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Thanks for your input, dann09. In answer to your questions... 1. Flat roof is a flexible plastic coating on membrane on timber decking. It is all perfectly sound. 2. Fall is away from chimney stack. 3. One flue dormant, chimney capped; one flue active from ground floor fireplace...

Yes, I did mean lead tray. Sorry for confusion. Will edit original post to clarify. Have also included a sketch to illustrate the problem (click on thumbnail). The chimney was originally built into an external wall which has now become an internal wall in a double height atrium space with a...

As a result of having an extension built, the lead tray in the chimney is now below the roof level and is channelling damp into the internal wall and plasterwork. This has been managed by treating the entire chimney with silicone damp-proofer but this only lasts about 5 years and is not 100%...

I think the valve is being slow to close fully in which case replacement makes sense but with a better/top quality valve that has a rapid shut off. The buzz seems too high pitched to be any sort of water hammer as suggested in another earlier post. Any suggestions for the best valve on the...

When the ball valve on the main water tank is close to shutting off there is a not very load but very annoying buzzing noise in the rising main pipework. This is not the usual water hammer, ripple effect or noisy flow of water in the pipework. It sounds more like a vibration emanating in the...