Building Small Greenhouses

8/12/2019 Building Small Greenhouses

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Building Small

Greenhouses


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Many home gardeners find a small greenhouse arelaxi:tg hobby as well as very useful. It can beused to root cuttings andsminate seeds for theoutdoor garden, special flowers or ornamental5 canbe raised, and vegetables can be grown out ofseason. A carefully chosen and attractive green-house can provide many hours of enjoyment. How-ever, before building one, be sure to consider:

e locatione type of construc tione heating and ventilatinge maintenance

LOCATIONA sunny location is best. Locate the house as farfrom trees as practical. A southern or southeaste rnexposure is best for maximum light during thewinter.The greenhouse should be convenient to water,fuel for heating, and electricity. The area shouldbe well drained.

GlassGlass houses are very attractive, permanent, andexpensive. These houses should be built by agreenhouse manufacturer or purchased in a ready-to-assemble package because they are difficultto construct. Any gardening magazine advertisescompanies selling these houses.

FiberglassHouses covered with fiberglass are durable, at-tractive, and moderately priced. They are com-mercially available or can be designed and builtby the home handyman. Only transpurent or trans-lucent fiberglass weighing 4 to 5 ounces persquare foot should be used. Most manufacturerssell a fiberglass made for greenhouses and itshould be guaranteed for 10 to 20 years. Exceptfor shading, lower grades and colored panelsshould be avoided.

Film PlasticFilm-plastic-covered greenhouses are inexpensiveand temporary . They are less attractive and require


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GREENHOUSE CONSTRUCTION HEATINGTypes of HeatersTh e greenhouse must be heated for winter use.Mony types of heating systems are available.

Use seasoned, construction-grade lumber whenbuilding the greenhouses described here. Redwoodor Douglas-fir is best.

Paint the framework with a white exterior paint toimprove appearance and reflect more light.

Posts and wood that touch the ground should betreated with copper naphthenate preservative. Donot use creosote and pentachorophenol preserva-tives because they releasevapors harmful to plants.

Polyethylene film should be installed on calmdays. Film plastic first tears at the places whereit touches the greenhouse frame or where it isfolded. Wide,unfolded sheets of plastic are avail-able anr should be used. A batten strip at leastas wide as the rafter will help extend film life.Double headed nails are often used to fasten theplastic since they are easier to remove.

Two layers of plastic can be installed to reduceheat loss as m uch as 40 percent and eliminatecondensation on the p astic. An inside layer ofplastic 2 to 4 mils thick is spaced 1 to 4 inchesfrom the outside layer to create a dead airspace.Closer or wider spacing does not create an effec-

Home Heating Systems. If a home heaters ca-pacity is adequate, it can be extended to a smallnearby greenhouse. However, the heat demand isdffforent than that of the home so a separate ther-mostat and control system are required. A heatingcontractor normallywill be needed for installation.

Space-Heaters. Either electric, gas, or oil space-heaters nre often used to heat small greenhouses.Heated air is circulated by a fan in the heater.Some space-heate rs have no fan and so are ratheruneven and ineffective. Depending on the size ofunit, space-heaters should not be more than 10 to30 feet apart to produce uniform heating.

Oil or gas heaters must be vented to the outsidesince the products of combustion are toxic toplants. Electric he t ers are easier to install andare convenient but cost more to operate than gasheaters.

Space-Heaters With Ducts. Recently a heatingsystem has been devised to distribute heat more


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TABLE O F HEAT REQUIREMENTS FOR GREENHOUSESI (13.t.u . s of Heat Requi red per Hour per Square Foot of Exposed Surface) 1

5560651 70

351824303642

Lowest Exoected Outside Tern oe30 25 20

ra tu re10 0

24 30 36 48 6030 36 42 54 6636 42 48 60 7242 48 54 66 7848 54 60 72 a4

Forced-Air Furnaces. Home forced-air furnaces wind,quality or tightness of construction, nearnessand ducts are also used to heat larger houses. to heated buildings, height of sidewalls, etc. ForClear polyethylene tubes, such as used with the most construction, each square foot of surfacespace-heaters and ducts, can be attached to the loses 1.2 B.t.u.s of heat per hour for each degreefurnace and hung overhead for distributing theheat. Again, these furnaces must be vented. of temperature difference. The table of heat re-quirements helps in calculating the heat load.

Amount of HeatThe amount of heat required for a greenhouse de-pends on the size, minimum outside temperature,minimu m temperature required inside, amount of

1

An example of how the heat requirement is calcu-lated is given in figure 1. In this case a lo- by12-foot greenhouse needs to be heated 40 degreesabove the outside minimu m temperature.

Minimum desiredinside temperature 65 F.

Minimum outside ntemperature 2 5- F.emperature 2 5- F. t


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Gas or oil heaters are frequently rated accordingto the total heat input. Some heat escapes throughin:; vent so the usable heat is only about 70 per-cent of this total. If a gas heater were used in ,thegreenhouse shown in the example, it should havea heat input rating of about

20,000p = 28,600 B.t.u./hr0.70If two layers of plastic are used, the heat loss isabout 70 percentof the loss through a single layerof plastic. If the house in the example is builtwith a double layer of plastic, the heat require-ment would then be 20,000 x0.70 = 14,000 B.t.u./hr. Of course, if a gas heater were used with thedouble plastic, its heat input would be

14,0000.70 = 20,000 B.t.u./hr

Maintenance and SafetyChoose heaters having o safety switch or safetypi lot. Be sure gas heaters are vented.Clean dust from the burners and ducts beforestarting heating in the fall.Check the flame to be sure it is burning with aclear blue color. A yellow flame indicates in-complete combustion and theflame setting shouldbe corrected.

adequate. In larger greenhouses, a ridge ventI,, the width of the house should be used. Forexample, if a house is 24 feet wide, at least a3-foot-wide (,x 24) ridge vent should be used.Side vents are often not used in houses less than15 feet long, since an open door or o few holesat each end allows enough air to enter on hotdays. For very small houses, like those on plans5941 and 5946, smaller ridge vents, open doors,or end vents provide enough ventilation.Ridge vents should be opened slightly in coldweather to allow some moisture-laden air toescape. With noventilation, humidity in the green-house becomes too high and condensation, drip,and dicey?e become severe problems.

Circulating Fans. Sometimes small fans are usedto circulate air within the greenhouse to try toeliminote stagnant air pockets. Thesefans shouldonly be used to correct a poorly designed heatingand ventilating system. In small greenhouses endin greenhouses with good heating and ventilationsystems, they are not of much use.

Cooling Fans. More positive air control is neededif the greenhouse is used in the summer. Fanswill ventilate even on a calm, hot, summer day.Also, fans are easier to control automatically thanvents. However, fans are more expensive and not


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Shading. Shades, of course, besides reducinglight, reduce the heat load in greenhouses. Shad-ing compounds that are sprayed or painted on thegreenhouse and aluminum , fibergiass, plastic, orwooden screens and panels are avai lable. Partialshading does not normally reduce su mmer lightenough to reduce growth, but it is a good way toreduce the heat load.

Humidification. During hot days the humidity ina greenhouse can become so low that plants areseverely dehydrated and even ruined. Moreover,some tropical foticge plants and orchids growbest in high humidities. The least expensive wayto increase humidity is to freque+ i water thegravel under benches and in lhrclkways. Waternozzles that periodically s #ray a fine mist arealso very effective humidifers. The nozzles canbe automatedwith a tirnmrr3ck and electric valve.

A time cycle of 1 minute on and 5 to 10 minutesoff is common . Commercial greenhouse humidifierunits can also be used.

AutomationWatering, heating, cooling, fertilizing and humid-ifying can all be done au~maticaIly. Only thebudget limits how many chores are automated.Some people prefer to control all of these opera-tions themselves, considering this part of the en-joyment of the greenhouse. However, some iobsare better handled by automatic controls. Heatersshould be controlled by a thermostat. Vents orfans can also be thermostatically controlled, butthis is not as necessary. Other automotion isnice to have but the heating and ventilation sys-tem should be automated first.


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I 2 I 7 - 0 RIDGE7 STEEL CORNER STRAP 7UNDERSIDE OF R-- ------

EL CORNER STRAqBATTEN STRI

m FOLD PLASTIC OVER ANDSTEN TO INNER SIDE oRNER STUDS AN0 RAFT

BATTEN STRIPS

ARCH FRAME

Ix.BBASE FRAME -

2~; STUDSNOTCHED 3/4BASE FRAME

iiSCREW HOOKS / iENQ VIEWCUT AWAY

?r 2 RAFTER

CONDUIT STRAPS ON BASEAND RIDGE. FASTEN WITH5/g SHEET METAL SCREWS

It.. BASE FRAME --/ TOP VIEW

CUTAWAY TO SHOW CONSTRUCTION

PERSPECTIVE VIEWFRAMING ONLY

n,,F TO POSSIBLE VARIATIONS-- .- _-----IN ANGLES WHEN THE CONDUIT ISBENT FOR ARCH FRAMES. CHECKTHE HEIGHTS SHOWN USING ANARCH FRAME as A TEMPLATE.ALL WOOD SHOULD BE TREATEDWITH PRESERVATIVE AFTER CUTTINGAND BEFORE ASSEMBLY.METAL PARTS AND FASTENINGSTO BE GALVANIZED OR OTHERWISERESISTANT TO CORROSION.METAL PARTS TO BE FASTENEDWITH SCREWS.WOOD PARTS MAY BE FASTENEDWITH SCREWS OR WITH NAILS.CLINCHED WHERE POSSIBLE.PLASTIC MAY BE FASTENED THRUTHE BATTEN STRIPS WITH NAILS.SCREWS OR STAPLES.

MATERIAL LIST_ -ITEM _____ QUANTITYBASE FRAME--- _ -4 PtSCOLLARS-------IRIDGE- _---- - -I nRAFTERS ___ - - -4 :STUDS (CENTER)- _ -2(OTHER)-- - -4CO;ER BATTENS _ - -4 uARCH FRAMES- - _ -3 CONDUIT STRAPS - _ -15 CORNER STRAPS- _ -ID PLASTIC (ENDS) - -- 2 u. ICOVERSI- - - 2 II

SIDE AND TOP COVER SUPPORTSARE 2x 4 INCH WELDED WIREMESH, HOOKED TOGETHER IN PAIRSAND HINGED LOOSELY TO THERIDGE WITH STRONG CORD.

.--.- -_COVER SUPPORTS- - - 2 q - 2 IIRATTEN STRlPS - _ - _- -- --62-0 -_.. _.. _ ____ _SCREW ,,OOKS- _. _ - 8 _ _ ,_ - - - - - -_ .- -FASTENINGS- - _ _ - - SEE NOTES - - -*- ; --SOIL HEATING C ABLE-- I - -36OW.--120-0


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l-I&II 4 MIL CLEAR PLASTI C FILM-- j8 GA W.W. MESH

I WIRE: STOP -2 1. 6 BASE FRAME

HAROWARE CLOTHHEATING CABLES

SIDE VIEW END VIEWCUT AWAY ALL WOOD SHOULD BE TREATEDWITH PRESERVATIVE AFTER SECTIONCUTTING AND BEFORE ASSEMBLY.

NOTE: SEPARATION OF HEATING CABLESIS VARIABLE TO AMOUNT OF HEATNEEDED PER SO. FT. ACCORDINGTO GEOGRAPHIC LOCATION. REFERT9 LEAFLET NO. 445 USDA.

METAL PARTS AND FASTENINGSTO BE GALVANIZED OR OTHERWISERESISTANT TO CORROSION.WOOD PARTS MAY BE FASTENEDWITH SCREWS OR WITH NAILS.PLASTIC MAY BE FASTENED BYCLOTHES PINS OR BY PLASTIC

-----j r:.,. STOP

/II / Ii-- 2~ 8 BASE FRAME

8 GA. WELDED WIRE MESH

CABLES

TOP VIEWCUT AWAY

zEl2 PCS.I PC.3 PCS.2 PCS.

I PC.2 PCS.4 IN.I PC.

PERSPECTIVE VIEQ -NOT TO SCALE

MATERIAL LIST2% a- 5 LONG FOR SIDES2~ 8- 3 - 6 LONG FOR ENDSli I WIRE STOP- 5-2LONG FOR SIDESNO.6 GAUGE 6x6 WELDED WIRE, 5 LONG4- 6 WIDE FOR TOP OF WOOD FRAME TOSUPPORT PLASTIC FILM.PLASTlC WEBBING 2 WIDE - 5 LONGPLASTIC FILM, 4 MIL. CLEAR 3WlOE7 LONG.360-WATT SOIL HEATING CABLE. THERMO-STATICALLY CONTROLLED TO SHUT OFFAT 70F.WHITE PLASTIC FILM, 4 MIL, 5x6 FORCOVERING FRAME DURING WINTER.CHEESECLOTH, 3~ 7SAND - 2ABOVE. 2 BELOW HEATING CABLEL/2 HARDWARE CLOTH, 5~ 3 l/2

DESIGNED IN COOPERATION WITH :CROPS RESEARCH DIVISION

COOPERATIVE EXTENSION WORK INAGRICULTURE AND HOME ECONOMIC

aHDLllTEO5TITE5DEPlkTLIENTOF~GRICLTRLCOOCfI.TIIMINI-HOTEEO AND PROPAGATINGFRAME

USDA. 69 6060 SHEET I OF


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r TOP PLATE BEVEL

Ll/L4,n%-CARRIAGE BOLTIN VIA DIA HOLES

h.HOLES FOR1 JANCHOR RODS

L ?:a' I- 5:0-RIGHT END4LEFT END FRONTPANEL FRAMING DETAILSALL FRAYING MEMBERS ARE f.2: TREATEDWITH PRESERVATIVE AFTER CUTTING.CHECK ALL DIMENSIONS ON THE JOB.ANCHOR TO GROUND WITH hm~~5m~~~~~RODS WITH TOP 2=BENT 9055 PAIR 3-x 3 LOOSE-PIN BUTT HINGES ARE REOb.

VENT COVER A--rr TOP PLATE BEVELED

1 q -5+J-

ag FASTENING DETAIL

r--II ;T5n-;

+ IL- VENT.(L1 OPENING-IDI 71 l

.- _

1-

lECTlON A-A 7 : a-REAR

COOPERATIVE EXTENSION WORK INAGRICULTURE AND HOME ECONOMIC S

LA4TOP .10, LDOT~LDEPTYENTOn(CULNESmnTnCPLASTIC COVEREDGREENHOUSE-COLDFRAMEONE. IO 1 EX.5941 1 SHEET I OF0


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=.nBENCH 8 BENCH SUPPORTS +,/NOT SHOWN IN THIS VIEW dI / 2. I I 7[CORRUGATED 284 FRAMES

,A ,PLAT

PANELS

12- 0.

II w 4- 0 w RIDGE ROLLCORRUGATED FIBERGLASS PANELS

14x4 PURLINS (3) EACH SIDE

CORRUGATEDFIBERGLASSPANELSBENCH SUPPORTSSEE DETAIL A3 GRAVEL FILL1x12 REDWOOD BOARD:

NOTE *I%14x6 CLEATS CENTEREDIN 4-OR BAYS B NAILED TOUNOERSIOE OF EAVE PURLINSFOR THE PURPOSE OF SECURINGTOP EF)GE OF SIDE FIBERGLASS ALTERNATE:

FLAT FIBERGLASSPANELS AT ENDS

Il&L1 ISOMETRIC VIEWI vi 4 - 0 V.

DOOR ONE ENDOOR ONE END

1 I IO-O I I- L$-.- -.~~ ~~ *~p..p-..-qCOPPER NAPHTHENATE

CROSS SECTION

-&----&yf~;--~ ,%/ePLYWOOO GUSSETS

0_IN 4-0 CENTERS GRAVEL

FRAMING MEASUREMENTS

BLOCKS UN0SUPPORTS

PLAN BASED ON: UNIV. OF ILL. CI R. 8808 RUTGERS PLAN NO. I58

4-DETAIL A

FILL

COOPERATIVE EXTENSION WORK INAGRICULTURE AND HOME ECONOMICS

HOME GREENHOUSENJ 74 1 6181 1 SHEET I OF i


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15/20

9 GALTIES,

VANIZEDTWISTED-7

NO,I WIRE ONE COLLARTIE, OVER(THIN-WALL

FRAMING ELEVATIONS

FRAMING PLAN

5 MIL TYPE W-POLYESTER FILMCEMENTED TO OUTSIDE OF PANELROOF PANELS SLIOEDOWN FOR REMOVALOR VENTILATIONAT RIDGE

IN-WALL CONDUIT IOFLATTEN 6 EACH EN% CARRIAGE BOLT WITH WASHER

5ht2 LAG SCREW$a,3

2x4 POSTSIX4 SASH STr ,1X3 AT CORNERS) xa+

YL 2X12x16-9 t/z

/eh Vak46 WI. NONCORROSIVEMETAL BRACES. FASTEN WITHI NO 6 NONCORROSIVEWOOD SCRErYS3 MIL FILMCEMENTEDTO INSIDE OFPANEL

DOUBLE-GLAZEDWALL PANEL WITHLOOSE-PIN HINGES

TWO 3 NO. ID SCREWS

SECTION A-ANOT TO SCALE

..-4:-o JROOF SASH PANEL

CROSS SECTION_ RIDGE CAP MEMBERS ARE CUTUSE LONGER BOLT AND TWO F TO ANCHOR ENDS OF WIRE TI FROM 1x4 COVER WITH AN WIDE STRIP OF SHEET METAL

4-2 C C.3. RooF PANEL (RAFTER NOT

2X4x16-9 l/zPLATECAP

SHOWN)

6 GUTTERSPIKE

1~4x16vdk I l/eAT EAC.. . v-1

kl2 F.B.Y Drl2-rIX4 STOP

3/1&l~/2il2 F.6. WITH ah DIA.CARRIAGE BOLT 8 %kz LAGSCREW T O EACH RAFTER

2X3 RAFTER END RAFTER / END WALL RIDGE DETAILPANELCOOPERATIVE EXTENSION WORK INAGRICULTURE AND HOME ECONOMIC5

I , lrEAVE CONNECTIONS IX1 PANEL SUPPORTS WITH14 BEVEL FOR GUTTER 4RAFTER DETAILS NOTE:CONSULT LOCAL HEALTH AND PLASTIC GREENHOUSEJSDA 76 1 6251 1 SHEET I OF 2BUILDING CODE AUTHORITIEGBEFORE STARTING CONSTRUCTION.


16/20

FSIDE

Vdi l/z METAL STRAP.FLUSH WITH WOOD.

GABLE SASHI TWO REQD

o/ ~-GRADE LINEDOOR DETAIL C

DOWN AT EACH END

1x1 STRIP TO RETAINEND WALL PANEL O NLY

WALL SASH PANEL1x1 STRIP, FULL

EIGHT REODNOTES:THE ROOF PANELS AREHELD IN CLOSED ORPARTLY OPEN POSITIONSBY 6d DOUBLE-HEADEDNAILS IN HOLES DRILLEDTHROUGH LOWER END OFbIM;\R CAP INTO PANEL

INSTALL RESILIENTWEATHER STRIPPING TOCLOSE THE SPACEBETWEEN THE PLATESAND ROOF PANELS.ALL WOOD PARTS TOBE TREATED, AFTERCUTTING, Wl Tli ACOPPER-NAPTHENATEPRESERVATIVE.ALL METAL PARTS* SHOULD BE OF NON-CORROSIVE METAL OR,,E;t P GALVANIZED

2~4~13~3~FILLER, WITH r 4 I 3- IO TIEfetlA METAL STRAP, FLUSHWITH WOO D, EACH SIDE

2x2. BEVELED~--214rlOO~--22r2

-

la3 SASH STOP FORSIDE WALL PANEL

2x4113-3DOOR STOP

DOOR PANELTWO REP0

APPLY FILM TO INSIDE FIRST OUTER FILMSHALL EXTEND OVER TOP RAIL AN0 LAPTHE TOP EDGE OF THE INNER FILM

END WALL SASH PANELFOUR REQD. TWORIGHT 8 TWO LEFTi 1 2x12 rl2-0 NOTCHEI1 I 31h t35 FOR DOORI I BEVEL TOP EDGE FOLJ DRAINAGE I

END WALL FRAMINGBGALYANIIED T-HINGE WITH BRASS PIN PINSHOULD GE REMOVABLE. INSET SO LEAVES AREFLUSH WITH THE SURFACE OF WOO0 MEMBERS FOREASE IN APPLYING OR REPLACING THE PLASTIC FILM

~le'iIVz'i8" GALV STEEL

COOPERATIVE EXTENSION WORK INAGRICULTURE AND H OME ECONOMIC

DOOR DETAIL Et SILL DETAIL A6- 5 4 , * 0 12 9 6, 1 0

PLASTIC GREENHOUSEUSDA * 76 1 6251 1 SHEET 2 OF


17/20

7 NO 9 GALVANIZED/- WIRE TIES, TWISTED

DOUBLE-GLAZEDWALL PANEL WITHWITH WASHER %,

??I2x4 POSTS s-yg-ilx4 SASH STC ,1x3 AT CORNERS1 %w

d+I

2xl2rl69 I/z

ROOF PANELS SLIDE =+DOWN FOR REMOVAL -AOR VENTILATIONAT RIDGE \LONG. FLATTEN 6EACH END

-i

At- --

(THIN-WALL

FRAMING PLAN

5 MIL TYPE W-POLYESTER FILMCEMENTED TO OUTSIDE OF PANEL

mk 2 FRAME \

I/sk %k46vi NONCORROSIVE 3 MIL FILMMETAL BRACES. FASTEN WITH CEMENTEDI NO. 6 NONCORROSIVE TO INSIDE OFWOOD SCREJYS PANEL

TWO 3 NO. IO SCREWS

USE LONGER BOLT AND TWTO ANCHOR ENDS OF WIRE

4-2 I. 2.---+ - - --* - .-I I

ROOF SASH PANELIO6 0 1 2

SECTION A-ANOT TO SCALElx4rl69~/z RIDGE

CAP

~hk~v$kW F.B. WITH a/s DIA.CARRIAGE BOLT 8 vmk 2 LAGSCREW TO EACH RAFTER COOPERATIVE EXTENSION WORK INI I /I I AGRICULTURE AND HOME ECONOMICS.-...---.-..- ..-.--- ---- . ..-..- ---..- . ..___..^ MALL HlIJtit DETAIL,e, INI,EDSTIIL*DEP*II,Y~~*~~~~~,~~~~=~,~~.,~~~

,,RlOGE CAP MEMBERS ARE CUTFROM 1x4. COVER WITH AN

8 WIDE STRIP OF SHEET METALROOF PANEL (RAFTER NOT SHOWN)

h2 F.E

POST

EAVE CONNECTIONS RAFTER DETAILS NOTE:BEFORE STARTING CONSTRUCTION.


18/20

5-3

LEG

4_ay 4/ I van 2 VI2-I--- A-

RAFTER

FRAME CUTTING LAYOUT (CUT FROM (8) 2x4~10)

f

=0-0P

i

&-i-JI-/ A A A A

A A A AA

b-;j \ A A A_ A A A A

T I 7 1- 1,Bk-b L/ \, B __. B 1 y .,0 ,-< ,/ +--yy

, /4 XTYPE C-C PLYWOOD__-. -__--.- --PLYWOOD SHEET CUTTING DIAGRAM

I2 6 0 I

I6 Vs

BILL OF MATERIALS 4CORRUGATED FIBERGLASS REINFORCED PANELS (FR PI l5 OZ COATING:

ROOF PANELS (61 2ilO CUT IN HALFSIDE PANELS (5) 2kl2: 2 SHEETS EACH SIDE

5 TH SHEET CUT LENGTHWISEEND PANELS (91 zke OF WHICH 5 ARE LOCATEDAT END WITH NO DOOR

RIDGE ROLL (I I 12 LENGTHLUMBER(8) 2r4rlO TO MAKE FRAMES(2) 2x4~10 SILL AT ENDS (PT COPPER NAPHTHENATE)(21 2x4~12 SILL AT SIDES (PT COPPER NAPHTHENATE)(21 2~4x16 END FRAMINGBENCH SUPPORTS NOT INCLUDED(8) 5/.r4xl2 FOR PURLINS 8 DOOR(2) 4~4x16 PT POST FOR FOOTINGS(21 1x12112 6 (21 lxl2rlO REDWOOD BOARDSI I) 4rBr 14 EXTERIOR TYPE CC PLYWOOD SHEET FORPLYWOOD GUSSETS SEE CUTTING DIAGRAM

c CHECK WITH FIBERGLASS SUPPLIER FOR NECESSARYRELATED HARDWARE .S COVERING INSTRUCTIONS

NAILS. HINGES B LATCH

SIDE GUSSETSI6 REPD

HEAD GUSSETS8 REQD

BLOWER A-i END WALLFOR INFLATION OFPLASTIC LAYERS.SEE SECT. A-A DOUBLE LAYER 6 MILL PLASTICFLATED, INASS PANELS.OF PLASTIC WILLTIMES. ONCE4 YEARS.)

i i i rI I 4 IALTERNATE CROSS SECTION

HOLE IN PLYWOOD SAMESIZE AS BLOWER OPGCIRCULAR SHEET METALPLATE TO ADJUSTOPENING INTO BLOWER. ---4

PLYWOOD SHEET SECURED TO /-,/FRAME FOR MOUNTING OF BLOWER

AIR PASSAGE ADAPTER(PLASTIC POT WITH HOLEIN BOTTOM IS SUITABLE)I w PLASTIC TUBING TAPED TOBLOWER HOUSING B ADAPTERBLOWER SECURED TOPLYWOOD TO DRAWIN OUTSIDE AIR

ENVIRONMENTAL CONTROLHEATING:

TO MAINTAIN A TEMPERATURE DIFFERENCE OF 60BETWEEN INSIDE a OUTSIDE30,000 BTUlHR SINGLE COVERING20,000 BTU/HR DOUBLE COVERING

CONNECTION TO HOME HEATING SYSTEM IS MOSTDESIRABLE. IF NOT POSSIBLE, USE GAS OR OILHEATER VENTED TO THE OUTSIDE. ELECTRICHEATERS ARE EASY TO INSTALL, CLEAN, BUTEXPENSIVE TO OPERATE WHEN USING OIL ORGAS, BE SURE TO PROVIDE A FRESH AIR SUPPLYDIRECT LY TO THE HEATER TO SUPPLY OXYGENFOR COMBUSTION.VENTILATING:REOUIRE A TWO SPEED FAN RATED AT 1000 CFM.AN AUTOMATIC AIR INLET OF 2 SO. FT. ISREOUIRED . THE FAN CAN BE M9UNTED IN ONEGABLE EN0 AND AIR INLET IN THE OTHER. BOTHSHOULD BE CONTROLLED BY A THERMOSTATFOR MORE INFORMATION S(E USDA BULLETINNUMBER 3 57 BUIILD ING HOBBY GREENHOUSES.

SECTION A-A

COOPERATIVE EXTENSION WORK INAGRICULTURE AND HOME ECONOMICS


19/20

II vn/ei 4- 0 ve

_ CORRUGATED FIBERGLASS PANELS

CORRUGATEDORRUGATED

BENCH B EENCtl SUPPORTSENCH B EENCtl SUPPORTS,./NOT SHOWN IN THIS VIEW./NOT SHOWN IN THIS VIEW

2x4 SILL P.Tx4 SILL P.T

NOTE -I%x4x6 CLEATS CENTEREDIN 4-0 BAYS a NAILED TO 1.lUNDERSIDE OF EAVE PURLINSFOR THE PURPOSE OF SECURINGTOP EDGE OF SIDE FIBERGLASSPANELS.

\ LTERNATE:LTERNATE:FLAT FIBERGLASSLAT FIBERGLASSPANELS AT ENDSANELS AT ENDS

5hr4 PURLINS (3) EACH SIDE

CORRUGATED/ / FIBERGLASSPANELS

_ BENe:H SUPPORTSSEE DETAIL A3 GRAVEL FILLxl2 REDWOOD BOARD

GRADE

I I 4x4x4-0 POST ATI I--loI CORNERS AND CENTERSPRESSURE-TREATED WITHL COPPER NAPMTHENATECROSS SECTION

;I; ISOMETRIC VIEW

NAILSSIDE

BRICK 0BLOCKS UNDERSUPPORTS w-

DETAIL AEAVE.(l2) 4d NAILSEACH SIDE

FRAMING MEASUREMENTS=0_I0 =w_N

=m-ii-

DOOR ONE END

lr---------- Y -------~-- -----1 Ir I,I I/ II

I,II

II II 1, ,I I

1~I IIII /I ji,I

L8 I

I--__---. il 1PLAN

COOPERATIVE EXTENSION WORK INAGRICULTURE AND HOME ECONOMIC S

HOME GREENHOUSEN.l 74 1 6161 1SHEET I OF 2,ASED ON: UNIV. OF ILL. CIR. 860

8 RUTGERS PLAN NO. 156L


20/20

7 NO 9 GALVANIZED/- WIRE TIES, TWISTED

DOUBLE-GLAZEDWALL PANEL WITHWITH WASHER %,

??I2x4 POSTS s-yg-ilx4 SASH STC ,1x3 AT CORNERS1 %w

d+I

1 ; l2- 0---...__----- --- ---- ~-- --.-.. .~~ -I I

ROOF PANELS SLIDE =+DOWN FOR REMOVAL -AOR VENTILATIONAT RIDGE \LONG. FLATTEN 6EACH END

I I I 1Ld LJ - -.CROSS SECTION

-i

At- --

(THIN-WALL

FRAMING PLAN

5 MIL TYPE W-POLYESTER FILMCEMENTED TO OUTSIDE OF PANEL

mk 2 FRAME \

I/sk %k46vi NONCORROSIVE 3 MIL FILMMETAL BRACES. FASTEN WITH CEMENTEDI NO. 6 NONCORROSIVE TO INSIDE OFWOOD SCREWS PANEL

TWO 3 NO. IO SCREWS

USE LONGER BOLT AND TWTO ANCHOR ENDS OF WIRE

4-2 L 2.---+ - - --* - .-I I

ROOF SASH PANELIO6 0 1 2

SECTION A-ANOT TO SCALElx4rl69~/z RIDGE

CAP

~hkv$kW F.B. WITH a/s DIA.CARRIAGE BOLT 8 vmk 2 LAGSCREW TO EACH RAFTER COOPERATIVE EXTENSION WORK INI I /I I AGRICULTURE AND HOME ECONOMICS.-...---.-..- ..-.--- ---- . ..-..- ---..- . ..___..^ MALL HlIJtit DETAIL,e, INI,EDSTIIL*DEP*II,Y~~*~~~~~,~~~~=~,~~.,~~~

/RIDGE CAP MEMBERS ARE CUTFROM 1x4. COVER WITH AN

8 WIDE STRIP OF SHEET METALROOF PANEL (RAFTER NOT SHOWN)

h2 F.B

POST

EAVE CONNECTIONS RAFTER DETAILS NOTE:

Date post:	03-Jun-2018
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