chimney leak

[sbeswick]

hi,
any ideas? read about hydrostatic pressure as possib but waterproofed the brick an i still have water stain in bedroom where chimney wall is.dont no where water is getting in as covered flashing with polythene-still got in! also pointed the brick and filled any gaps.have cement cap on chimney little vent holes circular
cheers steve

[majakdragon]

sbeswick, Welcome to the DIY Forums.
The leak may not be AT the fireplace. Since you have pretty much covered everything there, it may be a roof leak that merely uses the chimney as an escape route. I have rarely found a roof leak where the water appears. It seems to always have run from somewhere else and then dripped where I saw the leak. Check upslope from the chimney. Good luck.

[sbeswick]

many thanks i will have a look tho i did check roof and no obvious holes/gaps

[jmorgan1]

Is there a cricket behind the chimney? Does is leak with snow, or rain or both? Any icing behind the chimney? What's uphill from the chimney?
Jim

[sbeswick]

i in uk so no crickets! only had rain so not sure re snow-but below roof slates chimney is dry on outside brick ,and this is in loft area above room where water stains on wallpaper? so i assume water is coming down inside of chimney brick and bridging across to exterior surface where wallpaper is.thanks
uphill from chimney is @7ft to long side of roof ridge-no obv damage or cracks etc