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What type of timber would you use to construct the formwork (shuttering). There seems to be 4 different types that I could use.
My particular project is for a garage slab that will have a 100 mm sub-base with 100 mm of concrete ontop e.g. The image below shows the sub-base and the proposed formwork.
Pine, sawn untreated.
Pine - most typical for structure civil works, doesn't need to have some better grades or something. It's just for formwork after all...
Sawn untreated - concrete doesn't care, so You shouldn't also. These planks will serve as another formwork or to feed some furnace.
