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thanks mate good to know, gonna do a 50mm cavity its a small room already and trying to claw some space inside.

what you mean 2 skins with no cavity?

Hi lads, I know 100mm is standard size cavity, but for a 8x8 small build can I make it less? can it be 50mm? thanks

Hi lads I need to lay some hardcore in my back garden in prep for later when I decide what to do with it but I need it under control, do I get the buff hardcore for this? so its laid and can act as a pathway until later? I would like it smooth once wacker plated...not big pieces, so do I get...

OK mate good to know will get sharp.

Its for a concrete slab for a 8x8 small room

Hi lads I have run out of ballast with stone not very good but used it as first layer. I have loads of building sand left, can I mix the building sand with stone mix I can break up from mishaped stone and use that as my final layer? can I use building sand as oppose to sharp sand for the...

Thanks mate will do that and lose a few mil in the cavity.

I just checked and the bricks are 100mm and blocks are 96mm not 100mm? I thought all breeze were 100mm thick. So for the slight overlap does this go on inside keeping exterior flush to blocks?

Hi lads So bricks are slightly wider than breeze blocks, why is this? I am assuming the slight overlap goes on the inside keeping brick and block flush on the exterior? Thanks

cool thanks for the tips will go down that route internally.

Ok thanks a lot for feedback and the *******ing :) I will stick with 100mm Rockwool cavity in the 100mm cavity between the 2 skins, assuming I push into place as its a 100mm into 100mm, also then I will add 50mm internal on the inside walls then plasterboard. Thanks

About £100 more the 80mm with 8 slabs is £29 and the 100mm with 6 slabs is £43 https://www.ebay.co.uk/itm/Rockwool-Cavity-Insulation-Cavity-Wall-Slabs-Loft-Insulation-50mm-80mm-100mm-/172694923672?_trksid=p2385738.m4383.l4275.c10&&&&&&&var=471490055194&varId=471490055194

Thanks, t works out about £12 more perpack for 100mm and then there is less slabs too for coverage, is there anything else I can use cheaper than rockwool at 100mm for the cavity. I intend to also put 50mm acoustic sound slabs on the inside of the build.

Hi lads Can I use 50mm or 75mm in cavity walling and not use the 100mm, its a small music room extension and trying to cut back in costs? 100mm fully fills the cavity I know but would it be k to not totally fill it. Thanks S

cheers lads :) got order sorted brick and blocks on route.

Hi where do you buy them from? I dont see cart on page?

Thanks mate so dense ones are better. Seen those at Wickes, thnaks.

H I am building a small music room and not sure what breeze block to use? do I use standard blocks 7N? Sound proofing is better than thermal want to keep noise out.. Thanks

Thanks man will get some of that rubber and this goes under the newly built wood frame. So use rockwool r3 or rwa45 slabs internally on the inside frame then plasterboard on top...and the cavity between the skins walls of 100mm add normal 50mm Insulation there too? That right