ᐅ Gable roof / Insulation up to the ridge or up to/on the intermediate ceiling?
Created on: 21 May 2013 09:22
P
Philiboy83
Hello
The question concerns the insulation of a pitched roof (a one-and-a-half-story single-family house is to be built) with an unheated attic (used not as living space but only as storage). Should the insulation be installed between the rafters all the way up to the ridge, or only up to the top edge of the intermediate ceiling between the attic rooms and the attic space, with insulation then applied to the ceiling?
Or should both be insulated?
According to the builder, all options are possible, and he would choose the first option.
The question concerns the insulation of a pitched roof (a one-and-a-half-story single-family house is to be built) with an unheated attic (used not as living space but only as storage). Should the insulation be installed between the rafters all the way up to the ridge, or only up to the top edge of the intermediate ceiling between the attic rooms and the attic space, with insulation then applied to the ceiling?
Or should both be insulated?
According to the builder, all options are possible, and he would choose the first option.
Bauexperte schrieb:
...I am quite surprised that a TÜV inspector is supposed to have made these statements Likewise! Could this possibly reflect the credibility of a TÜV inspector?
Best regards
B
Bauexperte12 Jun 2013 19:04Hello,
you should actually have reliable information regarding the required execution
Thermal bridges occur wherever the continuous insulation layer (to prevent cold bridges between insulation boards, it makes sense to install the boards in two offset layers) of the ceiling is interrupted or ends. For optimal thermal protection, the insulation of the exterior wall should seamlessly connect to the ceiling insulation. Otherwise, thermal bridges remain, especially in concrete ceilings, at the points where the ceiling rests on the exterior wall.
Regards, Bauexperte
you should actually have reliable information regarding the required execution
HausbauBlog schrieb:Concrete ceilings with typical floor slab thickness are almost vapor- and airtight. Therefore, using a vapor retarder membrane is usually not necessary.
This is how it looks with us: Upper floor ceiling made of precast concrete slabs. Roof hatch installed specifically for a KfW 55 house. The vapor barrier is laid on the ceiling.
HausbauBlog schrieb:20 m² (215 sq ft) of walkable EPS panels? Minimum requirements according to the Energy Saving Ordinance 2009: approximately 14–20 cm (6–8 inches) (U-value of 0.24 W/m²K), recommended thickness is 22–28 cm (9–11 inches).
In the middle of this area (so that the construction company, which has since gone bankrupt, could quickly save some money) about 20 m² (215 sq ft) was covered with expanded polystyrene (EPS) panels. The layers are as follows: 18 cm (7 inches) reinforced concrete slab. One layer of PE foil glued, and on top 24 cm (10 inches) XPS insulation with WLG035. The rest was filled with glass wool at the same height.
Thermal bridges occur wherever the continuous insulation layer (to prevent cold bridges between insulation boards, it makes sense to install the boards in two offset layers) of the ceiling is interrupted or ends. For optimal thermal protection, the insulation of the exterior wall should seamlessly connect to the ceiling insulation. Otherwise, thermal bridges remain, especially in concrete ceilings, at the points where the ceiling rests on the exterior wall.
HausbauBlog schrieb:If there are no other specific requirements in the energy saving ordinance calculation for the building project => KfW 55 <= these measures are generally sufficient.
Now the confusion: Is this sufficient, or is additional rafter insulation still required?
Regards, Bauexperte
HausbauBlog schrieb:
Depending on what you want to store up there, it would be better to extend the insulation all the way to the top. The attic gets cold in winter, and some moisture will develop. Hello!
How exactly does moisture form again? Otherwise, it is of course true that moist warm air can enter the attic through diffusion (though not really in this construction), or through the attic hatch, etc. Since the roof space, whether insulated or not, is cooler than the rest of the house, condensation will occur there.
And it wouldn’t be very wise to leave that area like this. So I either have to insulate and heat – or not insulate and (so to speak, automatically) ventilate! Of course, it’s best to avoid using a vapor barrier. That’s how it was done in our house – although I can’t say what the fabric-like underlay membrane is made of – and it works great.
Summer heat is quickly vented, and all the books and such are perfectly fine.
Regards,
TomTom1
H
Häuslebauerer21 Jun 2013 09:04Hello Philiboy83,
I recently faced the same "problem." I did some research online and came across an article on the topic. I decided to insulate all the way up to the ridge. I can send you the link via private message if you like.
I hope this helps?! Let me know what you decide.
I recently faced the same "problem." I did some research online and came across an article on the topic. I decided to insulate all the way up to the ridge. I can send you the link via private message if you like.
I hope this helps?! Let me know what you decide.
Have you made a decision yet?
We plan to insulate the attic because we will use the space sooner or later anyway.
So we are insulating all the way up to the ridge.
However, if you can rule that out, I would save the money. But once you’re at it, it’s of course easier to insulate it right away. Later on, it is difficult to add insulation, boards, etc. if you decide otherwise.
We plan to insulate the attic because we will use the space sooner or later anyway.
So we are insulating all the way up to the ridge.
However, if you can rule that out, I would save the money. But once you’re at it, it’s of course easier to insulate it right away. Later on, it is difficult to add insulation, boards, etc. if you decide otherwise.
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