Last time, we talked about the Ibstock tile bricks we have used for the side walls at an extension in South London. Since those walls have been constructed, we have continued to progress with work and have been building the back wall of the house, as well as beginning to construct the roof.

The first step was to build the external back walls that are topped with a wall plate that supports the timber lintel. Often we will use steel and, on this occasion, the drawings specify timber. In fact we have used two pieces of timber, bolted together, and with a dog tooth connector between the timbers to create the lintel. The following photos show the external walls, beam bolted up, a dog tooth connector between the timbers and the wall plate that the timber lintel sits on.

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The next step was to put in the drainage that sits in the cavity wall and connects with a gulley on the flat roof to allow water to drain off the roof.

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We used this sample piece of the cill for the new doors to work out the floor and patio heights.

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Next, we began constructing the roof. The following photos show the roof timbers and the space where the velux windows will sit.

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The roof is being covered with a Bauder roof system, a specialist felt and then sedum. This is low maintenance planting that provides excellent cover and increased protection to the waterproofing system. The plants are grown on a ‘blanket’ that is harvested like turf and installed by rolling out on top of the waterproofing. The blankets are very lightweight, easy to maintain and provide instant greening to the roof.

The final photos show how the back walls are looking now. After the block work was built, we covered it with air guard and then constructed the stud wall that we filled with celotex, and finally wrapped it with a breathable material. We will be building vertical batons, followed by horizontal batons, that will support the vertical external cedar cladding.

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