hygienic darkroom retreat

profound rest for the self‑healing psyche

by andrew durham

plan

hygienic house

…for healthy living and retreating
A design and budget
Updated 2022 04 08 10:00 UTC

design

conic


photo: conic hut

I built this small short conic hut (~3m diameter x 2.5m high) in 2008. It shows the shape and construction method. But the roof pitch is steeper than in the drawing. For use outdoors, roof pitch will be restored to the steeper angle of repose (~98°)

budget

ITEM TYPE ELEMENT COMPONENT PART MATERIAL SIZE mm AMT mm AMT ft UNIT ft QUANTITY COST/UNIT COST ESTIMATE NOTES
5 shell labor Chuck Henderson license+   -   - license 1 170 170.00 0.00  
10 shell roof skylight exterior conic polycarbonate 2 920x920 3 x 3 1^2 9 9 81.00 0.00 -
11 shell roof skylight tube ? see notes 460 dia, 560 h 1445 x 560h “57”” x 20”” “         40.00 MgO/paper/lexan
12 shell roof skylight interior window round glass unit 460 dia       1     50.00 MgO/paper/lexan
21 shell roof vent peak corrugated plastic 20 2680.00 “106””” 1.00 9     45.00 (92&52) * 4 - 20
22 shell roof roofing finish silicate paint - 15 @ 1220^2 240^2 1 gal/300^2 0.8 50 40.00 0.00 -
23 shell roof roofing finish silicate primer - 15 @ 1220^2 240^2 1 gal/300^2 0.8 25 20.00 0.00 -
24 shell roof roofing board, center MgO 3-6 1 @ 1220^2 1 @ 4^2 4 x 8 0.5 18 9.00 0.00 -
25 shell roof roofing board MgO 10 14 @ 1220^2 14 @ 4^2 4 x 8 7 30 210.00 0.00 -
26 shell roof roofing bolt zinc 5x40 - - 0.0145# @2.89 128 0.0419 5.36 0.00 4x40: $0.024565
27 shell roof roofing washer zinc 5x30 - - 0.0155# @2.89 256 0.0448 11.47 0.00  
30 shell roof roofing nut zinc 5 - - 0.0025# @2.89 128 0.0072 0.92 0.00 -
31 shell roof eave finish silicate paint - 14 @ 1220^2 224^2 1 gal/300^2 0.75 50 37.50 0.00  
32 shell roof eave finish silicate primer - 14 @ 1220^2 224^2 1 gal/300^2 0.75 25 18.75 0.00  
33 shell roof eave board MgO 10 14 @ 1220^2 14 @ 4^2 4 x 8 7 30 210.00 0.00  
34 shell roof eave bolt zinc 5x40 - - 0.0145# @2.89 160 0.0419 6.70 0.00  
35 shell roof eave washer zinc 5x30 - - 0.0155# @2.90 320 0.0448 14.34 0.00  
36 shell roof eave nut zinc 5 - - 0.0025# @2.89 160 0.0072 1.15 0.00  
40 shell roof fill air seal cardboard 4 1432 x 15 - - 20 0   0.00 456 dia
41 shell roof fill air barrier kraft paper - 17.75m^2 191^2 roll 300^2 0.64 19 12.16 0.00 X Paper/Longview
42 shell roof fill insulation cellulose - 3.64m^3 128.55^3 15.625^3 8.23 9.4 77.36 0.00 or straw, wood shavings, wood or cloth fiber
43 shell roof fill plaster form geotextile pro grade 10.51m^2 113.17^2 4 x 100 0.282925 38 10.75 0.00 -
44 shell roof fill plaster earth - 20.00 10^3 1^3 10 0.5 5.00 0.00 20-80 thick, 0.27-1.08m^3, $5-19 sand, clay, straw
45 shell roof fill plaster buster twine PP, 3 60m 210.00 20000.00 0.0105 25 0.26 0.00 -
50 shell roof ceiling nut zinc 5 0.00 - 0.0025# @2.89 103 0.0072 0.74 0.00 -
51 shell roof ceiling washer zinc 5x30 - - 0.0155# @2.91 206 0.0448 9.23 0.00  
52 shell roof ceiling bolt zinc 5x40 - - 0.0145# @2.89 103 0.0419 4.32 0.00 25*4+3
53 shell roof ceiling board, center MgO 3-6 1 @ 1220^2 1 @ 4^2 4 x 8 0.5 18 9.00 0.00 -
54 shell roof ceiling board MgO 10 10 @ 1220^2 10 @ 4^2 4 x 8 5 30 150.00 0.00 -
55 shell roof ceiling finish silicate primer - 11 @ 1220^2 176^2 1 gal/300^2 0.6 25 15.00 0.00 -
56 shell roof ceiling finish silicate paint - 11 @ 1220^2 176^2 1 gal/300^2 0.6 50 30.00 0.00 -
60 shell wall exterior finish silicate paint - 35.72 385^2 1 gal/300^2 1.28 50 64.00 0.00 -
61 shell wall exterior finish silicate primer - 35.72 385^2 1 gal/300^2 1.28 25 32.00 0.00 -
62 shell wall exterior board MgO 10 12 @1220 x 2440 12 @4 x 8 4 x 8 12 30 360.00 0.00 -
63 shell wall exterior bolt zinc 5x40 - - 0.0145# @2.89 247 0.0419 10.35 0.00 19*13
64 shell wall exterior washer zinc 5x30 - - 0.0155# @2.92 548 0.0448 24.55 0.00 -
65 shell wall exterior clips steel 3x25x40x40 62*80=4960 “1/8”“x1”“x16” 20.00 0.8 10.81 8.65 0.00 at roof only. Anchors at bottom
66 shell wall exterior nut zinc 5 - - 0.0025# @2.89 274 0.0072 1.97 0.00  
70 shell wall fill air barrier kraft paper, heavy? - 17.75m^2 191^2 roll 300^2 0.64 19 12.16 0.00 X Pape/Board/Longview
71 shell wall fill insulation cellulose - 5.78m^3 204.18^3 15.625^3 13.07 9.4 122.86 0.00 or straw, wood shavings, wood/cloth fiber
72 shell wall fill plaster form geotextile pro grade 21.89m^2 235.59^2 4 x 100 0.588975 38 22.38 0.00 2020 x 10835
73 shell wall fill plaster earth - 20.00 18^3 1^3 18 0.5 9.00 0.00 20-80 thick, 0.5-2m^3, $9-35 sand, clay, straw
74 shell wall fill plaster buster twine PP, 3 117m 383.00 20000.00 0.01915 25 0.48 0.00 -
80 shell wall interior finish silicate paint - 23.91 257^2 1 gal/300^2 0.86 50 43.00 0.00 -
81 shell wall interior finish silicate primer - 23.91 257^2 1 gal/300^2 0.86 25 21.50 0.00 -
82 shell wall interior board MgO 10 10 @ 1220 x 1960 10 @ 4 x 6-5 4 x 8 10 30 300.00 0.00 15 + 8 freight
83 shell wall interior bolt zinc 5x40 - - 0.0145# @2.89 183 0.0419 7.67 0.00 17*11-4 (for narrow door panel)
84 shell wall interior washer zinc 5x30 - - 0.0155# @2.93 366 0.0448 16.40 0.00 middle holes + opposite clips 12112
85 shell wall interior clips steel 3x25x40x40 106*80=8480 “1/8”“x1”“x28” 20.00 1.4 10.81 15.13 0.00 ceiling & floor
86 shell wall interior nut zinc 5 - - 0.0025# @2.89 183 0.004335 0.79 0.00 17*11-4
87 shell wall interior compression ring twine PP3 124m 406.00 20000.00 0.0203 25 0.51 0.00  
90 shell wall outer door body MgO 10 2 * 61 x 194   4 x 8 1 30 30.00 0.00 -
91 shell wall outer door handles, latch, bolt metal lever type - - - 1 1 1.00 0.00 -
92 shell wall outer door hinges metal 100 x 40 - - - 4 0.25 1.00 0.00 -
93 shell wall outer door shutter hardware metal -   1.00   1 5 5.00 0.00 -
94 shell wall outer door insulated glass unit 3/16 glass 46 x 81 x 25 - 18 x 32 x 1 - 2 65 130.00 0.00 -
95 shell wall outer door opening MgO 10 2*610 x 1960 3 x 8 4 x 8 1 30 30.00 0.00 2*30 x 194+61
100 shell wall inner door hardware metal         1 5 5.00 0.00  
101 shell wall inner door slot hardware metal         1 5 5.00 0.00  
103 shell wall inner door body MgO 10 2*610 x 1960 4 x 8 4 x 8 1 30 30.00 0.00 MgO total: +6, 19mm & 7, 3mm ?
110 shell wall window frame MgO/wood? 10/?             20.00 full-length in wall, facing south
111 shell wall window opening sides MgO 10 2 * 30x162/122 3 x 8 4 x 8 1 30 30.00 0.00  
112 shell wall window insulated glass unit 3/16 glass 46 x 81 x 25 - 20 x 32 x 1 - 4 65 260.00 0.00 glass: 4-5 , unit: 20
120 shell floor panel finish silicate paint - 15.2m^2 164^2 1 gal/300^2 0.55 50 27.50 0.00 -
121 shell floor panel finish silicate primer - 15.2m^2 164^2 2 gal/300^2 0.55 25 13.75 0.00 -
122 shell floor panel board MgO 19 11 @ 1220^2 11 @ 4^2 4 x 8 6 45 270.00 0.00 r220. Maybe 12 or 15 thick in future
123 shell floor frame screw zinc 4x75 - - 0.009804# @$5 104 0.0489 5.09 0.00 -
124 shell floor frame joist wood “2”” x 4””” 23120.00 76.00 1.00 76 1 76.00 0.00 “2 @8’, 6 @10’. Maybe 2”” x 2”” with MgO vertical beam or 1”” or 2”” x 6”””
125 shell floor frame tongue MgO 10 1.39m^2 4 x 4 4 x 8 0.5 30 15.00 0.00 60x(~11516, 654, 25*4)
126 shell floor frame screw zinc 4x30 - - 0.003448# @$5 104 0.0172 1.79 0.00 -
127 shell floor fill insulation cellulose - 1.63m^3 57.56^3 15.63 3.68 9.4 34.59 0.00 or straw, wood/cloth shavings/fiber; water tolerant bottom layer, 15-25
128 shell floor fill border kraft paper - 110x13823 1.52m^2 16.37ft^2 roll 300^2 0.055 19 1.05 0.00 X Paper/Longview
130 shell floor suspension post wood 132x38x38 5*132=660 “5”“x2”“x2””” 1.00 2.16 0   0.00 use scrap
129 shell floor suspension strap steel or static fiber 30 17800.00 60.00 1.00 0.1 60 6.00 0.00 From scrap yard or steel pallet strapping at steel supply
140 shell floor sheathing bolt zinc 4x20 - - 0.0051# @2.89 109 0.01474 1.61 0.00 -
141 shell floor sheathing washer zinc 4x20 - - 0.00465# @2.89 218 0.01344 2.93 0.00 -
142 shell floor sheathing nut zinc 4 - - 0.0015# @2.89 109 0.004335 0.47 0.00 -
143 shell floor sheathing board MgO 3-10 12 @ 1220^2 12 @ 4^2 4 x 8 6 12 72.00 0.00 against animals, insects, weeds
144 shell floor exterior screen, bug geotextile pro grade 2.12m^2 22.78^2 4 x 100 0.05695 38 2.16 0.00  
145 shell floor exterior screen, animal steel “1/4”” mesh” 2.12m^2 22.78^2 3 x 50’ 0.151867 100 15.19 0.00 metal drainage screen to outside of ext wall
150 shell floor pillar block wood 80x80x64       4 0   0.00 salvage from pallet
151 shell floor pillar plate MgO 19 80 x 80 *21 1.50   21 0   0.00 use scraps
152 shell floor pillar Vibration absorber sorbothane 6-10 540 x 630 4.00 ?       100.00 21290*90 Alibaba. Springs?
153 shell floor pillar round screw zinc 4x12 - - 0.00346# @2.89 168 0.01 1.68 0.00 2142^2
154 shell floor pillar washer zinc 4x20 - - 0.00465# @2.89 336 0.01344 4.52 0.00 -
155 shell foundation   pier stone 50x150x150 -     13 1 13.00 0.00 no concrete
156 shell foundation   pier stone 50x300x300 -     8 2 16.00 0.00 no concrete
160 shell foundation tripod anchor hook rebar/cold 12x400 6 * 400 = 2400 8.00 20’ 0.4 21.75 8.70 0.00 Rebar, $14/20’
161 shell foundation tripod anchor wire steel 3         0.1   0.00 -
162 shell foundation tripod anchor pod rebar/cold 12x1200 6 * 3 * 1200 =21600 71.00 20’ 3.55 21.75 77.21 0.00 weld crossbar near top for wire. Sharpen ends. Harden?
201 furnishings bathroom shower curtain plastic sheet               5.00 -
202 furnishings bathroom shower pan galv. steel 29GA 1220 x 1320   3200.00 0.4125 46.8 19.31 0.00 90 x 100, 15 wall, 1 fold,
203 furnishings bathroom shower plumbing                 20.00 -
204 furnishings bathroom toilet bucket                 5.00 2, 4, or 5 gal/10 or 20L
205 furnishings bathroom toilet top MgO 19?             15.00 -
206 furnishings bathroom toilet funnel                 1.00 -
207 furnishings bathroom toilet screws / magnets                 10.00 -
210 furnishings furniture bed mattress foam               100.00 -
211 furnishings furniture bed frame wood               50.00 -
213 furnishings furniture bed rubber bike tire tubes - ? - - 10 0   0.00 -
214 furnishings furniture bed screws zinc               10.00 -
220 furnishings furniture chair screws zinc               3.00 -
221 furnishings furniture chair frame wood               5.00 -
222 furnishings furniture rugs - natural fiber 1m^2 - - - 3 10 30.00 0.00 counter, entry, bed
230 furnishings furniture counter finish silicate paint               10.00 basically, a shelf
230 furnishings furniture counter finish silicate primer               10.00 -
232 furnishings furniture counter top, sides, shelves MgO 10-19   4 x 8 4 x 8 1 30 30.00 0.00 4400 x 1200, 2400 x 1000
233 furnishings furniture counter screws zinc               5.00 lights, battery, USB, etc
234 furnishings furniture counter dish tub plastic               5.00 -
240 furnishings furniture shelf body MgO 10 1750x1200 4 x 6 4 x 6 0.75 30 22.50 0.00 60 x 30 x 100: 2100x30, 100x60, 560x30 700x30/175x120
241 furnishings furniture shelf screws zinc               5.00 -
250 furnishings furniture table top MgO 10 1220^2 4 x 4 4 x 8 0.5 30 15.00 0.00 -
251 furnishings furniture table screws zinc               5.00 electric
252 furnishings furniture table legs wood               10.00 -
300 utility aeration HRA box MgO 10 50x25*2 “2*20”” x 10””” 4 x 8 0 30   0.00 use scraps
301 utility aeration HRA fans                 30.00 -
302 utility aeration HRA FiWiHex core                 200.00 HRA: Heat Recovery Aerator (Commonly misnamed HRVentilator)
303 utility aeration HRA fan mount                 5.00 -
304 utility aeration HRA wire, controls                 40.00 -
305 utility aeration vent, high Air vent                 10.00 -
306 utility aeration vent, low Air vent                 10.00 -
310 utility electricity AC extension cable                 30.00 -
311 utility electricity AC wall tube                 5.00 -
312 utility electricity DC AC inverter - ~200W - - - 1     100.00 -
315 utility electricity DC outlets                 50.00 -
316 utility electricity DC solar                 200.00 -
320 utility food cooler   MgO/ceramic?               60.00 evaporative, of ceramic or MgO
321 utility food   teapot electric               20.00 for hydronic tubing in floor
322 utility food   hotplate electric               0.00  
330 utility compost bin wall, lid wood/wire 1m dia, 3500.00 11-8 1.00       10.00 -
331 utility compost bin, duff wall, lid                 5.00 -
340 utility warmth ground cooling tubing                 20.00 -
341 utility warmth AC heater   - ~1000W - - - 1     40.00 -
342 utility warmth Off-grid heater                   200.00 solar/propane/electric
343 utility warmth heating hydronic tubing pex 7-10 14306 * 5 + 50000 300.00 100 coil 3 30 90.00 0.00 9306+5000 connection/manifold
350 utility water supply rainwater tubing               50.00 at one outlet, away from bed, remote breaker with cord
351 utility water supply barrels steel 200L - - - 4     40.00 gravity fed
352 utility water supply filter                 20.00 -
353 utility water supply tubing 6-10mm                 40.00 -
360 utility water return indoor drain pipes                 5.00 -
361 utility water return greywater                 10.00 -
362 utility water drainage low earth walls           1 0   0.00 -
410 condition labor Andrew Durham tool       - - 10 20   200.00  
411 condition labor Andrew Durham stipend shelter -     month 125 4   500.00  
412 condition labor Andrew Durham stipend food, etc -     month 275 4   1100.00  
420 condition labor Andrew Durham equity wage   17 weeks 20hrs/week hour 340 20   5200.00 equity: wage minus stipend
430 condition labor George Swanson consultation knowledge   one-time cost   hour 3 200 600.00    
431 condition labor Building Biology E-book Breathing Walls - one-time cost - file 1 30 30.00    
                             
        MAIN SHELL           RUNNING        
        MATERIALS   COST ESTIMATE COST + EST. * +20% * TOTAL        
        MgO board   1792.50 15.00 1807.50 2169.00 2169.00        
        finish   363.00 20.00 383.00 459.60 2628.60        
        fasteners   134.04 28.00 162.04 194.45 2823.05        
        insulation   234.81 0.00 234.81 281.77 3104.82        
        windows   390.00 0.00 390.00 468.00 3572.82        
                             
                    RUNNING        
        TYPES, etc   COST ESTIMATE COST + EST. * +20% * TOTAL        
        Shell   4111.97 306.00 4417.97 5301.57 5301.57        
        Furnishings   140.17 328.80 468.97 562.76 5864.33        
        Utility   108.00 1440.00 1548.00 1857.60 7721.93        
        Consultation one time 630.00   630.00 630.00 8351.93        
        Stipend, Tools     1800.00 1800.00 1800.00 10151.93        
        Equity     5200.00 5200.00 5200.00 15351.93        
Notes

v.3.1 Noticed 20% was not added to materials. Corrected. Bid increased to $15,352

v.3 Massive increase in bid: doubled to $14k

  • Equity (wages) added
  • Work period doubled to 4 months to include all TYPES, phases, and prototyping delays
  • Stipend
    • increased by 1/3 to cover all personal expenses (see sane personal economy)
    • extended for new work period
  • MATERIAL costs padded by 20%. Usual 10% for breakage and error plus 10% in case of more insane price increases
  • Estimate of license doubled, built into shell cost I hope actual cost will be lower. I will track time, purchases, personal expenses to find savings.

v.2 Totals added at bottom for main categories and materials

v.1 I found COSTS of nearly all main materials. Figures for many minor materials are ESTIMATES. I made the estimates halfway through getting prices. Some were way off. But the total was close. So I expect the final budget to be close to the above figures.

All the prices are for new materials except door and window hardware. Hinges and latches are cheap and plentiful at Habitat for Humanity ReStores. There is also opportunity in the design for economizing with used and found materials.

The drawing is nice, of course. But prototyping is a process of constant invention. Some of the budget is impossible to figure out until afterward. Like the time aspect. 4 months to build is very rough and only applicable to prototype.

I would like to prototype the house this summer and make more by winter. Then folks can retreat in them instead of renting (eg, in Oregon). They just need a place they can go up for a few months. Inside barns, garages, sheds, warehouses or workshops would be good until we can get the legal aspect of this settled. At least in a thick stand of trees.

One bottleneck is the 10-week wait for the magnesium oxide board. The sooner that order is placed, the sooner the building can take shape. Some things can be fabricated beforehand.

If you want to talk to me about any of this, write or call for phone appointment.

Cheers,
Andrew

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