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Just been looking at my old threads and thought I'd update six years on! It turns out that the area in question used to be where an internal chimney stack used to be. In effect the window is where the fireplace was located. The bubbling lime mortar is a reaction to the various sooty chemicals...

Thanks Noseall, Since posting I have read a few more tips on laying screed. I was going to prime the floor with a PVA type wash but most people suggest a simple cement slurry (including you I think). Dumb question is what proportions of what (including water) makes this up? Thanks

Roughcaster, excuse my chipping in and my ignorance but what mix ratios do you use to make this "cement grout slurry"? How much water and what consistency should it be?

I am building a solid hearth for a wood burner consisting an outer single layer of blue engineering bricks (see pic), infilled with 75-85mm screed and after about a month+ of drying top it off with Sheera slate tiles. The existing surface that the screed is going down on appears to be solid flat...

Blue engineering brick boundary to be infilled with 75-85mm screed.

I suspect that there may well have been a past problem elsewhere that has been fixed and what I am seeing is another sympton left untreated. Looking at other parts of the same wall there seems to be new'ish (i.e. neat looking) repointing. Maybe what I am seeing has been repointed with a dodgy...

I cannot say how often or how the window was last cleaned as we moved in back in June (I like mucky windows ;) ). There is no overflow pipe on that wall. There is a soil pipe outlet over a metre to the left of the patch but pointing between there and the affected area is fine. The only thing I...

Part of our property was built in 1860. The whole of the external brick work was painted about three years ago by the previous owner. I have noticed that that there is a small section of exterior wall under an upstairs window (about 1 square metre) where the pointing appears to be bubbling under...

Bubbling mortar of painted external wall.