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MicroHouse 4 Foundation

Form Plan

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Detailed Foundation Protocol 1

  1. Prepare materials: 2 hammers, measuring tape, laser level, 200’ of string, [13] 2”x10” boards, 14’ or longer; [8] 2”x4”s, 4’ or longer; [34] 2”x4”s, 2’; [200] 3” screws; 100’ of fence wire or rebar tie wire; [31] sticks of 20’ rebar; [16] rebar stakes, 2’ long
  2. Stretch a string across N part of MicroHouse 1-2 with 2 people, using rebar stake at each extremity, more than 13’ from NE edge of MH1, exactly 9.5” above gravel level. Gravel is at base of stem wall.
    1. Stretch another string exactly 12” to the S to mark the outer location of the first set of forms.
  3. Measure out South-East corner locations of foundation as 13’ away from the NE corner of MH1.
    • Set laser level for 1” above base of foundation.
    • Punch this in just below the 9.5” height mark such that the next cross string can go across it.
  4. Punch 2 stakes in, with the N stake more than 16’ away from the N edge of MH1 - to mark the W foundation form
    • Put in another 2 stakes to produce a string line exactly 12” E the last line
    • Verify that these string lines are perpendicular to MH1 body
  5. Run a set of stakes to mark the E boundary of MH1
  6. Put in a stake at 9” above gravel 16’ away from MH1 in W and E marked locations.
  7. Run 2 more lines to parallel the N side of MH1 - wall outer edge at 16 feet out
  8. Finally, mark location 13’ E of pink line with a 9” high stake for the far East edge of foundation, and mark a parallel line 1’ W of that.
    • Verify diagonals are equal on the E square.

This completes the full layout of foundation forms, from which point, foundation forms may now be put up with their cavities ½” below the string lines.

  • Make sure cavities are all 12” wide

MH 4

addition

corner post

MH1

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Detailed Foundation Protocol 2

  1. With all forms marked, cut up stakes out of 2x4s to which the form boards will be attached. Use one every 8 feet, with 3 on the 3 short sides.
    1. Need 34 (half shown to right), made from 3 foot 2x4’s cut diagonally
  2. Hammer enough of these in half way or so they can support the formwork
  3. Place the formwork in place, screw in stakes to formwork
  4. Use a scab made of 2x4s to hold adjacent forms in line
  5. Check that form work is ½” below the string lines, and cavity is exactly 12” wide.
  6. Punch in the stakes all the way in and screw in
    • To make sure the forms don’t shift or blow out, put gravel on the outside and inside of wood forms, and install rebar tension hangers fastened to 3” screws
    • Drill a ¼” hole to support a metal wire, use screws, and bend wire around screws to tension wire. This helps prevent form from blowing out:
  7. Hang rebar on the wire, and stub out 2’ for future expansion.
  8. Put in a 4’ and 8’placeholder for doors
    • Cut an 8’ board, and [2] 4’ boards (2”x12”)
    • 16’ from W edge for large door
    • Mid point for E and S walls

MH 4

addition

2”x4”

2’ long

18” long

MH1

16’ from W edge

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Detailed Foundation Protocol 3

Bathroom Concrete Pad Detail

Bathroom Framed Floor Detail

  1. Do cement pads for bathroom and stove
    • Use [2] 3’x3’ pads for stove
  2. Use 8’ pad for bathroom
  3. Concrete calculations:
    • Stem wall: 12”x9” high, 98’ long = 73.5 cu ft
    • Bathroom: 8’x15’x3” - 30 cu ft - $100 in concete + rebar
      1. TOTAL - 103.5 cu ft = 3.8 cu yd - get us 4.5 cu yd
  4. Then finally - vapor barrier + 3” of sand - which comes to 7.2 cu yd of sand

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3’x6’

8’ x15’

16’

13’

16’

53’

Ramset

Nails for wall

magnesium bull float

bathroom slab, 3”

gravel - 3”

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or 8’ x7’

3” space below brick layer

2x4 is taken out to create utility cavity

Framed Floor

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gravel - 6”

gravel - 6”