I bought some wood to replace a gutter board from my local timber merchant last weekend. They recommended treated wood, but it's only planned and it's full of knots, so I've got to mess about sanding it & treating the knots. Also it's 20mm thick & seems pretty heavy to hold something as light as a short run of plastic gutter. Then, when I got it home I realised that it's bowed, so needs to go back anyway.
What kind of wood should you use for a board to hold a gutter? Does it have to be treated? It needs to be 4 metres long & when I looked in Homebase & B&Q the longest that they had was 3 metres (sanded & very few knots, but untreated) and having to join 2 bits seems a bit messy. Would untreated pine be OK once it's painted?
Basically I'm wondering what people normally use.
Regards,
Michael