Week 17: A Lick of Paint and Lots of Insulation

Posted by on Jul 9, 2013 in Warm EnerPHit office | Comments Off on Week 17: A Lick of Paint and Lots of Insulation

Week 17: A Lick of Paint and Lots of Insulation

Insulation is something we talk about a lot in relation to Passivhaus and EnerPHit – it’s a really key aspect to achieving the very low heating demand targets called for by the standards.

At Admiral’s Hard our wall insulation is a type of expanded polystyrene (EPS) block that has been treated with graphite in order to improve its insulating properties.  This week the builders have been applying the blocks to the walls using a “muck”, in a way similar to putting up drywall using the dot-and-dab technique.

It’s critical to the performance of the insulation that there are no gaps behind or between the boards.  The existing walls aren’t very flat so this means that care is needed during installation.  Where it’s impossible not to have a gap then low expansion foam is used to fill the holes.  This foam is great to bridge holes in insulation, but it’s no good for airtightness.

The long fixings pass through 250 mm of insulation and then into the outer leaf of the cavity wall.  Once all the insulation is in place, the entire area will then be rendered.

Inside, the plumbing is largely complete, the displaced kitchen units are returning to their rightful home, and a dado rail has been installed to carry power and network cables round the office.  The decorators have been very busy indeed, giving the place a splash of colour, and later this week we hope to show you some glimpses of the light, bright and airy space that’s being created.


DSCN1950shrunkThe insulation abutting a window installation, showing the airtightness tape (blue), plywood window mounting box, airtightness paste (green) and white window frame.  The gap will be filled with low expansion foam.







DSCN1955shrunkA block of insulation, covered in muck, ready to be mounted to the wall









DSCN1959shrunkA cut-through of the wall showing (inside to outside): the inner leaf of block; cavity filled with PU foam; outer leaf of cavity; graphite-treated EPS insulation.  Ultimately, a ventilation duct will be installed in this wall opening.