Creation of service void

We have put so much effort into creating an air-tight envelope right around the house that we want to make sure that it will not be inadvertantly punctured by the electricians or plumbers as they wire and plumb the house, nor will it be damaged in the future if pictures are hung on the walls, for example, and the fixings penetrate the air-tight layer.

Therefore, we are putting battens over the second layer of insulation to create a void in which cables and pipes can run.  Over the top of this, we are fixing OSB (oriented strand board) to give a firm layer for fixing things to and also to avoid the hollow sounding rooms that can result if plasterboard is fixed immediately over the void.

Battens over the second layer of taped insulation.
More battens on an external wall. All the taping up between the ceiling joists can be clearly seen, too.
On the left, there is acoustic insulation between studs of the partition wall forming the ensuite to the master bedroom.
OSB is attached over the battens.
The gap left behind the OSB for cabling, etc is clearly visible here.
Cut outs for the socket and data back boxes.
Finally, plasterboard over the OSB.
This will then be given a skim finish.

1 Comment

Mashed Potato Peas Sausages Boiled Egg and Gravy

about 6 years ago

Hi there, great site, I'm currently in the process of considering insulation for an old stone Victorian detached home in one of the coldest villages in the UK, high up in the Pennines. I need to thoroughly insulate the place as the stone rubble walls are leaking heat. I noticed you said in the text above that the thermal board was the second layer of insulation, what is your first? Also my place is not bad for damp at all but I wish to insure that there's no problems with condensation against the old wall. Looking at your plan I would guess I could possibly get away with thermal board (foiled both or one side(s)) dot and dabbed to the reasonably square plasterwork, 60mm should do it, then battons for services, board and then plasterboard. Would you consider a damp proof membrane directly to the wall sensible with taped seams on the otherside, or would this be overkill. Also would you consider it a good idea not to leave a gap between the wall and the insulation. Anyway I've become a minor expert in thermal stores and stoves and I'm just looking for help now in my new chosen subject of insulation :-)

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