WARM low energy office EnerPHit Week 3: A change of view and flooring goes in

Posted by on Mar 28, 2013 in Warm EnerPHit office | Comments Off on WARM low energy office EnerPHit Week 3: A change of view and flooring goes in

I’m just back from a quick visit to see how work is progressing on site, and can’t believe how different it looks from the week before.

The key difference is that one whole section of internal wall has gone! The decision was made to open up the space, and now, instead of two office rooms and a narrow corridor, there is one large bright, welcoming space. It looks great.


The other main job of the week is the flooring. A floating floor is being constructed, consisting of several layers: hardboard, acoustic membrane and the all important air tightness layer.

Hardboard is there to protect from any damage from the floorboards underneath and to protect against undulation. The acoustic foam layer serves two purposes – noise reduction of course, but most importantly in this case protecting the membrane from wear points or damage. There are two layers of foam either side of the airtight membrane, plus Oriented Strand Board as the final layer laid on top of everything before the finished surface.

The airtight breather membrane is the key layer. I was surprised to see how thin it is, but its strength belies this. It is actually a roofing breather membrane, formed of a spun high-density polyethylene, which allows moisture transfer but not draughts.  It’s this layer which is carefully sealed to the plaster of the walls with air tight mastic in order to create the air tight barrier. It’s also important to ensure that this layer is continuous across the whole floor area, so for timber partitions we strip the plasterboard away to seal to the timber soleplate, again achieved with judicious use of mastic.


Next week: moving outside. Work will start on the roof.