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Saturday 11th 36-39F, heavily overcast cold, grey and damp. Some brief, golden sunshine in the mid-afternoon.
I spent the morning in the new dome. I had been struggling to get the shutters to close together. When I measured the distance across the dome's original, arched doorway, at ground level, the gap was 8" too much! The shutters were also 10cm too low above the base ring. So that the shutters were not concentric with the dome.
All my shelf brackets had been fixed with a deliberate drainage gap behind the base ring. To let internal condensation pass unhindered down to the skirt. Which would hopefully, allow it to drip off. Rather than puddling on the base ring.
Today I fitted some angle brackets to some of the shelf bracket fixing bolts. Then tensioned ratchet straps between them across various chords of the dome. Eventually the gap behind the base ring shrank. The gap across the doorway was now down to within 10cm of the original measurement. 292cm instead of the required 282cm.
I had to the loosen the fixing bolts to ease the shelf brackets upwards after removing the fixing screws. The problem seems to be the base ring being too close above the dome's moulded, reinforcing ring. Which runs around, just above the skirt. Th GRP moulding had lifted the base ring and pushed it inwards. Preventing the ring from touching the inside of the dome. Consequently the dome was forced outwards. Making it larger than the outer, cut radius of the plywood base ring.
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