A pond liner on the shed roof is an odd thing. Why not use roofing felt or tiles? "I have a cunning plan, my lord". The roof is going to be a garden. The shed roof is flat with small fall towards one side. Three sides have a 3 inch [75mm] border which creates the well. I will be filling the well with soil and planting low growing, low maintenance plants such as Thymes and alpines. These plants can stand extremes of weather. So now you know why there is a pond liner on my shed roof. I dropped lucky with the cost of the liner which I got for just over £10 when it should have been four times the price.
My shed has a purpose besides providing a home for Spiders. I am to fill the space between the joists on the underside of the roof with insulation. This will give me a roof 10inch [250mm] thick. This will have an excellent "U" value. (U value being the measurement of thermal loss). Together with the thick walls, some of which are backed by earth, will provide a cool room, a root cellar in American parlance. I should be able to store all my allotment produce for longer, cool in the summer and frost free in the winter. Currently the garage is used but it responds to the outside temperature too quickly and is not light proof. The humidity in the garage is random, up one day, down the next. It does not help that the laundry is in the garage as well which adds to the temperature and humidity fluctuations. Tonight I hope to fit the lower vent pipe in readiness planking the external frame at the weekend, weather permitting!!
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