I need advice on how to proceed with decorating over old mould/damp.

Wiping my hand over the patches and it's dry and powdery.

The damp was primarily caused by ivy, blocked gutters and lack of ventilation by my tenants. 

I don't want to do a bodge job but not sure how to treat either. 

Thanks

Edited January 22, 20251 yr by Dee

Scrape and clean thoroughly 

Bleach Leave to dry 

Then use a cheap oil based undercoat to block staining 

The pic of the ceiling shows evidence that possibly loft insulation or a flap of felt / membrane is causing trouble. Have you been up there to investigate?

Damp / mould down below just looks common to ‘life’, so will probably disappear with some ventilation.

@NickfromwalesI havnt been in the loft yet but there was massive ingress of ivy up there that has been removed, could that have caused damp?

6 hours ago, Dee said:

@NickfromwalesI havnt been in the loft yet but there was massive ingress of ivy up there that has been removed, could that have caused damp?

Defo. Have you removed it inside & out? I'd recommend getting up there and seeing if it is 100% gone.

I wish i could swear on this forum! I prepped the mould with mould spray, rinsed and let dry for 48hrs.

I then used Zinzer anti mould paint over the areas treated (extensive!) and let dry for 48hrs.

Come to overpaint with trade emulsion and the zinzer is shining though...ALOT!

Decorating is my nemesis and I have a 2 bed property to paint!!

What have I done wrong.....see photo

Feck or bollocks is fine. Let it all out. 
 

Id recommend putting a good quality lining paper on first, as oil based stuff hates taking emulsion. 
 

Wallpapering would hide these sins far more robustly. 

Not an option to wallpaper as its a rental.

I'm on my 3rd coat of emulsion and still the xinzer is showing through!!

It's unbelievably bad! Even coated over the zinzer with zinzer stainblock but no difference. Won't be using that again 

Don’t spot prime with the zinzer, you need to paint a whole panel, it will take two good coats of quality emulsion to cover. 
this is the one I’ve used to good effect. 
with two Coates of johnstones durable Matt over the top. 

Edited January 26, 20251 yr by Russell griffiths

Hi,

I have just used that product but I have spot treated but large areas due to mould. Emulsion is Leyland trade; is that good or bad?

I also used that zinzer over the fireplace where water has been trickling down but it hasn't stopped the damp coming through either....I'm perplexed, it shouldn't be this difficult!

You could try two coats of the zinzer then two coats of acrylic eggshell 

if you still have a live mould behind the paint it could be tricky, and you might need to strip right back to the plaster and really kill off that mould first. 

Hi, The mould came away easily when I cleaned it all off....(it was extensive).

Its the zinzer that's caused a bigger problem than the mould.

Stripping back isn't an option either as tenants due to move in soon. 

probably a bit late, but bleach on mould is a no-no, it doesn't get rid of the mould, just hides it away.

 

Use a purpose made mould killer or equal parts white vinegar and water solution to properly get rid of it, leave it to sit for an hour before wiping, and don't forget to extend the treated area beyond the bit you can see, for all the bits which aren't yet visible to the eye.

@MikeGrahamT21....There are so many products and much contradicting advice. I read the vinegar solution doesn't work? Anyway it's after the fact now haha. I didn't use bleach but a purpose made thing from amazon. Cleared the mould off really well

Edited January 28, 20251 yr by Dee

2 hours ago, Dee said:

@MikeGrahamT21....There are so many products and much contradicting advice. I read the vinegar solution doesn't work? Anyway it's after the fact now haha. I didn't use bleach but a purpose made thing from amazon. Cleared the mould off really well

Yeah, white vinegar is a traditional solution, but a proprietary mould remover is also ideal, just not bleach