Hello everyone,
A question from a construction novice... It’s about the ceiling in the bathroom.
First, a general overview of the structure:
Single-family house, shed roof with external thermal insulation and exposed roof trusses, exterior walls made of 40cm (16 inches) aerated concrete (PP2, lambda 0.09), interior walls made of 11.5/20 cm (4.5/8 inches) calcium silicate bricks, no additional insulation on exterior walls, underfloor heating, no mechanical ventilation with heat recovery. The building permit/planning permission has been submitted.
The visible boarding of the shed roof extends beyond the wall plate. The planner’s design intends to seal the transition between the wall plate, rafters, and visible boarding airtight, but without additional thermal insulation. From my layman’s perspective, the continuous wood of the rafters and visible boarding creates a thermal bridge where condensation might occur. Unfortunately, I don’t have scientific evidence to support this, nor a better solution to eliminate this weak point.
My main concern is that the bathroom on the upper floor could possibly have a permanently cold spot at the transition between the wall and exposed boarding during winter. This might lead to a slight mold issue at this damp and cold spot under normal bathroom use by four people. At least, that’s what I fear and communicated this to the planner. The planner is now trying to portray this concern as exaggerated. My request for a better solution was not addressed.
Could one of the experts tell me if this is really a problem, or if I’m worrying unnecessarily? Or is there a way to make such a transition from visible boarding to wall better or differently?
I would appreciate any advice!
ato
A question from a construction novice... It’s about the ceiling in the bathroom.
First, a general overview of the structure:
Single-family house, shed roof with external thermal insulation and exposed roof trusses, exterior walls made of 40cm (16 inches) aerated concrete (PP2, lambda 0.09), interior walls made of 11.5/20 cm (4.5/8 inches) calcium silicate bricks, no additional insulation on exterior walls, underfloor heating, no mechanical ventilation with heat recovery. The building permit/planning permission has been submitted.
The visible boarding of the shed roof extends beyond the wall plate. The planner’s design intends to seal the transition between the wall plate, rafters, and visible boarding airtight, but without additional thermal insulation. From my layman’s perspective, the continuous wood of the rafters and visible boarding creates a thermal bridge where condensation might occur. Unfortunately, I don’t have scientific evidence to support this, nor a better solution to eliminate this weak point.
My main concern is that the bathroom on the upper floor could possibly have a permanently cold spot at the transition between the wall and exposed boarding during winter. This might lead to a slight mold issue at this damp and cold spot under normal bathroom use by four people. At least, that’s what I fear and communicated this to the planner. The planner is now trying to portray this concern as exaggerated. My request for a better solution was not addressed.
Could one of the experts tell me if this is really a problem, or if I’m worrying unnecessarily? Or is there a way to make such a transition from visible boarding to wall better or differently?
I would appreciate any advice!
ato
Is it advisable to install additional insulation beneath the rafters in the bathroom on top of the roof insulation? This way, the visible boarding would be behind an extra layer of insulation, eliminating the problem of thermal bridging and condensation. Or would that cause other issues?
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