Fixing Expansion tank back on wall

[craig1912]

Some clown thought a couple of rawl plugs through plaster board was enough to fix expansion tank to the wall. Woken last night as it fell off!

What are the best fixing to secure it properly. It s an external wall and there is a small gap behind the plasterboard and then the thermal grey blocks.

Would bigger rawl plugs into the thermal block be OK?

[craigthecoupe]

Is the plasterboard on studwork, or dot and dab? Probably better trying to get something solid. Whats the gap like behind the board? If its too large I imagine the fixings will sag in time?

[wolfracesonic]

Rigifix or similar.

[JoshSm]

Depending on the weight maybe fix it to a board and then fix the board to the wall, four fixings over a wider area is always going to be better than two close together.

[Mr Pointy]

Corefix - the red boxes, not the blue & green. They bridge the gap into the blockwork.

https://www.amazon.co.uk/s?k=corefix&crid=1A82...
https://www.screwfix.com/c/screws-nails-fixings/wa...

[craig1912]

Mr Pointy said:

Corefix - the red boxes, not the blue & green. They bridge the gap into the blockwork.

https://www.amazon.co.uk/s?k=corefix&crid=1A82...
https://www.screwfix.com/c/screws-nails-fixings/wa...

Thanks- was just looking at these after watching a you tube video

https://www.screwfix.com/p/corefix-connect-heavy-d...

[craig1912]

craigthecoupe said:

Is the plasterboard on studwork, or dot and dab? Probably better trying to get something solid. Whats the gap like behind the board? If its too large I imagine the fixings will sag in time?

It’s dot and dab- gap is only 5-10 mm so Corefix look ideal

[wolfracesonic]

Corefix, very similar to Rigifix I believe

[craig1912]

wolfracesonic said:

Corefix, very similar to Rigifix I believe

👍

[Magic919]

Would be worth checking it hasn’t failed.

[craig1912]

Magic919 said:

Would be worth checking it hasn t failed.

Didn’t fall far but how would I check it hasn’t failed?

[Magic919]

They don’t fail because of falling. They double in weight when they fail and fall off the wall.

Does it still have air and pressure or is it full of water?

[craig1912]

Magic919 said:

They don t fail because of falling. They double in weight when they fail and fall off the wall.

Does it still have air and pressure or is it full of water?

Feels quite heavy and there is water in there but not full of water. Pressure dial is normal. I don’t know much about this stuff so probably get a plumber out to check.
Hot water seems normal.