damp on chimney breast

[marsaday]

i have damp again on the chimney breast in the attic bedroom.

i thought it was the chimney leaking and so redid the pointing last autumn. however the damp is coming through again.

could it be the flashing?

also would i need to put a vent hole in the wall ? the chimney is used by the gas fire in the lounge so gases will becoming up it.

 

[drnail]

coild be the flashing what did you repoint ?? just round cowel of whole chimney

 

[marsaday]

i re-pointed the stone work as it was mud !

the top was in good condition with 2 little metal breather cowls (holes in them).

the flashng didnt look that good though.

 

[drnail]

is stone then and not brick? could be coming in on the flashing what material is the flashing

 

[marsaday]

yes stone and flashing is lead

 

[drnail]

long as lead is not split and the is 3 inch cover on tile wont be coming in from there , prehaps stone work has become pourus but i doubt it , is the cowel pots seated and pointed nicely no cracks etc , and have you got a pic ??

 

[marsaday]

i will take a pic tomorrow.

 

[hotrod]

i have damp again on the chimney breast in the attic bedroom.

Hygroscopic salts

 

[noseall]

i have damp again on the chimney breast in the attic bedroom.

Hygroscopic salts

I concur.

 

[dave1953]

Absolutely concur also, if the damp staining is brown, the years of wood/coal burning will have left deposits up the chimney brest that will undoubtably bleed through the brickwork.Only way out is hack off back to substrate and waterproof render then skim finish.

 

[marsaday]

here are some pics

View media item 19218 View media item 19219 View media item 19220 View media item 19217
i realise the wall of the house have very poor pointing towards the top (where meets roof) and so this needs attention.

however, the chimney flashing is pretty crap - would that be correct?

 

[drnail]

not in the best of conditions also looks like you have lead soakers and there s not enough cover of lead goin to them , also is there any damp on the perling in pic 3

 

[marsaday]

no perlins are dry, just stained up.

 

[drnail]

dont think thats problems is exsisting damp in bricks of that summat salts . any way to the problem at hand that flash band deffo need s replacing only last 12mths any how.

 

[marsaday]

i think the chimney breast is damp because of old flashing and so i will sort that.

what about the other damp/black mold underneath the roof towards its end (small wall). could this be due to the bad pointing or is it condensation?