Insulated Plasterboard Installation

Redfowler11

In the process fitting insulated plasterboard. Currently considering two options
1) Mushroom fixings directly to block wall
2) tanalised battons fixed to wall
60mm insulation in cavity. Looking to maximise internal insulated plasterboard thickness but need to consider dew point. Any advice or recommendations ?

chief80

The recommendation for a new build block house is to cover the block wall with a sand and cement plaster . Screed the wall level and straight and close it in with a float. This is the very best way to airtight a block wall .
Once dry ,fix your insulated slabs directly to your newly plastered straight wall with mushroom fixings
With only 60 mm cavity maybe think above 62 mm or 80mm insulated slab if the room is big enough to lose it .

Leaving a gap between insulated slab and block for battens etc makes the insulated slab ineffective and its money down the drain
This gap allows drafts coming through block work out under skirting board and hot air out too, sort of like thermal looping.

MicktheMan

chief80 wrote: »

With only 60 mm cavity maybe think above 62 mm or 80mm insulated slab if the room is big enough to lose it .

And where will the dew point be?