Mold blocker paint before matt emulsion

[DIY67]

I am thinking of priming corners of the lining paper that is prone to slight black mold in Winter with Zinsser Perma White Self-Priming Interior matt Paint. Will this be ok to paint over with a Lick emulsion colour to prevent mold ?

 

[Wayners]

Add vc175 to lick paint as that will stop surface mold growing.

If mold stains through paint use a stain blocker like a BIN or a cheap own brand spray can.

Consider a dehumidifier for winter and run for a few hours every night

 

[accelerator]

I think it will be. What are you worried about?

 

[DIY67]

I was concerned it would inhibit the mould blocker working

 

[Wayners]

Wash mould off with a splash of bleach in water.Let it dry and paint over. Normally fine as it's surface mould from condensation.
All paints have a little biocide in anyway to stop the paint going bad while on the shelf.

Mould will push through if the damp is in the wall but that's not condensation.
If a bedroom check loft side for insulation at that spot as sometimes missed

 

[foxhole]

If you have mould you have inadequate ventilation.

 

[DIY67]

Wash mould off with a splash of bleach in water.Let it dry and paint over. Normally fine as it's surface mould from condensation.
All paints have a little biocide in anyway to stop the paint going bad while on the shelf.

Mould will push through if the damp is in the wall but that's not condensation.
If a bedroom check loft side for insulation at that spot as sometimes missed

I think its condensation as no cavity wall of Victorian semi outside wall. Both have insulation lining paper which is very good but upstairs bedroom started to get smatterings of black mold due to being a cold corner on year 2, no ventilation (if it did it would make the house would be cold in winter) and shelving with books etc against it.

 

[accelerator]

I was concerned it would inhibit the mould blocker working

It will be fine.

As above, you may have a ventilation issue. Also, and the more likely culprit IMO, water will be getting into the wall from the outside and making the lining paper wet and cold. So, investigate whether you have water coming into the wall.

 

[Wayners]

@DIY67
Cork plaster maybe your answer. It's an interesting product.
You can use thermal polystyrene rolls then wallrock paper over as the DIY solution

 

[DIY67]

It will be fine.

As above, you may have a ventilation issue. Also, and the more likely culprit IMO, water will be getting into the wall from the outside and making the lining paper wet and cold. So, investigate whether you have water coming into the wall.

There is some dripping coming from the end of the cast iron gutter in wet weather but I just can't repair it (and been told by professionals that they need replacing with plastic (which I don't really want) as can't be repaired) I have Stormdried up to just above the windowsill but on a ladder and being terrified of heights it's as far as I can go, as well as running out of product which aint cheap. Perhaps get another tub and use a long handled roller.

 

[accelerator]

I expect there would be a way to repair the guttering, you just haven't worked it out yet.

I expect water is getting in to your wall from poor guttering performance. Your downpipe is quite small bore. I would not be surprised if the downpipe was blocked, and water could be backing up in the guttering. I think it's quite likely you do have a water ingress issue, so it would be best to fix that as well.

 

[DIY67]

I expect there would be a way to repair the guttering, you just haven't worked it out yet.

I expect water is getting in to your wall from poor guttering performance. Your downpipe is quite small bore. I would not be surprised if the downpipe was blocked, and water could be backing up in the guttering. I think it's quite likely you do have a water ingress issue, so it would be best to fix that as well.

The downpipe is a replacement of the old rusted cast iron. It was the same bore diameter.

 

[accelerator]

Have you checked for gutter blockages recently?

 

[foxhole]

I think its condensation as no cavity wall of Victorian semi outside wall. Both have insulation lining paper which is very good but upstairs bedroom started to get smatterings of black mold due to being a cold corner on year 2, no ventilation (if it did it would make the house would be cold in winter) and shelving with books etc against it.

Ventilation keeps a home dry , does not make it cold..

 

[DIY67]

Have you checked for gutter blockages recently?

No because it's too high up for me but water comes down the drain pipe normal enough.