From what I have read seems new builds need such boxes sealing for against fire/smoke spreading.
On my existing 1980s house it was originally all metal boxes but have had some dry lining plastic boxes added over the years.
The original metal boxes could not be said to be air tight due to so many wires coming in to the light switch boxes , as the original builders/electricians used them as the junction box; and also notice some unused knockouts simply missing and fully exposing the void in the stud walls.
With the dry lining boxes, well so many large openings, but no sealer or grommets were used on them.
While think such sealing would not be a requirement to old existing installations, I would like to seal them while replacing the fittings, for my own peice of mind and safety, but unsure what is the correct / easiest material to use to retro seal all these gaps ?
Seen other web comments about just using plaster on new walls or an acrylic sealer on existing boxes, as simple as that ... ??
On my existing 1980s house it was originally all metal boxes but have had some dry lining plastic boxes added over the years.
The original metal boxes could not be said to be air tight due to so many wires coming in to the light switch boxes , as the original builders/electricians used them as the junction box; and also notice some unused knockouts simply missing and fully exposing the void in the stud walls.
With the dry lining boxes, well so many large openings, but no sealer or grommets were used on them.
While think such sealing would not be a requirement to old existing installations, I would like to seal them while replacing the fittings, for my own peice of mind and safety, but unsure what is the correct / easiest material to use to retro seal all these gaps ?
Seen other web comments about just using plaster on new walls or an acrylic sealer on existing boxes, as simple as that ... ??