Roof structure or roof insulation

Hello everyone,

I am having a house (E70 energy-saving house) built with a simple gable roof without windows.

I am doing the roof construction myself. I will receive the roof truss and am then responsible for the rest.

I have not done this myself before, but some relatives have already done it themselves.

Since I am not entirely sure about the roof construction yet, I could still use some advice.

The roofers from the company tell me to do it like this: underlay membranes, counter battens, then the roof battens, and then the tiles... later the insulation between the rafters.
So no boarding made of planks or panels. My question whether this is sufficient for an E70 house was answered with YES.

However, I am considering doing boarding and possibly an over-rafter insulation. That seems more reasonable to me.

Or at least boarding made of DWD or MDF panels, then the underlay membrane, then the counter battens and the roof battens.

Are there any experience reports or expert opinions on this?

Hello,

Underlay membranes, counter battens, then the roof battens and then the tiles on top... later the insulation between the rafters.

That can basically be done that way.

So no boarding made of planks or panels. My question whether that is sufficient for an E70 house was answered with YES.

Who answered this question with YES? The roofer? Your planner?

How thick are your rafters? 20cm? 24cm?

Regards

thank you for the answer...

the question was answered with YES by the builder (Town & Country partner)...

I don't know how thick the rafters are, as the roof structure is not there yet...

but I think they are not over 20cm... because of the higher costs for the builder

Hello,

...The roofers from the company tell me I should do it this way: .....
But I am considering doing it with boarding and possibly insulation above the rafters. That seems more reasonable to me.

I don’t really understand the question :confused:
There is an energy saving ordinance certificate for the construction project! So the structure for the component "roof" should be defined. Just have a look at the documents ;)
Better is always possible, but it must be done properly.
For the rafters, it is about the "height" in the insulation layer, not the "thickness." In today’s construction projects, the height is determined less by the statics and more by the transmission heat losses (insulation between the rafters)! The costs for the roof can also be optimized.

Hopefully, the heating dimensioning is not as aimless.

Best regards.

what do you mean by clueless?

I did write how it is stated in the documents...

==> The roofers from the company tell me to do it like this: underlay membranes, counter-battens and then the roof battens and then the tiles on top... later the insulation between the rafters.

I'm still considering making a sheathing out of DWD boards...

the second consideration is the above-rafter insulation and to do without the insulation between the rafters for that...

Hello,
you can achieve a good insulation value in many ways. With insulation between the rafters and with pure insulation above the rafters. However, the insulation above the rafters is more expensive. And if you have never done something like this yourself, I would think twice about it.

The dimensioning of the beams (beam height) and the properties of your insulation (thermal conductivity group) are important.

How is it calculated in your structural analysis or in the [Wärmeschutznachweis]?

Regards