Looking for some much needed expert advice. This problem has been bothering me for years, I have searched but cannot find a similar case (please feel free to point me to one). I make a decision, then back track, for fear of doing the wrong thing.
Recently, a family member informed I have been told my house smells musty and so do my clothes. A touch embarrassing considering I cannot smell it, and have been living here for 5 years. This really spurred me on to fix it (and probably why have posted on here). Pretty sure this stems from my front porch. Previous owner had put a bit of plasterboard up part-way. I took down, to find plaster and cement render covering the stone work. I don't know if this is lime plaster, but seeing as they put cement on one half, I doubt it. I notice darker patches on the wall, and some of the mortar feels damp / crumbly. (Attached photos)
I was planning on putting insulated plasterboard in there, battened/fixed to stonework. However, I think this might be the wrong thing to do as the solid walls might need to 'breath'.
About the house: It's detached and has solid stone walls (circa 1800-1900) on the front and side walls. It has been extended so has cavity walls at the rear, but the front of the house is cold. Especially downstairs. Central heating would have to on all day to make it comfortable, and we pretty much need the log-burner on in Winter to make it pleasant. We've fitted a new composite door to try to improve. Doubled attic insulation. Fitted a nest thermostat to improve matters. Now have a dehumidifier on the go.
Solutions: Add ventilation (and how)? Insulated plasterboard? add Heating?
Your advice would be very much appreciated!
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