is this damp or something else (images attached)

happypie

I have got this in my recently renovated house (1 year old). This is an internal wall, one side is living room where the damage is and other side is bathroom.
No other walls of living room are affected including outer/external walls (where originally rising damp was present before renovation/dpc treatment).

https://ibb.co/Tv4cL2J
https://ibb.co/KWqdXsv
https://ibb.co/Vm3VdYk


i am confused if its leaky pipe work, rising damp or moisture building on a wall (but why on just this wall only).

Will appreciate any ideas.

rach_k

What's against that wall in the bathroom? A leak would be my first thought.

ST1991

hmmm - i had something similar on one of my internal walls when i moved in 4 years ago - but mine is residual damp in the plaster from rising damp, and salts coming through above the DPC.

With it being that low on the wall though, i would assume water is getting in somehow

happypie

rach_k wrote: »

What's against that wall in the bathroom? A leak would be my first thought.

Visibly there is just towel rail and pipes for it coming from the wall. Attaching image for that as well.

https://ibb.co/j5VVVrt
https://ibb.co/yg0zWDw

I don't really know if there are any water pipes in the wall.

dunroving

happypie wrote: »

Visibly there is just towel rail and pipes for it coming from the wall. Attaching image for that as well.

https://ibb.co/j5VVVrt
https://ibb.co/yg0zWDw

I don't really know if there are any water pipes in the wall.

Judging from the radiator photo, there's at least central heating piping in the wall cavity.

happypie

Yes. But it's only from floor to radiator valve height.

naf123

If the boiler pressure ok it's likely just a touch of plaster bubbling from the renovation?

headpin

What type of partition is it? ie stud, brick, block?

What type of finish is on the partition? ie wet plaster (no pun intended), plasterboard on stud (with or without skim coat?), dot and dab plasterboard?

Before you can eliminate and define what the issue may be the base materials need to be identified.

Unless wet plaster used then unlikely to be residual drying out.

dunroving

happypie wrote: »

Yes. But it's only from floor to radiator valve height.

Which, if the photos are on the other side of that wall, is where the damp patch is ... no?

happypie

naf123 wrote: »

If the boiler pressure ok it's likely just a touch of plaster bubbling from the renovation?

yeah boiler pressure is ok as long as one tap is on.
if i switch on both downstairs and upstairs shower then pressure goes down - which i guess is common with combi boiler.

i have fixed it once (sanding, putting easy filler, sanding again, painting) but it happened again in a month time.

happypie

headpin wrote: »

What type of partition is it? ie stud, brick, block?

What type of finish is on the partition? ie wet plaster (no pun intended), plasterboard on stud (with or without skim coat?), dot and dab plasterboard?

Before you can eliminate and define what the issue may be the base materials need to be identified.

Unless wet plaster used then unlikely to be residual drying out.

it's bricks wall, multi finish plaster, crown paint on living room side. other side is tiles.

initially i thought its because of builder painting on wet plaster. so i repaired it in summer month. but it happened once again in a month time.