This usually occurs when a home has its moisture levels changed. Examples of this:
- A new home, particularly built during winter.
- Change of a heating system.
- New roof.
- New insulation.
Your homes moisture level will change. In a new home moisture levels in timber can change form 18% down to 10%. However, the filler stays the same size. So what was once a flush fill can now be seen as a bulge or crack.
