This is the sarking folded down over the ends and side. If I were to do it really well I would have folded it further down the ends
This shows with the top 2 roof panels removed. The brushable tar (been a bit sloppy) is to cover the staples to stop them rusting and to seal the screws.
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Showing inside. The white stuff is silicone sealer which I originally used.
For those who don’t know what sarking is. Basically, two sheets of aluminium sandwiching a woven poly layer and another poly layer. Can be cut with scissors or knife and shaped.
Always an augment as to whether the blue side out or in. Best way to decide is by climate. In hot areas shiny side up to reflect heat, cooler climes shiny side down to reflect heat back inside.