Hi!

I am in the planning stage of starting to renovate the old barn. They renovated it in the '80s and used second-hand concrete tiles that are now completely worn out. The barn also lacks an underroof; the tiles are laid directly on battens nailed to the rafters. The battens are the only thing they didn't skimp on, as they are nice 2x3 inches and have withstood the test of time very well.

I am now considering installing a metal roof instead, probably standard tp20. The only problem is that condensation forms under the metal. I would like to keep the nice battens and am therefore wondering if one could place a condensation fabric directly on the battens. The battens are set at 30 cm intervals today. I'm mainly concerned that there could be issues where you screw through the fabric, but maybe it doesn't matter that much? Does anyone have a tip?

Note! I am cheap, answers like "remove the battens" are not accepted ;)

P.S. By the way, I saw that there is roof metal with condensation-absorbing fabric glued on the underside, has anyone tried it?
 
I have tested TP20 with "built-in" condensation fabric in my cold storage (60m2, wooden frame, uninsulated with only metal on walls and roof) and it works excellently, it never drips from the inside of the roof. All condensation is captured by the fabric and then ventilated away.

Furthermore, I think it works well to put any condensation fabric/plastic directly under the metal as well, i.e., on the battens.
 
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Chronaus and 1 other
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Rickard.
The condensation fabric should not touch the metal sheet because then condensation forms under the fabric instead, so there must be air between the sheet and the fabric for it to work well. Condensation-protected metal sheeting seems like a suitable solution if one wants to minimize dripping.
 
For band-covered metal roofs, the metal is laid directly on the fabric/felt and has been done so for many years, works well.
 
Rickard.
G Gabbe1 said:
On band-covered sheet metal roofs, the metal is placed directly on the felt/paper, and this has been done for many years, works well.
Can't compare paper with condense fabric
 
Rickard. Rickard. said:
Can't compare cardboard with condensation fabric
No, you're right about that.
But many band coverings and click roofs are placed directly on thin underlay fabrics that should be comparable to a simple condensation fabric.
 
Rickard.
G Gabbe1 said:
should be comparable to a simple condensation fabric.
No, you cannot compare these, even the thinnest fabrics have 6-7 times more mass and are made of a completely different material.

Of course, I don't know that it will be a problem, but I have seen when condensation fabric is stretched under the sheet metal, and then during certain weather, there have been drops under all profile bottoms.
 
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Gabbe1
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