Attic tank issue

It depends on how far the Insulation has gone into the pipe. It could be as simple as removing a pipe fitting and removing the blockage. It could also involve replacing large sections of the pipe. Blocking could be in the attic but it could be in a wall or under the bathroom floor.

Edit: I'd contact the Insulation company first. They might send out their own plumber

Oh this could be a nightmare.
Had to deal with a similar situation and it was a pain in the proverbial sorting it out.
Tap spouts had small particles blocking them.
Toilet cistern fillers were blocked.
And there were particles blocking the pipe runs.

If all the spouts are clear and the cistern fillers have been cleared and you still have issues then its time to open pipe connections and use a very strong wet vac to try extract particles from the pipework.

Lenar3556 wrote: »

Interesting. I thought that type of foam product would tend to sit on top of the water.

Generally I would have thought the exact same. But somehow some bits of it made it into the pipework.
My guess is probably after absorbing so much water and whatever type of material it is, it probably sinks a bit and it's just bad luck. In the case I dealt with there was still loads of it in the tank which I siphoned empty then vac'd it clean.
Apparently it had been quite a while since the work was done, so it took time for it to happen.
The strong wet vac was the key to sorting it out.