Place the tongue and groove boards between the rafters. Without underlayment/insulation

  • Erstellt am 2018-01-08 19:35:34

ISO1101

2018-01-08 19:35:34
  • #1
Dear Sir or Madam,

Brief info about my construction project:
I am new here in the forum and currently renovating/refurbishing my newly acquired house. I am now in the final stages.
The money is pretty much exhausted and unfortunately there is no budget left to cover and redo the roof.
I am very skilled with manual work and have done the complete gutting of the building myself. Completely renewed the electrical, water, and heating systems and insulated the lines according to current standards.

Brief info about my attic:
My house has a pitched attic, which is completely uninsulated and as it was from 1960. You can see the rafters, the battens, and the tiles (see picture).
The roof is rainproof (everything stays dry even during heavy rain), but unfortunately not windproof. In case of snow drifts, snow unfortunately gets through from below the tiles and in summer all the dust comes into the attic. We want to fix this condition. The attic should only serve as storage space (for Christmas decorations, Easter decorations, boxes, and crates...).

The roof tiles are double-fired, glazed, and of good quality. They do not need to be replaced, which is why I am even less willing to have my roof redone.

I find insulation between the rafters too risky. Regarding the issue that the rafters might rot without me noticing in time, I have already read a lot about it and think it would be best not to do that but only sufficiently insulate the uppermost floor ceiling.

By the way, the roof windows, like the rest of the house, are triple-glazed. However, that is not my fault.

My plan:
So I have decided to create a small secondary roof between the rafters. Basically, lay Douglas fir tongue-and-groove boards 21mm thick between the rafters. This only provides minimal insulation but that is not my goal. Wind can still pass through between the tongue-and-groove and the tiles, and the whole roof would still remain breathable without me having to worry about moisture and mold?
I want to largely omit the underlay and vapor barrier foil. I do not want to insulate, just cleanly clad it so that no more snow blows in and no more dust/dirt enters.

In case strong wind pushes snow up under the tiles, or there is still a possibility that rain driven by strong wind "rises" under the tiles and penetrates the attic and runs down. Also, it is sufficiently ventilated and can dry?

Should I be thinking about anything else?

Do you have other ideas that can be implemented on a tight budget? I could pay a maximum of €5000 for the attic. It is not worth more to me.
Please do not write to me about energy-saving regulations etc...

Many thanks and best regards!

Lukas-Michael



 

11ant

2018-01-08 19:54:40
  • #2
The one that then goes up to the tongue and groove (which I would also leave unsealed/breathable). Does this phenomenon equally affect both halves of the roof (in the pictures it looks like an asymmetrically pitched roof)?
 

ISO1101

2018-01-08 20:08:35
  • #3
That was a quick response.

No, the roof is symmetrical. That is probably due to the recording.

I only noticed the phenomenon when there were really strong snow drifts. Basically when it snows from bottom to top as well.
Sounds silly at first, but it's true.

I would also leave the ship lap natural and untreated.
Do you see any concerns here? Or are there smarter inexpensive alternatives?

Thanks and regards
Lukas-Michael
 

Nordlys

2018-01-08 20:35:18
  • #4
I think you can do it that way. Nail tight. If, contrary to expectations, there are any problems, it can be taken out again quickly. Karsten
 

ISO1101

2018-01-09 22:08:08
  • #5
Very good. Then I will start soon to knock the tongue and groove boards in there.

What do you mean by nail tight?

Does the following setup as shown in the picture perhaps make sense?
Thanks for all the help here in the forum! Really great!

Regards
Lukas-Michael
 

Nordlys

2018-01-09 22:35:14
  • #6
That overtaxes me.
 

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