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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.

  1. Planed
  2. Sawn Untreated
  3. Sawn Treated
  4. Carcassing

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.

enter image description here

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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.

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