I've had few jobs with similar descriptions
Have check your chimney head possible loose chimney pots / cans / sattalite disk or an over size aerial pole Or loose roughcast maybe there's an expansion pipe next to or behind the chimney
When you hear the noise try and check outside check for...
Hi guys hope someone can help me I'm a fully qualified slater / roughcaster and use to having all my matiral drop off for me with normally loads spare lol. I was measuring a wee job and drew kinda blank to how much granite dust to order the customers paying to get it delivered in bulk and don't...