Counter battens in the interior area for roof insulation

Hello,

so you mean that I should leave out the insulation between the vapor barrier and the GK boards?

And, if I understand correctly, the battens should run in the rafter direction???

I would now rather not take all the battens down again.

Attaching the battens additionally to the rafters would still be an alternative.

The pictures are now finished.

Here again the arrangement of the slats before:


and here after, I also renewed the inside of the dormers:

so you mean that I should leave out the insulation between the vapor barrier and the drywall panels?

I wouldn’t recommend it, because in solid construction the moisture content is elevated in the first few years. Due to the unfavorable sd-values, I wouldn’t completely rule out mold formation. The sound insulation also doesn’t bring much, as the insulation between the rafters is probably already sagging. Here you can possibly achieve more through the surface.

And, if I understand correctly, the battens should be in the direction of the rafters???

The battens are called counter battens because they counter the membrane. As it is countered now, the membrane is only held at points, but the correct way is along the length, so it does not bend as much and is less stressed by wind.

Best regards

I would not recommend it, as the moisture content is increased in the first years with solid construction.

That's true, in this respect a timber frame house is significantly more advantageous ...

Due to the unfavorable sd-values, I would not exclude mold growth 100%.

I too would not exclude mold growth in the house 100%, however not necessarily for reasons of installing the insulation under the rafters ...

The sound insulation does not bring much either, ..... Here you can possibly achieve more on the surface.

Cavity damping and sound-absorbing materials arranged on the room side of the cladding layer are certainly two different things ...

While the insulation under the rafters counteracts a resonance-related amplifying effect of the cavity, the absorber layer on the room side reduces the (amplified) reverberation in the living space ...

In any case, I find it better to counteract the formation of an increase in sound than to fight the increased sound levels ...

... because certainly the insulation between the rafters is already sagging ...

With the clear spacing of the substructure of about 25 cm, this is hardly to be feared ...

The battens are called counter battens because the foil is countered with them.

Well then, I spontaneously ask to be allowed to use this saying in other forums as well (of course with source reference)!

(In interior finishing, however, one rather speaks of base and support battens, possibly also in a broader context of pressing battens when it comes to the mechanical tensile safety of adhesive joints.)

As it is now countered, the foil is only held at points, but it should be held along the length ...

That should also be corrected!

so that it does not bend through so much

This statement can hardly be maintained either.


With kind regards from Erfurt
KPS

Happy New Year everyone.

Between the roof tiles and the rafters, there is still an underlay membrane.

On the topic of counter battens:

Just based on feeling, I would say that "my" battens with a 300 mm spacing relieve more tension from the membrane than battens on the rafters (with 600 mm spacing), especially since the insulation wool would sag along the entire length, as mentioned in the previous post, thus putting more tensile forces on the adhesive joints.

I will continue the battens as already finished in 2 rooms.

Regarding filling the gap (drywall boards and vapor barrier), there are now 2 opinions with respective advantages and disadvantages.

Could it happen that condensation forms on the membrane if no insulation is installed? (caused by the cooler surface of the membrane compared to the room air temperature.)

Or does the membrane used not allow this at all and would rather be impaired in its function by built-in insulation?

Between the roof tiles and the rafter beam, there is still an underlay membrane.

I already thought so, however, the specification of the Sd value of the underlay or sub-roof membrane would also be of interest here ...

Just based on feeling, I would say that "my" battens with a 300 mm spacing of the foil relieve tension more than battens on the rafters (with 600 mm spacing) ...

I see it the same way!

Could it happen that condensation forms on the foil ... ?

But yes, whether with or without insulation below the rafters ...

To prevent the growth of mold cultures, all favorable conditions and factors must always be taken into account!


KPS