Even though we’ve been soaked in some unseasonal sunshine lately, the mornings have still been a little, well, crisp. For that matter, so have the afternoons and evenings.
As lovely as this is, there is a downside for floor sanding contractors, other than the increased urge to stop working and go to the beach;- the false sense of security. Timber does not retain cold temperatures like, say, concrete. But the irony here is that timber is, mostly, laid over concrete, or over mid air in the case of solid on joists and bearers. So it gets gold. Damn cold. And most timber floor coatings react adversley to cold.
Solvent based polys lose their viscosity and can leave lap marks. Water based/ Alkalyd coatings can crystallise and form crows feet.
We’ve harped on before about the importance of warming the place up before you coat. The problem is, ambient room temperature is not the issue. The issue is the temperature of the floor itself.
Take precautions which are over and above the minimum, such as have heating running over night before you coat. Heat up the tubs, especially waterbased, in a laundry trough for half and hour prior to coating.
There is no standard on correct floor temperature prior to coating, so we can’t say “don’t coat if it’s below X degrees”, as if that would offer any warranty against any problem. One trick is to take your shoes and socks off, walk on the floor in bare feet. If you instantly say “Dang, that’s cold…”, then it’s probably too cold to coat.