Rockwool Flexi For Timber Stud Partitions.

iamlegend2008

Hi

I have just had some rockwool flexi slabs delivered for using in first floor studwork of a block dormer.

The depth of the rockwool is 50mm which would allow me in theory to use 2 pieces between each stud (and only half the coverage ).

As its not that cheap, I wondered if there are any benefits of doubling it since the rockwool flexi slabs 50mm slabs are already supposed to be equivalent to 100mm rockwool rolls.

Any help would be appreciated.

Cheers

gally74

i used a product called metac, its made in ireland and i found it good to install.

i got it for around 48 euro a roll

Carlow52

iamlegend2008 wrote: »

Hi

I have just had some rockwool flexi slabs delivered for using in first floor studwork of a block dormer.

The depth of the rockwool is 50mm which would allow me in theory to use 2 pieces between each stud (and only half the coverage ).

As its not that cheap, I wondered if there are any benefits of doubling it since the rockwool flexi slabs 50mm slabs are already supposed to be equivalent to 100mm rockwool rolls.

Any help would be appreciated.

Cheers

I would put in the 100mm now.
Passive insulation like this is the best/most cost effective/best ROI way to save energy, assuming you make it airtight

iamlegend2008

Hi Carlow

The dormer has a full airtight membrane applied but Im confused about how I would make the rockwool bewteen the studs airtight.

I was considering stapling sheets of plastic to the studs to keep the rockwool in place for the next week or two until the slabber arrives.

Is this recommended ?

Thanks

Carlow52

iamlegend2008 wrote: »

Hi Carlow

The dormer has a full airtight membrane applied but Im confused about how I would make the rockwool bewteen the studs airtight.

I was considering stapling sheets of plastic to the studs to keep the rockwool in place for the next week or two until the slabber arrives.

Is this recommended ?

Thanks

If the walls in question are the vertical, internal walls in the dormer that meet the slope in roof then I assume the airtight membrane is along the slope so no need to replicate.
If u do put additional plastic sheets on, ensure they are on the inner.warm, room side and not the outer cold, attic space side. u could use slating lathes to hold in the stuff on a temp basis

if in doubt come back or PM me

RKQ

iamlegend2008 wrote: »

The depth of the rockwool is 50mm which would allow me in theory to use 2 pieces between each stud (and only half the coverage ).

Check with Rockwool for sound proofing of 50mm V's 100mm, then decide.
2 slabs of plaster on one side of the stud, lapped joints will greatly improve sound insulation.