When defects develop on a hand scraped wood floors, the result can be ugly and the repair difficult. Doors tend to develop when the floorboards shrink under dry conditions and will be more pronounced if moisture from the subfloor has caused them to swell first. Spot repairs with floor filler are possible if gapping is not too extensive, but once it has gone all over the floor, you usually have to refinish the floor.
Causes of Gaps
Hand scraped floors boards absorb moisture from the air and subfloor and expand when available, and lose this moisture and shrink under dry conditions. As the floorboards expand, they can shoot against each other; when they shrink again, gaps can be formed. In many cases, these deficiencies are normal and need not be completed. When extreme, it may be due to moisture in the subfloor or extreme humidity or dryness in the room. Doors can also be formed when floorboards work loose from the ground and either move towards each other or pop up.
Types of Filler
While all types of wood floors filler will seal gaps between the boards, those that last are either epoxy, lacquer or latex based. Epoxy based resins dry harder than wood and has sufficiently strong adhesion properties to bond to the boards and prevent gaps from widening. Epoxy and lacquer fillers have a plastic appearance and look best with the pre-treated boards. Latex flooring is still flexible enough to move with the floorboards and accepts bets, but it is not strong enough to prevent the boards from moving. It comes chip and fall out of a gap if the wood moves and the size of the gap changes.