We are planning to open up 1/3 of the upstairs to the ridge in our house from 1860. The area will be about 35 sqm. One consideration is whether it's possible to expose the longitudinal beams, or if there will be too little insulation or ventilation gap. You want to avoid mold!
I was thinking of installing vertical tongue and groove boards in various widths to add some life to the ceiling between the beams. Then all other walls will have horizontal white paneling.
Is it enough to place wind barrier against the existing ceiling, or do we need plastic? It feels impossible to make such an old house airtight anyway.
A few other thoughts that come up are the choice of insulation, is it possible to use gullfiber? Should one seal with plastic against the ceiling or refrain? Are the gaps between the vertical planks enough as an air gap if tar paper is applied directly over them?
Would it work from the outside with tar paper/insulation/ceiling.
