the first Certified Passivhaus in England, by Seymour-Smith Architectsthe AI PassivHaus

10th September 2009

Work is progressing well with the block walls inside the house.

And the stone kitchen garden walls are now finished, enabling the scaffold to be taken down in preparation for the waterproofing of this area.

Scaffolding is now being erected around the barn for the roof works to get started...

11th September 2009

Beautiful weather (thankfully) on the extremely exciting day of the roof waterproofing.

This amazing system is all contained in the back of this van, where it is being heated up in preparation to be sprayed on to the roof.

The area is first primed to ensure the waterproofing adheres properly.

The Fosroc Polyurea WPE waterproofing is then sprayed on by Lee and his team from Walford Services.  This is the ultimate coating system, having been developed over the last 20 years for use in waterproofing for basements, reservoirs, roof and deck finishes, concrete and steel protection, tank lining, asbestos encapsulation and pipe protection.

This stuff can be walked on after just 10 seconds, and is incredibly durable, elastic, and of course, waterproof...

15th September 2009

With the waterproofing (to this area anyway) complete, we're able to crack on with installing the insulation...

and backfilling.

The pile of insulation off-cuts to the right of this shot is about to come in useful, to create a mound on the roof without having to use too much heavy earth.

16th September 2009

The beautiful and pristine looking waterproofed roof deck, cosily surrounded by insulation and backfill.  This is finally starting to look like an "underground" house...

Looking down from the barn scaffold, lots more blue Dow Styrofoam insulation has arrived, ready to insulate the barn roof.  The field has also been half ploughed, changing our surroundings once more.

17th September 2009

It's very odd (and splendid) to be able to walk right onto our roof.

And as the house roof starts to be insulated (with a very toasty 360mm Dow Styrofoam Roofmate SL-A), work excitingly starts on the construction of the roof over the barn / office.

18th September 2009

The new rafters just before a big storm.  The weather is always dramatic up here...

19th September 2009

Looking from the other side of the barn, work is progressing well.

20th September 2009

Half of the roof insulated, and one of those fabulous evenings when the honey coloured cotswold stone seems to glow.

22nd September 2009

Photo by Samuel Ashfield, courtesy of Dow

The insulation boards are interlocking, so most don't need to be stuck, apart from these edge pieces, which Tom demonstrates being stuck with Dow's splendid Insta Stik foam.

Photo by Samuel Ashfield, courtesy of Dow

We're using Dow's Roofmate MK on top of the insulation.  This acts as a separating layer, and because it is waterproof, it will prevent almost all of the rainwater from passing through the insulation, preventing the cooling effect that would result, and therefore making the insulation much more effective.

23rd September 2009

Now that the roof structure and some steel tie rods are in place, the team from BAHull are back for the day to dismantle the elements of the steel frame that are in the way of the roof covering.

It's reassuring to see the barn walls staying (almost) upright - not that there was any doubt...

On top of the Dow MK layer, we're using Fosroc Sheetdrain - knobbly rigid plastic to form voids for drainage, topped by a layer of geotextile to keep the voids from filling with silt.

24th September 2009

Tom carries on with the drainage layers, thankful that it's not too windy.

Barn wall upstands are insulated to provide continuity with the layer of insulation which the walls were built on.

And the guys from AJS roofing get started insulating the barn roof, using more of the blue stuff, both between and above the rafters.

26th September 2009

Photo by Sara Fakhro

We couldn't drive a digger onto the roof to load the earth on (well, the far corner anyway), so we had a "beer, banger, burger and barrow party" instead and got our friends to do it - genius!

Photo by Sara Fakhro

Some of the many willing workers (thank you guys!) line up the barrows...
(offcuts of insulation covered in the Roofmate MK paper form the mound to the left of this shot)

Photo by Paul Crossley

and it takes a surprisingly short time (under Paul's expert management) to cover half the roof (the rest will be done when we next have a large digger on site).