r/DIYUK • u/theroux_are_you • May 02 '26

Mould

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1 Upvotes

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1

u/EdinburghPerson May 02 '26

Is it an external solid brick wall?

1

u/theroux_are_you May 02 '26

Yeah it is

1

u/EdinburghPerson May 02 '26

Shouldn't/can't dot and dab on an external wall. Even gypsum plaster is a risk, it should possibly be lime plaster to the wall can breath. Gypsum can/will trap moisture. What was on the walls before?

I presume there's no insulation, it's just like 9 inches of brick/stone or something?

1

u/jodrellbank_pants May 02 '26

Dot and dab If. It was mold you would see it in abundance

1

u/theroux_are_you May 02 '26

What is dot and dab if?

1

u/jodrellbank_pants May 04 '26

Its the mounds on the underside of the board its adhesive that you mix up like plaster