Calculating greenhouse plastic

salvage_queen(29583 SC)November 10, 2007

How do you calculate how much plastic you need? My greenhouse is going to be 35' x 60' arch type and 12' tall.

Thank you for reporting this comment. Undo
ole_dawg(7 UpCountry SC)

You need to give more information at to the shape of your GH. Does it have straight walls? Is it like a quanset hut and a true 1/2 circle? If it has straight walls how tall are they?

1eyedJack and the Dawg

    Bookmark   November 11, 2007 at 10:54AM
Thank you for reporting this comment. Undo

Here is a link to a greenhouse area calculator. It is primarily for heater calculations, but it gives the surface area, which is the amount of plastic needed. Just subtract any parts not to be covered with plastic.

Here is a link that might be useful: greenhouse surface area calculator

    Bookmark   November 11, 2007 at 3:41PM
Thank you for reporting this comment. Undo

Doubt whether help provided by that link, Cuestaroble. If Salvage Queen measures the arch all his problems would be solved; well not quite. I don't have an exact answer either but most references recommend that for any arch type structure you simplify the math by ignoring the height and using the width as the diameter (35 ft. in your case).

Then the width of film needed would be calculated by the formula: 1/2 * 3.14 * 35 = 55. Naturally, if you order a 56' wide sheet of film it will leave you with a few extra feet on each side. The next smaller size that I've seen available is 52' and that won't be enough unless you have raised kneeboards. I use 48' wide sheets on my 30' structure with a little to spare.

My only advise- Don't cut yourself short in the width.

    Bookmark   November 13, 2007 at 4:18PM
Sign Up to comment
More Discussions
Buying an older greenhouse business?
What would someone want to go by when figuring what...
subterranean heating/cooling in a Mid-Atlantic (Maryland, z7) climate
I'm posting as a separate topic since I'm "late...
Greenhouse plastic problem
I built a 12'x 28' greenhouse a few years ago.It is...
How do I convert a 2nd floor bedroom to a winter greenhouse?
Not much room to bump it out (there is a mountain in...
What are considered warm and cool weather plants for...
Sponsored Products
Clean Machine Door Mats Flair Cinder 24 in. x 36 in. Door Mat 10371851
$18.97 | Home Depot
Access Lighting Trinity Energy Star Bar Pendant Assembly 52026 - 28W in. - 52026
$178.00 | Hayneedle
Modern Indoor/Outdoor Area Rug: Karastan Rugs Findon Brown 9 ft. 6 in. x 13 ft.
Home Depot
Beecham Swing Co. Cedar 4-ft. Porch Swing & Stand Set - BS007
$349.98 | Hayneedle
Kichler Dover Chandelier - 24W in. Tannery Bronze ENERGY STAR - 10320TZ
$280.00 | Hayneedle
Area Rug: Triexta Satin Stillwater 4' x 6'
Home Depot
Designers Fountain Fluorescent Wraparound - White - WA102-WH
$41.40 | Hayneedle
Contemporary Indoor/Outdoor Area Rug: Mohawk Home Rugs Triexta Satin Burnished
Home Depot
© 2015 Houzz Inc. Houzz® The new way to design your home™