OBI Model 1 Tech Due Diligence
Seed Eco-Home Features
Seed Eco-Home Module - 16x16. Off Grid on Electric and Sewer. Hookup: requires a water source only. Options: this can be all normal: no CEB, connect to sewer, and connect to electric. Expandable to any size from this core utility module.
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Features: Initial
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Industry Standard Cost
$150/sf
OBI Material Cost - Core 225 sf module
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Roof - [6] $180 per 16x3 double module = $1080
[1] ½-module for overhang = $100
[1] ladder module for overhang - $100
Foundation - [1] truck of gravel = $350
[2 cu yd] concrete = $216 (minimum). 60 lb bags - $2.25. 96 needed for 8” foundation. $216. Or lime concrete next - lime, sand, gravel
[8] form boards = $130,(not reused as top plate. Could use 2x6 with dig-down.
[8] ½” rebar, 16’ = $40
[10] EPS, 2” = $160
[1] roll tar paper = $25
[flashing] - 144sf @ $0.65=$94
Floor - [200] floor CEBs @$1 = $200 (cf $5.49*48 = $264 for wood + stringers -[5] 2x6x16 ripped into 2 = $55)
[6] 10 ga remesh = $30
[1] 6 mil poly barrier - $10
[1] Sealer/ joint stabikizer for CEB - $144
[8] EPS, 2” = $130
[1] roll PEX tubing, 250’ = $100
[1] box screws - $60
Walls - [14] each: [2] plywood = $30 => $420
[5] 2x6 = $25 => $350
[1] insulation = $10 => $140
[32] seams, inc interior @$1.7 = $53
[1] box screws = $60
[1] bucket of paint = $100
[400] CEBs for 2 sections= $400
[1] door = $269*
[3] windows = $500*
PV - [15] x 190W @$78 = 2.9 kW - 81x158 cm = 32”x62” = $1170 (2.8y payback)
[3] 1 kW grid Tie Inverters = $315
[4] small battery pack, $180 (not needed if intertie)
[1] breaker box = $20
[500’ wire + outlets] = $100
$6704 Total w/ PVno tax or ship,
And does not include equipment rental (bobcat for leveling foundation)
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$1280
$1015
$674
$2239
$1500
Shower - $300
Sink - $200 (wall module) - $65 per wall module, or $260 per house side!
Toilet with Bioagas Digester - $500 - needs detailing
Stove - $500 - needs detailing
Hydronic Panel - $500
Pellet Burner - $350 - needs detailing
Superefficient Fridge - $300
Cook Top - $200
TEG Generator - $250 - needs detailing
Plumbing - 200
Drain pit - $300
Hot water from pellet stove - $200
$4600 Total (Total: $11300. $700 in other supplies and contingencies, tax, shipping, inventory, consumables, tool depreciation)
Package Summary: Seed Home with 3kW PV, CEB Floor + 2 wall sections, in-floor hydronics, TEG co-gen, biodigester providing cooking gas, superefficient fridge. Eco-features: off grid on ample electricity, cooking gas, and toilet.
OBI Material Cost - Additional 225 sf module
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Roof - [5.3] $180 per 16x3 module = $954
[1] ½-module for overhang = $100
[1] ladder module for overhang - $100
Foundation - [2/3] truck of gravel = $250
[1.5 cu yd] concrete = $160 (minimum)
[6] form boards = $100,(not reused as top plate. Could use 2x6 with dig-down.
[6] ½” rebar, 16’ = $30
[5] EPS, 2” = $80
[1/2] roll tar paper = $13
[flashing] - 108sf @ $0.65=$75
Floor - [200] floor CEBs @$1 = $200
[6] 10 ga remesh = $30
[1] 6 mil poly barrier - $10
[8] EPS, 2” = $130
[1] roll PEX tubing, 250’ = $100
[1] box screws - $30
Walls - [10] each: [2] plywood = $30 => $300
[5] 2x6 = $25 => $250
[1] insulation = $10 => $100
[24] seams $1.7 = $41
[1] box screws = $60
[3/4] bucket of paint = $75
[400] CEBs for 2 sections= $400
[1] door = $269*
[2] windows = $330*
PV - [5] x 190W @$78 = .6 kW increment = 32”x62” = $390
[1] 1 kW grid Tie Inverters = $105
[1] breaker box = $20
[250’ wire + outlets] = $75
$4800 Total with PV
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*Same as MH4.
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$1154
$708
$500
$1810
$595
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Package Summary: House addition (no kitchen/bath) with 600W PV increment, CEB Floor + 2 walls.
For 1400 sf with 1 core module and 5 additional modules, material cost is $25/sf.
Build Time - 225 sf. 3 days with 12 people=300 hr
Roof - [12] 16x3 module - each takes 3 person hours = 36 hours
[1] ½-module for overhang = 3 hours
[1] ladder module for overhang - 3 hours
Roof Install - [12] 20 minutes per section - 4 hours
Foundation - [1] grading + gravel = 8 hr
[2 cu yd] concrete = 4 hrs
[8] form boards = 8 hours
[1] EPS + tar paper = 4 hrs
[1] flashing = 4 hrs
[1] take off forms = 2 hrs
Floor - [1] floor CEBs = 16 hrs
[1] insulation + vaporguard + rebar mesh = 8 hrs
[1] roll PEX tubing, 250’ = 4 hrs
[1] sand - dump + smooth - 2 hrs
Walls - [14] each = 14 hrs
[32] seams = 4 hrs
[1] bucket of paint = 4 hrs
[400] CEBs for 2 sections= 4 hrs
[1] door = $269* = 2 hrs
[3] windows = $500* = 6 hrs
Solar Panels - [1] Solar panels = 8 hrs
[1] Electrical Box = 4 hrs
[1] Wiring = 4 hrs
156 hr Struct. w/ PV
Shower = 4 hrs
Sink = 4 hrs
PV Incinerating Toilet - 16 hrs
Hydronic Panel - 4 hrs
Stove - 8 hrs
Pellet Burner - 8 hrs
Superefficient Fridge - 2 hrs
Cook Top - 1 hr
TEG Generator - 8 hrs
Plumbing - 4 hrs
Drain pit - 4 hrs
Hot water from pellet stove - 2 hrs
65 hr Utilities
221 hr Total
X25 = $5525 if labor were outsourced. With labor -
$75/sf for core module
Lean Package - 780W PV. No hydronic heat.
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Roof - [6] $180 per 16x3 double module = $1080
[1] ½-module for overhang = $100
[1] ladder module for overhang - $100
Foundation - [1] truck of gravel = $350
[2 cu yd] concrete = $216 (minimum).
[8] form boards = $130,(not reused as top plate. Could use 2x6 with dig-down.
[8] ½” rebar, 16’ = $40
[10] EPS, 2” = $160
[1] roll tar paper = $25
[flashing] - 144sf @ $0.65=$94
Floor - [3] 2x6x16 ripped into 3 stringers = $33 -
[1] wood floor - $5.49*48 = $264
[1] 6 mil poly barrier - $10
[8] EPS, 2” = $130
[8] sheets ⅝” osb - $104 + vinyl tile $140 for 210 sf - makes no sense compared to plank wood floor
[1] box screws= $20
Walls - [16] $65each = $1040
[32] seams, inc interior @$1.7 = $53
[1] box screws = $60
[1] bucket of paint = $100
[1] door = $50 - Restore
[3] windows = $120 - Restore
PV - [4] x 190W @$78, 760W = $312
[1] 1 kW grid Tie Inverter = $105
[1] breaker box = $20
[500’ wire + outlets] = $100
$4708 Total w/ PVno tax or ship
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*Same as MH4.
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$1280
$1010
$458
$1423
$537
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Shower - $300
Sink - $200 (wall module) - $65 per wall module, or $260 per house side!
Toilet with Biogas Digester - $500
Heating Stove - $359
Superefficient Fridge - $250
Cook Top - $200
Plumbing - $200
Drain pit - $300
Hot water heater - $269
$2578 Total (Total: $7286)
Package Summary: 780W PV, wood floor, no CEB, regular stove (no hydronics or TEG). Eco-features: biogas digester + Superefficient fridge. Off grid on electricity, cooking gas, and toilet.
Lean Addition - no PV, interior door, no CEB, but still PEX
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Roof - [5.3] $180 per 16x3 module = $954
[1] ½-module for overhang = $100
[1] ladder module for overhang - $100
Foundation - [2/3] truck of gravel = $250
[1.5 cu yd] concrete = $160
[6] form boards = $100,(not reused as top plate. Could use 2x6 with dig-down.
[6] ½” rebar, 16’ = $30
[5] EPS, 2” = $80
[1/2] roll tar paper = $13
[flashing] - 108sf @ $0.65=$75
Floor - [3] 2x6x16 ripped into 3 stringers = $33 -
[1] wood floor - $5.49*48 = $264
[1] 6 mil poly barrier - $10
[8] EPS, 2” = $130
[1] roll PEX tubing, 250’ = $100
[1] box screws - $30
Walls - [12] each: [2] plywood = $30 => $360
[5] 2x6 = $25 => $300
[1] insulation = $10 => $120
[24] seams $1.7 = $41
[1] box screws = $60
[3/4] bucket of paint = $75
[1] interior door = $100*
[2] windows = $330*
[1] breaker box = $20
[250’ wire + outlets] = $75
$3910 Total
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*Same as MH4.
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$1154
$708
$567
$1386
$95
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Package Summary: Simple addition. No PV, wood floor, no CEB, no kitchen/bathroom.
Industry Standards - Separating Toilets
Types of toilets (device for disposing 2 excreta):
Types of toilets (device for disposing 2 excreta):
Compact Composting
Incinerating Toilets
ecojohn