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@muggles thank you. I will look into having a go myself as this seems relatively simple. If not I will get the plumber back. Cheers.

Incorrect. That thread was about identifying where the smell was coming from. My last post on that thread was "how do I get this fixed" and the thread died right there. So I have created another without all of the guff, focusing on how to resolve it. Care to contribute positively ?

Ok, we had an unvented cylinder fitted last year and every now and then our en suite would fill up with bad smells. We located this to the pipe that comes out of the unvented cylinder which has a tundish on it. The problem here is that this pipe drains into the sink waste. As a result sewer...

Nope. Its just that RW3 is a better sound insulator. Its a better grade of the same product - that is all.

I am using Rockwool RW3 for floor sound / thermal insulation on the first floor and the loft floor.

How is this a DIY disaster if you hired someone to do the work ??? :rolleyes::rolleyes::rolleyes:

Easy peasy. Chip out, fill with flexible filler, sand and repaint. alternatively, if its a persistent problem you could always cover it with beading.

I use a low tack masking tape for such things and take it off straight after painting - normally works out ok.

Assuming that you're replacing the existing foundations too ?. They will be suitable for a conservatory but not for a full on brick extension.

I used 100mm Rockwool RW3 myself this weekend in our bedroom floor for sound / thermal insulation.

What has this got to do with Regs & PP ?

£20 ??, where do you shop ?? https://www.diy.com/departments/resolva-ready-to-use-moss-killer-1l/1318593_BQ.prd You want to kill moss ?? - use moss killer o_Oo_Oo_O

Moss killer - available from any gardening centre

Did you paint it with a watered down coat first ? if not you should. The last time I used exterior paint (Dulux Weathershield) this is what it suggested for new / unpainted surfaces. Plus, this should really be in the painting and decorating section.

Did similar myself in our previous solid walled 1880's house. We removed all internal plaster, had an injection damp proof course done, damp retardant scratch coat on the inside upto 1 meter high and then 50mm insulated plasterboard on the inside of all external walls. Result - toasty house...

I intend on doing just that - use Gyproc Thermaline plasterboard on top of Kingspan PIR. The Gyproc stuff is already in place so I have no choice and I plan on temporarily removing it and put in Kingspan between the rafters. Are you suggesting that I need an additional vapour barrier ?

Not needed - he has no membrane at all. I will be doing exactly the same job, 50mm PIR with insulated plasterboard. I have no membrane either and I could go with 75mm PIR if I wanted but I am putting in a 25mm airgap anyway.

Never heard of em. Take them back if they're not fit for purpose. Please don't demand a refund - you are perfectly entitled to one so please just politely request one and they should politely comply.

My floors are coming up on our first floor as we are having some wiring done. For thermal & sound insulation I have used 100mm Rockwool RW3. I will be using it again when the loft floors come up too.

On what basis do you think they look too shallow ? what are you comparing them too ?