I plan to wire my house with CAT6 cables, running inside the walls (drywall, wood). I would have to drill through the floor and probably through fire blocks in between the studs.
Lot of guides advise to pull a string in addition to the cables, so that additional wires could be easily pulled later. I do want to do that, mostly for upgradability later on
However one guide mentioned to fill the fireblock/floor hole with fire retardant sealant.
If I fill with the sealant, there is no way I could pull anything else through it. So the question is: is it really necessary to fill these holes with fire retardant sealant, or is it safe to leave them as is?
If it matters, I am in Ontario, Canada.