bubbling

Hi everyone, I've been experiencing some constant air bubbling noise on the top floor of our house. I've done some investigating and I think I know what's happening but I'm not expert so I figured it would be best to check with people in the know. I've tried to map out the system so here goes...

Read a couple of other threads that might go some way to explain this, but was going to post this anyway, just in case they end up being unrelated. Painting my hallway, stairs and landing in the same matt magnolia; all has gone well except for the two opposing stairs walls; about 1-5 mins after...

We have an open vented S-plan system with an old (but ultimately quite reliable) Ideal Classic NF50 gas boiler. This is one of those older systems where a small controller is in charge of the two zone valves, the pump and the power to the boiler. When one (or both) valves are open and the pump...

As you can see from this first picture, we are having a massive infiltration problem around the chimney breast. To give some general information, we are at the ground floor of a two storey Victorian house. To the right of the picture there is the external wall. We have been living in the...

Guys I decided to embark on a DIY bay window GRP roof....never again. Anyway it looked fine and more importantly it's been waterproof ever since. Fast forward 6 months, I have just noticed bubbling on one side? I have no idea why and hope you guys can help. Will it be fine? No water leaking...