The distance from the bottom edge of the 2 by 6 or 8 to the bottom of the u notch will be 2.
Screeding concrete against a wall.
Use any 2x4 that overlaps the forms by at least 6 in but make sure it s straight photo 1.
Take a 2 x 2 and tack it to the wall 2 above the grade of the finished concrete.
Now cut a u shaped notch on the end of a 2 x 6 or 2 x 8 to accept the 2 x 2.
This can usually be accomplished by some diyers on a small scale like a sidewalk for example.
It must be completed before excess bleedwater appears on the surface.
Follow screeding immediately with the darby photo 2.
This process removes excess concrete and brings the top surface of the concrete to proper grade.
Screeding when done properly will leave you with a good even flat surface free of humps bumps holes and low spots.
Work your way downhill if applicable drawing excess concrete into low spots and holes.
When you re hand screeding use a sawing motion across the guides as you creep forward along the guides.
Straightedges are used to strikeoff or screed the concrete.
Your goal is to level out marks and fill small holes left by screeding.
Screeding concrete is one of the first steps in placing and finishing concrete.
Screeding is the art of skimming or striking off the surface of the concrete after rough raking it.