In Denmark, the problems have been great with magnesium oxide discs. Here is a picture of the Danish Construction Injury Fund.
Wall Panels with magnesium oxide is described by the manufacturer as moisture-resistant alternative to plaster board. But now alerted that the boards can get a gelled when exposed to moisture.
Water Damaged magnesium oxide discs have been discovered in several places in Denmark. In March, issued the Danish Construction Injury Fund, a warning against using them.
– This is an outrage. People have hit and not meant for real. We assume that the disks are greater extent in our house today. It must not be that all the houses hit by injuries, but the risk increases with the said Johan Smeds, building technical expert in the Homeowners’ Association.
After the discoveries in Denmark hired Homeowners’ Association scholar and consultant Olof Mundt-Petersen to make a statement on the discs. Of his report shows that the discs can become a sticky, gelatinous mass that loses in strength when they come in contact with moisture.
Magnesium Oxide Discs there are several different brands on the market. They consist essentially of magnesium oxide, magnesium chloride and the pearlite and usually has an external glass fiber disc which provides its stiffness.
magnesium chloride in the disks appear to be the biggest problem. The subject takes up moisture from the air and can get a consistency that Olof Mundt-Petersen is similar to the semi-liquid salt that is “chewy fudge”.
Additionally, chloride attack and break down the steel, which means that the screws and other fixings liable to rust away.
Manufacturers have indicated that magnesium oxide boards are tested and certified by different agencies. But these tests does not include the study of discs damp-open characteristics, says Mundt-Petersen.
The report concluded that the magnesium oxide discs will not be used in the outer parts of roofs or walls, the bathroom walls, the plaster base, in the garage or basement, or in any environment where it can become wet.
– You can not have moisture sensitive materials, far out in the design. In other studies, I and other researchers discovered that water can penetrate into the body, thus deeper into the building than previously known, says Olof Mundt-Petersen.
Skivorna should not be used as shelters far out of the frame construction.
– If the discs lose their Wind stabilizing function at risk the whole house to collapse as it can not withstand the horizontal forces that occur when the wind blows, says Olof Mundt-Petersen.
How many magnesium oxide discs that are exhibited in the Swedish house is unclear. In Denmark estimates consultancy Bunch Bygningsfysik that between one and two million square meters of discs have been mounted as a windbreak in facades. They are available in at least about 100 buildings and 15 000 homes.
The consultancy recommends that the boards are replaced, which in total is estimated to cost more than billion Danish crowns.
A report from September this year, says Bunch discs emits water for approximately seven days at 90 percent relative humidity and loses its strength over time. In addition, the discs lead to metal parts rust and mold begins to grow.
Two years ago a study was done at Lund University To see how the different types of shelters discs are affected by humidity. Three magnesium oxide discs were examined, but the measurements at high relative humidity had to be stopped for two of them, Honey Core Wind Core and Wekla Green Eco Board, to the boards bent. The study concluded that the magnesium oxide discs had the greatest material movements when exposed to moisture, while the plasterboard had the least movements.
Homeowners’ Association has notified magnesium oxide discs the Board’s market.
No comments:
Post a Comment