24/08/2014
Green rood and rooflight

Since my last post there has been substantial progress on site.

A big thanks goes out to SkyGarden who have kindly helped us with supply of the green roof substrate and Gray & Jarrett who installed it. This is made up of a blend of recycled crushed brick and organic material, allowing for a free draining low nutrient and moisture retentive growing medium. The wildflower seed mix is to be planted towards the end of this week once the PV array is installed.

Another big thank you goes out to DVS who helped us with their fantastic triple glazed thermally broken rooflight. It saved a lot of heartache trying to detail a velux to be thermally efficient!

For those interested, the roof build up is as follows:

100mm – SkyGarden substrate weight – with riverstone perimeter (300mm width around parapet)
30mm – Sarnafil aquadrain plus – with protective fleece
———- Sarnafil G410 15EL (anthra grey) waterproofing membrane (including Sarnametal drip detail)
60mm – Kingspan thermaroof insulation
———- Sarnavap 5000 vapour barrier
18mm – WPB plywoood deck
varies – timber firrings (min 25mm) forming 1:80 fall – with full fill climatizer cellulose blown insulation
220mm – Steico structural zone with full fill climatizer cellulose blown insulation
11mm – OSB racking board- Air tightness layer (taped OSB using NBT Sicrall)
50mm – NBT Pavaflex timber fibre insulation
18mm – Plasterboard, scim and paint
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