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Ironically the 3240 is fine , it’s the other stuff that failed and stunk of egg, I was convinced it was dodgy but I’m no expert. Is the reinforcement matt not a good idea then if I encapsulate it in the compound? I guess Mapei would be best placed to answer that. I pulled out the thermal...

Hi, I spoke to the manufacturer of the panels and they said any deep leveller would be fine although they sold their own product (which wasn’t supplied due to stock) Their instructions for install did not state a primer was required over the panels, so no, it was not primed… heating was off...

Yeah it was definitely high smell, completely stunk the house out for weeks!! I used Mapei 3240 in another room and as far as I can tell, no issues (although now carpeted I’ve peeled back a corner to check) and same panels, no problems at all, no cracking etc and there was no smell. The stuff...

P.S - sorry, I didn’t answer some of your other points. the levelling is up to 18mm deep but variable as the castellated panels vary in height in places. They also have holes in them so the compound flows into certain parts of the panel, presumably to interlock it all together. Certainly seems...

Hi, thanks for the reply, Levels aren’t an issue. the kitchen is new and has been installed with the raising of the floor taken into account for the plinths etc, but half of it isn’t installed anyway, as we wanted to get the floor done before installing end panels etc so plenty of scope to...

Hi all, looking for advice on how to get around a disaster of a levelling job. Basically we have cracked and slightly hollow sounding levelling compound in a low profile underfloor heating floor. It’s mostly solid as it’s bonded to the castellated panels, but areas sound hollow in places...

Hi, I’m just painting a newly plastered ceiling which is 12mm plasterboard on resilliant bars. The bars were installed at 400mm centres and every joint had a bar installed to ensure all edges had support. The joints were all taped up with skrim. It looks like theres a small amount of movement...

i now have 150mm of well compacted hardcore down in the extension and around 50mm of sand for blinding. Does the sand need to be wackered as well, at the moment I've just levelled it down with a float? Thanks in advance Sam

Could it not be filled with hardcore instead then?

Whats the purpose of this exactly? I see that you should slope it away to allow water to run away from the internal wall, but surely it would be better if it just dropped further and soaked away well below the DPC? Thanks in advance Sam

Thanks tomfe

The outside of the existing house is a very corse spar dash (council style) but it's very well bonded and not chance of it coming away. It is painted though. Do I need to remove this where the wall starters will be fixed or can I leave it on, screwing the wall starters to the face of it? I...

What height do you have to work with? I'm guessing around 70-80mm? You could look at 50mm insulation with a floating gypsum based dry screed underfloor heating board (18mm), thin leveling screed over the top and carpet. This would give you decent results as the board and screed has some thermal...

About 1.5 at a guess, the footings went lower to prevent any potential loading being applied onto the drains, that's what B.C wanted anyway, plus the ground above that was all made up and no good apparently anyway.

Hi Woody, That sounds alarming! I did question the fact that they weren't really 'attached' together with much. The foundations are about 2 metres deeps and have been poured into shellet, pretty solid! The drains are dug into this too, ex council job. Do you think there will be issues? Not...

Thanks for the replies. We have no SE as it's being done through a self build notice with BC. It is a pair of drains, soil and rain water, hence the 1000mm trench they dug to lay both in. Long enough is strong enough sounds just like what he was saying! Thanks Sam

I've got to build over the set of drains for the rear single story extension I'm building. Been a really tough job getting to good ground (2 metre deep) and the build over paperwork took ages too. So I've got concrete poured and now need to bridge where the drains are. They are about 1000mm...

Just to add, 150mm cavitys were talked about by builders I've spoken too, both online and in person. Having never come across 150mm cavitys in all my years of drilling through walls was one of the main reasons for posting in the beginning!

Thanks Garyo, I think it's the mental block with having a cavity and then filling it with something that absorbs so much moisture. In my head I'm thinking it's better to have an air gap but get your point on being able to fit the celotex batts well for them to perform as designed. Is it quite...

Hi Noseall, Certainly not naive otherwise I wouldn't be asking the questions! I'm not a bricky, no. I'm a heating engineer so I'm not completely wet behind the ears in the building trade. I'm also up for doing most things and like a bit of a challenge. Obviously I'm asking you guys who have...