thickness?

Hi everyone,

In another thread, I asked about installing a mechanical ventilation system with heat recovery. It looks like the planned floor construction for my project may not be ideal for installing such a system.

The current plan is:
50 mm (2 inches) insulation
30 mm (1.2 inches) staple board
70 mm (2.8 inches) cement screed
10 mm (0.4 inches) tile/parquet flooring
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Total 160 mm (6.3 inches)

If it were changed to:

70 mm (2.8 inches) insulation
20 mm (0.8 inches) staple board
50 mm (2 inches) screed
10 mm (0.4 inches) tile/parquet flooring
------
Total 160 mm (6.3 inches)

everything would be fine.

Now my question:

What is the exact purpose of the staple board? Is it just to hold the pipes in place until the screed is poured? For that, wouldn’t about 10 mm (0.4 inches) be sufficient?
Why are there 20 mm (0.8 inches) and 30 mm (1.2 inches) staple boards available?
What are the advantages and disadvantages between 20 mm and 30 mm thickness?

Thanks and best regards,

Andreas

Oh, a Helios system with 52mm (2 inches) high flat/oval ducts is going to be installed.

Insulation, impact sound insulation, and securing the needles. The pipe already builds up quite a bit of tension (at least in our case).

In your option B, you only reach 150 mm (6 inches)!!!

As far as I know, the fixing plates primarily serve to hold the underfloor heating pipes in place (which is mainly done by the membrane), and the plates essentially create a waterproof basin so that the flow screed doesn’t leak anywhere. The whole system, including the edge insulation strip, is more or less sealed to be waterproof, since the screed is as fluid as water.

At the points where you push in the staples, the screed will still flow into the holes, but that apparently doesn’t cause any issues...

I’m not a professional, but I have done this twice and for me, this seems like the logical explanation. So go ahead and add the missing 10 mm (0.4 inches) to the screed thickness, and that should be fine...

Thank you for the response.

This would mean that installing
50 mm (2 inches) insulation
30 mm (1¼ inches) staple board

in terms of impact sound insulation and thermal insulation should essentially be equivalent to
60 mm (2⅜ inches) insulation
20 mm (¾ inch) staple board.

Then the advantage of the 30 mm (1¼ inch) board is that it can better resist the forces needed to hold the somewhat stiff pipes in place and also that the nails simply hold better, correct?

Best regards,

Andreas

Hi,
oops, Peanuts74 is of course right, calculations can sometimes be a matter of luck...

It should read:

Option B

70 mm (3 inches) insulation
20 mm (0.8 inches) fixing panel
60 mm (2.4 inches) screed
10 mm (0.4 inches) tile/parquet
------
Total 160 mm (6.3 inches)