Part 9 - Roof finished
Having fitted sarking boards and roofing membrane, the next task for the joiners was to batten out the roof ready for tiling, and forming timber 'skews'.
'Skews' are a verge treatment seen widely throughout Orkney, be they lead covered, stone or formed from concrete.
Nothing especially complicated in their construction, as can be seen in the 'technical diagram' used by the joiners:
With no external block leaf, our options were a bit limited in terms of construction, but the cantilever design is strongly anchored, bolted as it is to the concrete core of the ICF block, and to a timber (also bolted into the concrete core) that runs under the cantilever. The overhang will be significantly reduced as and when the additional EWI is fitted and cladding / render has been applied.
Lead work next. A lot of lead required, 13 rolls of 390mm, 10 rolls of 600mm for the skews and valleys combined. Those of you who know the price of lead will appreciate the costs involved!
The lead valleys were done first, 3 rolls of 390mm used:
followed by a couple of days folding lead for the 'skews'. Two pieces were used to form the finish, the first being the 'soaker', which formers the gutter between the edge of the tiles and the 'skew' itself. The soaker profile, formed from 390mm lead (7 rolls used for the house, 3 left for the garage):
The skew profile, formed from 600mm lead (7 rolls used for the house skews, 3 rolls left for the garage) :
and how the two profiles fit together:
And finally, how they look when complete:
As you can see, to facilitate expansion, the skew is made up of overlapping pieces of lead rather than a single strip.
Having completed the lead work, 5 days of it - 1 for the valleys, 1 day each per gable skew and soaker, the plumber handed over to the tiler. Working alone, he covered the roof with a flat profile concrete tile in 2 weeks. Because of the wind up here, every tile is double nailed and clipped. Black Soudal roofing sealant was used at valley / soaker junctions to secure any tiles that had been cut. Where tile meets lead, the folded edge of the soaker / valley lead was pulled up to the underside of the tile to prevent water (and bird) ingress.
We now have a finished roof, which I have to say looks great. We are really pleased with the skews and the huge difference they make to the overall finished roof appearance.
Unfortunately, we are still waiting for our windows, so will not be fully water tight for another 3 - 4 weeks. Work will however continue on site, with a reasonable list of jobs that can be progressed while we wait - building the garage, fitting EWI, fitting fascia and soffit boards, dwanging and battening inside etc.
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