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Layout and Marking Base Plates

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Building Addition Walls - INSANE Backyard Pt 5

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What happens here

To establish the precise location of the walls, measure 6 inches off the edge of the existing concrete slab on both sides (adjacent to the house and at the outer perimeter). These measurements are used to ensure the new walls will be parallel. If there are minor discrepancies from the initial concrete formwork (e.g., 3/8 inch off), split the difference (e.g., 3/16 inch) to maintain symmetry. Once precise points are marked, use a chalk line to snap straight lines across the concrete, which will guide the placement of the bottom plates. Also, verify diagonal measurements to ensure the layout is perfectly square.

Goal: Accurately mark the wall perimeter on the concrete slab.

Tools and materials

  • Marker — Making temporary marks on the concrete
  • Measuring Tape — Taking precise measurements for wall placement and checking squareness
  • Tajima Chalk Line Tajima — Snapping straight lines on the concrete slab
  • Concrete Slab N/A — The working surface for layout

What they say

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plates for all of our walls so what we did was just pull six inches off of our slab on both sides by the house and out at the edge here and we made that measurement between the two marks to make sure that we are perfectly parallel we knew that we're really close with our forms here but we have some wiggle room because we have a two and a half inch facade that's going on here with inch and a half battens and then one inch thick deck material we were three eighths off of our measurement here so what we had to do was just split the difference three sixteenths off that's why we have two marks here but now we're good we can snap those lines we'll check for square then we can start laying out our bottom plates is this the tajima where did you get this chalk line keep it above keep it off the let me pull tight all right go down yeah i'm good is this a tajima we're gonna measure we're just gonna measure the same distance off we'll snap that line yeah and we'll make sure we're square uh measure off six inches again good [Music] i'm like 3 16 off really close all right so it gets greater the number is greater yeah so if anything that corners got to go in a little bit yeah but just like on the other side of the chalk line i mean i could live with that yeah that's not bad

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