I would need some good advice. I have a gigantic house and a 10-year project ahead of me. Taking it room by room.
The house was built in 1936, and the wall consists of from the outside in: vertical cladding, 70-80mm vertical planks, wind paper, tretex. Insulation is virtually nonexistent. I've stripped down to the planks in two rooms.
In step one, I plan to add Hunton wood fiber insulation, 45mm. The question is whether to put the vapor barrier (Hunton SD10) directly behind the gypsum, or what I'm leaning towards; directly on the plank wall with 45mm insulation on top?
Right/wrong, advantages/disadvantages?
(I plan to add extra insulation on the outside "sometime", like 2x crossed 45mm more, a windboard on that, and then paneling, but that will be later...)
The house was built in 1936, and the wall consists of from the outside in: vertical cladding, 70-80mm vertical planks, wind paper, tretex. Insulation is virtually nonexistent. I've stripped down to the planks in two rooms.
In step one, I plan to add Hunton wood fiber insulation, 45mm. The question is whether to put the vapor barrier (Hunton SD10) directly behind the gypsum, or what I'm leaning towards; directly on the plank wall with 45mm insulation on top?
Right/wrong, advantages/disadvantages?
(I plan to add extra insulation on the outside "sometime", like 2x crossed 45mm more, a windboard on that, and then paneling, but that will be later...)
Here is my theory:
Place the vapor retarder directly against the plank wall if you want to create an installation layer where you can run electrics and other installations without risking perforating the vapor retarder. A practical approach that gives you flexibility during installations. To avoid condensation problems before you add exterior insulation, ensure that the existing wind barrier or weather protection is in good condition and prevents cold air from penetrating the wall. If cold air enters and cools down the plank wall, warm and humid indoor air can condense at the vapor retarder.
A good choice with a vapor retarder (like Hunton SD10) rather than a vapor barrier, as it reduces the risk of moisture problems because the vapor retarder allows some moisture migration and the wall can "breathe." When you add external insulation in the future with crossed layers and proper weather protection, the plank wall will become warmer and the condensation risk will significantly decrease, while the entire wall receives better insulation and protection against weather impact.
Are you planning to have some type of controlled ventilation? You cannot rely on the natural draft principle after such measures.
Place the vapor retarder directly against the plank wall if you want to create an installation layer where you can run electrics and other installations without risking perforating the vapor retarder. A practical approach that gives you flexibility during installations. To avoid condensation problems before you add exterior insulation, ensure that the existing wind barrier or weather protection is in good condition and prevents cold air from penetrating the wall. If cold air enters and cools down the plank wall, warm and humid indoor air can condense at the vapor retarder.
A good choice with a vapor retarder (like Hunton SD10) rather than a vapor barrier, as it reduces the risk of moisture problems because the vapor retarder allows some moisture migration and the wall can "breathe." When you add external insulation in the future with crossed layers and proper weather protection, the plank wall will become warmer and the condensation risk will significantly decrease, while the entire wall receives better insulation and protection against weather impact.
Are you planning to have some type of controlled ventilation? You cannot rely on the natural draft principle after such measures.