Advice on forms and screeding for concrete

millsy

I plan to lay some concrete. Once set I'll be putting up a fence on either side. The fence will run along the red line in the pic and also along where the timber is.

bins sub base 1.jpg

For the fence posts I'll be using bolt down shoes.

Looking for advice on the yellow line in the pic. I had planned to create the form using timber where the existing one in the pic is, as well as where the yellow and red lines are. Then I realised that if I want the fence right against the wall at the back I can't have that timber (yellow line) there because the there would be empty space left when I remove the form. And with the shoes I'd need to have them in a bit from the edge of the concrete too. If I don't have the yellow line timber there then I'm not sure how easy it will be to screed the concrete. There's a fall from right to left which I want to maintain for rainwater drainage, and I had planned to run the screed board along the yellow line and path (at the bottom of the pic). So the screeding would be done from right to left and not top to bottom.

Should I remove the ends of the yellow line so there is empty space where I want to put the shoes, and screw the yellow line to the wall?

10-10-20

I think it's a simple enough decision - pull the back board. If you want to keep the concrete off the wall just run a layer of DPC or plastic along the wall and cut it once done. It cuts out having to hoik out weeds later down the line anyway.

millsy

https://www.boards.ie/discussion/comment/123963972#Comment_123963972

No I don't want to keep the concrete off the wall. I want to do the opposite. I want the concrete going all the way to the wall so that I can bolt the post shoes as close as possible to the wall. But from my very limited experience with pouring concrete I think it would be easier to screed from high (right side) to low (left side), so I think I'll need that timber along the wall.

10-10-20

Screeding length-ways is going to be trickier anyways and it's going to be tougher to screed up against the rear wall as you don't have much 'purchase' on the back board to allow the required movement of the screed. I'd just screed it by running the screed along the longer sides. It's small enough and you should be able to lean over most of it that way.