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Roof Insulation and Lining.
Finally got around to finishing off the inside of the shed roof. Although I had retro fitted some insulation in between the rafters there was still room for improvement and I experimented with some ply and my infrared temperature gun and found I could get better results with the second air gap.
In in the end I opted for a product called Foilboard which is essentially polystyrene foam with a thin layer of aluminium on either side. After a chat with their rep I went for the 20mm thick boards. This gives an extra R value of 2 on top of the existing insulation.
The pros for me are that at 20mm the boards are rigid enough to span the 750mm rafters without sagging, they are very light and easily handled, cut and installed by one person and doesn’t impose any worthwhile loading to the rafters, they give good insulation from the roof heat and exceptional light reflection within the shed. Additionally it is non toxic and flame retardant.
The cons are, it will damage fairly easily as the aluminium is very thin, cutting it makes a mess even with the recommended knife cut and snap, I found it easier and more accurate using an old fine tooth pull saw and a rasp for smoothing edges which didn’t help the mess. I found it was best to use disposable gloves to keep sweaty oily hand prints off the surface.
Initially I started out using the recommended foil board fasteners, I went with the blank plates and screwing into the predrilled hardwood. After a few sheets though it didn’t look that great, so I replaced them with 25mm mudguard washers and 8g countersunk screws for a flusher finish. I used the foilboard aluminium joining tape on the horizontal joins only as the vertical joins had rafters behind them. I was lucky that the rafter length to the walls were just under 1.8m and the sheets 1.2m wide so I was able get away with very little wastage. Ended up using 10 sheets on a 7.2 x 3.6 shed with 3 usable pieces totalling about half a sheet if I ever need them for repairs.
Overall I’m very happy with the result, light reflection is great, life is now more comfortable temperature wise in the shed and it looks ok as well, so I thought I would pass on my experiences for others.
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