I have some questions and concerns regarding moisture issues in our plastered townhouse. It's quite a long story, but hopefully, a kind soul will take the time to read.
We bought a newly built townhouse with move-in in 2009. It's a townhouse with ownership rights, constructed by a major player in the housing market, who in turn hired an external contractor for a turnkey contract. The facade is a plastered facade, with thick plaster on mineral wool with minerit as wind protection board. The house has a balcony, supported by several through wooden beams.
One year after moving in (2010), we discovered damp spots on the wall at the ceiling on the lower floor, after heavy rain. It had rained in via the balcony on the upper floor and ran down along the wall/ceiling junction on the lower floor. Nothing was visible on the floor or wall on the upper floor. Small sections of the wall on the lower floor were opened up, and moisture was measured in beams and drywall, and the moisture found dried up quickly. The contractor discovered holes in the drip plate over the balcony beams. The holes had occurred when the floorboards on the balcony were screwed down. The issue was considered resolved after shorter test spraying.
In June this year, we again got water in during rain, in roughly the same place. Small sections of the wall on the lower floor were reopened to measure moisture. Drywall and studs were obviously moist as it was the day after the rain. The floor and wall on the upper floor were also opened up to thoroughly address the problem this time. They tore, sprayed, investigated, tore, sprayed, investigated... The issue is due to deficiencies in both metalwork and plasterwork at the balcony and window section on the upper floor, and hopefully, they will solve the problem this time as they have been thorough in their troubleshooting. The exact measures needed to fix the issue will be revealed after the holidays, when their investigation is complete.
What I primarily want to ask you about here concerns the restoration of the damage caused during the troubleshooting. They have torn down floors and walls on the upper floor, far enough out that they are now out at the plaster. This means they have removed alignment at the balcony beams, cut and removed a large amount of vapor barrier/plastic between floors, cut minerit boards and outer insulation, and also caused holes in the plaster (holes that from the outside are concealed by the balcony and drip plate). My concern is how we as homeowners ensure that the contractor repairs this in a proper/professional manner? As a layperson, I immediately wonder how you splice minerit boards in a good way from the inside, etc.? Can we demand that an independent party inspects the damage and provides a statement on how the restoration should be done? Can we also require someone to quality assure/document each step in the remediation, as so much cannot be checked once the work is complete?
I am attaching some pictures showing how they have torn down the wall and floor on the upper floor near the balcony.
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