There are more types of fillers than you would think and they serve different functions. Large area and Stable wood: Duraseal Trowelable...

Why do they happen?: Loss of Moisture. Wood accumulates moisture and expands respectively, later it dries and shrinks, creating a gap. ...

Use Case - A radiator was deleted, a wall moved, there is a giant unnecessary vent in the middle of the hallway, or maybe you added on a...