Staple plate 20 or 30 mm?

Hi everyone,

In another thread, I asked about the installation of a controlled residential ventilation system. It looks like the planned floor construction for the installation of a controlled residential ventilation system is suboptimal in my case.

The plan is:
50 mm insulation
30 mm tack board
70 mm cement screed
10 mm tile/wood flooring
------
Total 160 mm

If this were changed to

70 mm insulation
20 mm tack board
50 mm screed
10 mm tile/wood flooring
------
Total 160 mm

everything would be in the green zone.

Now the question:

What exactly is the purpose of the tack board? Just to hold the pipes in place until the screed is poured? For that, 10 mm would probably be enough.
So why are there 20 and 30 mm tack boards?
What are the advantages and disadvantages between 20 and 30 mm?

Thanks and best regards,

Andreas

Oh, it should be a Helios system installed with the 52 mm high flat/oval ducts.

Insulation, impact sound insulation, and holding the needles in place. The pipe already develops quite a bit of tension (at least with us).

In your variant B, you only get 150 mm!!! As far as I know, the staple plates primarily have to hold the pipe of the underfloor heating (and that is primarily done by the foil) and the plates basically form a watertight basin so that the flow screed does not run somewhere else. The whole thing including the edge insulation strip is more or less glued watertight, since the screed is as thin as water. At the places where you drive the staples in, it still runs into the holes, but that apparently doesn’t cause any further problems... I am not an expert, but I have done this twice and for me that would be the logical explanation. Therefore, just add the missing 10 mm to the screed and that’s fine...

Thank you for the reply.

That would mean that a construction of
50 mm insulation
30 mm tack board

in terms of impact sound insulation and thermal insulation should actually be largely equivalent to
60 mm insulation
20 mm tack board.

Then the advantage of the 30 mm board remains that it can withstand greater forces to hold the somewhat stubborn pipes and that the nails simply hold better, right?

Kind regards,

Andreas

Hi,
oups, Peanuts74 is of course right, calculating is sometimes a matter of luck...

It should say:

Option B

70 mm insulation
20 mm tack board
60 mm screed
10 mm tile/parquet
------
Total 160 mm