Insulating despite a wet underlayment

  • Erstellt am 2015-01-01 15:13:56

Häuschen15

2015-01-01 15:13:56
  • #1
Hello dear forum members!

This forum is really great and there are many helpful tips. Now we have a special case and can't find anything suitable for our question. Therefore, I am turning to you and hope that someone can help us.

We are building a house and our shell was completed in mid-November. The windows were installed and the roof was covered. We are doing a lot ourselves and have started with the interior work in the last few weeks. We wanted to insulate the roof in the next few days. Our problem now is that the underlay membrane is damp and the beams are partially damp as well. We had very low temperatures in the last days and everything was frozen on the underlay membrane. We set up small heaters and now nothing is frozen anymore but it is still damp. We are not sure at all whether this matters or if it is not bad and will dry out in time. If we clamp the insulation wool between the rafters, no air can get in and we are afraid that it will mold because the vapor barrier on the inside also seals it off.

I hope someone who knows about this topic can help us. If you need any more information, just get in touch.

Many thanks in advance for the help.

Malu
 

schubert79

2015-01-01 15:57:24
  • #2
Please do not insulate when it is wet. You have already made the right considerations regarding mold, etc.
 

Häuschen15

2015-01-01 16:43:36
  • #3
Hello Schubert,
thank you very much for the quick response. Does that mean we should ideally wait until it is completely dry? That can take a while, can't it?
 

Illo77

2015-01-02 08:36:14
  • #4
A small general tip against future moisture on the underside of the [Unterspannbahn], from Denmark there are so-called [Dachfolienlüfter] which are mandatory there in house construction. These are installed in the [Unterspannbahn] and provide ventilation between the [Unterspannbahn] and insulation.

2 customers of mine use these in every house construction after they once had complaints...
 

Similar topics
25.05.2015Extractor hood / roof or wall14
03.03.2015Insulating the roof with kitchen paper/toilet paper12
24.05.2015KfW 55 with wooden house - U-values: Wall 0.18 - Roof 0.1617
05.05.2016Insulate the roof: flakes, panels or wool17
06.09.2016Insulating garage roof, correct sequence of execution61
07.03.2020Children's room on the upper floor open up to the roof25
20.09.2016Extending walls beyond the roof?!43
10.03.2017Roof design / Use of 2nd floor mandatory with 2 full floors23
20.10.2017Roof with photovoltaic or other investment, any experiences?19
12.09.2017Roof constructed too flat - Construction company does not acknowledge the defect12
21.10.2017Sealing the base slab before the roof is installed19
25.07.2019Insulating the attic, avoiding mistakes?22
27.02.2020Is the vapor barrier in the roof vapor-permeable? Yes? No!16
25.10.2020Insulating the concrete ceiling of the upper floor / What to watch out for?17
02.11.2020Is wood fiberboard necessary under the roof?12
19.01.2021Insulate condominium with moldy corners afterward30
23.02.2025Condensate on the underlay membrane11
22.02.2021Stains on underlayment and roof beams10
29.08.2021Attic Expansion - Insulating the Pitched Roof from Inside - Totally Confused13

Oben