So how do I know what size these pieces will be? First, measure the area which needs to be covered - see the last update for what it used to look like. Then draw it on paper, to scale - I measured in centimetres so 100cm becomes 100mm on paper. Then divide it into 3 strips, remembering that each strip has to overlap the next one AND has to overlap the side of the shed too. Mine overlap each other by 20cm, and at the sides it's 20cm too (15cm fascia + 5cm to tuck it under). Draw that onto the paper. Then measure what you have on the paper and transfer that to the underlay, cut it out and you're done. I managed to get the two pieces I stuck on today from the pieces I had left from the rolls used for the back of the roof, so there has been very little wasted.
To roll the strips on I folded them over the left-hand side and stuck the folded part to the fascia, then unpeeled the rest of the backing and pushed the underlay on gradually (to avoid bubbles), and once on banged it down hard with my palms, then gave it a once-over with a soft sweeping brush, just to make sure it's all stuck down. The pieces attached to the fascia never stick for some reason, so I nail them with 30mm clout nails underneath, where the nails can't be seen.
Just the strip at the top to do now, and that could be a problem - although I can get to it from the side, and above it using the scaffolding, the scaffolding doesn't go all the way across and I can't reach that far. If you look hard at the ridge you'll see a white flappy bit which is the felt from the back roof overlapping, which was too out of reach for me to trim off (about 3 feet from the left, a 3-foot section). Your guess is as good as mine as to how I'm going to tackle that one, but it's sure to involve extreme danger!
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