Week 10: Windows and walls

Posted by on May 23, 2013 in Warm EnerPHit office | Comments Off on Week 10: Windows and walls

My first impression going on site today is that a big step forward has been taken since last week. Even though there’s still a long way to go it’s definitely in the early stages of starting to look like an office space now. I hope this encourages the build team who are in there day in day out and probably don’t see the same progress!outside view wk 10 rs


The damaged lintels have all been successfully replaced now and all but one of the Rationel window units have gone in upstairs (The extraordinarily heavy windows for the shop downstairs will be going in at a later date). The boxing in is also largely finished, and the slight angle of the reveals has done a marvellous job of bringing light into the room. The last job for each window is to ensure it’s sealed with foam before the cavity wall insulation is pumped in fully.

Insulating the walls – internally….

The building has 3 external walls and one party wall. The team are busy internally insulating the party wall with 80mm rigid foam insulation along the whole wall in the loft space, and along the top section of wall in the office space. This top section of wall corresponds with the loft space in the neighbouring house. Underneath, where the wall adjoins a heated space next door polystyrene bonded plasterboard is being used to insulate the wall. As this is much thinner there will be a step in the finished wall surface (once it’s been plasterboarded over), but this won’t be noticeable once we’re in and shelving is up.

The two types of insulation used on the party wall

The two types of insulation used on the party wall

…and externally

There’s also the external insulation to think about –cavity fill plus panels for external wall insulation. The scaffolding had to be dropped to allow the cavity fill guys enough access to the walls – that’s been done now and they came yesterday to drill the holes ready to fill with the PUR insulation that we’re using to ensure all the air gaps are filled up after the results from the last air test showed just how draughty the cavity was.

Once the cavity has been filled, external insulation boards will be going on to the walls. We’re using Neopor – an expandable polystyrene (EPS) which incorporates tiny flakes of graphite within its structure. The idea is that the graphite reflects radiant heat, which improves the insulation capacity of the board. It also uses air as its cell gas – no halogenated nasties. The Neopor boards are due to arrive on Monday – 40 cubic metres worth. Nevermind any difficulties in putting it up – our first difficulty will be finding a storage home for it!