I'm fully on board with breathable materials on period properties, but I just want to challenge the concept for a moment before I pull the trigger.
Plan is ask for rockwool for ceiling insulation as a part of LBC.
The problem I have is my beams are only 100mm tall, so it's nowhere near the recommended thickness.
I can't go any thicker, as it's all boarded out, with a proper staircase leading to the loft, and I don't want to lose that heritage.
Which got me thinking, would PIR in a ceiling be such a terrible solution?
Humidity inside it consistently below 50%. So I wouldn't expect too high of a vapor gradient.
There is no source of moisture in the other direction so the PIR wouldn''t be trapping water.
The one issue I forsee is if there is a moisture gradient it's going to be forced through the beams where it might condense. Is this the sole reason why PIR should be avoided in ceilings?
If so, could a strip of felt between the beams and PIR not mitigate this issue?
I just want to check that the obvious reasons for avoiding PIR on internal walls, isn;t incorrectly being applied to other parts of the house.
Plan is ask for rockwool for ceiling insulation as a part of LBC.
The problem I have is my beams are only 100mm tall, so it's nowhere near the recommended thickness.
I can't go any thicker, as it's all boarded out, with a proper staircase leading to the loft, and I don't want to lose that heritage.
Which got me thinking, would PIR in a ceiling be such a terrible solution?
Humidity inside it consistently below 50%. So I wouldn't expect too high of a vapor gradient.
There is no source of moisture in the other direction so the PIR wouldn''t be trapping water.
The one issue I forsee is if there is a moisture gradient it's going to be forced through the beams where it might condense. Is this the sole reason why PIR should be avoided in ceilings?
If so, could a strip of felt between the beams and PIR not mitigate this issue?
I just want to check that the obvious reasons for avoiding PIR on internal walls, isn;t incorrectly being applied to other parts of the house.