Square Foot Gardening Forum

Hello Guest!
Welcome to the official Square Foot Gardening Forum.
There's lots to learn here by reading as a guest. However, if you become a member (it's free, ad free and spam-free) you'll have access to our large vermiculite databases, our seed exchange spreadsheets, Mel's Mix calculator, and many more members' pictures in the Gallery. Enjoy.


Search
 
 

Display results as :
 

 


Rechercher Advanced Search

Latest topics
» CANADIAN REGION: What are you doing December 2016
by Kelejan Today at 1:42 am

» N&C Midwest: December 2016
by Scorpio Rising Yesterday at 10:32 pm

» Mid-South: December 2016
by Scorpio Rising Yesterday at 10:26 pm

» Mid-Atl - Dec 2016 - Seed Catalog ?
by Scorpio Rising Yesterday at 10:24 pm

» Gardening in Central Pennsylvania
by Scorpio Rising Yesterday at 10:21 pm

» 1st Seed Catalog Arrived :)
by Scorpio Rising Yesterday at 10:15 pm

» Tomato Tuesday 2016
by AtlantaMarie Yesterday at 8:06 pm

» Holy snow Batman!
by donnainzone5 Yesterday at 4:40 pm

» Second Year SFG in Canada
by trolleydriver Yesterday at 4:06 pm

» TrolleyDriver's Compost Thermometer
by trolleydriver Yesterday at 4:01 pm

» Amaranth
by countrynaturals Yesterday at 12:06 pm

» Northern California & Coastal Valleys - What are you doing this month?
by countrynaturals Yesterday at 12:03 pm

» Garlic: Freeze, thaw, and heave
by donnainzone5 Yesterday at 11:14 am

» Live and learn
by jimmy cee Yesterday at 9:08 am

» New England, December 2016
by sanderson Yesterday at 4:09 am

» AtlantaMarie's Garden
by countrynaturals 12/4/2016, 2:04 pm

» Mychorrhizae Fungi
by audrey.jeanne.roberts 12/4/2016, 1:28 pm

» December 2016 Avatar: Show your Winter Season Colors!
by Scorpio Rising 12/3/2016, 11:17 pm

» SFG not giving the results I expected
by No_Such_Reality 12/3/2016, 7:21 pm

» New Member
by trolleydriver 12/3/2016, 4:14 pm

» First season SFG results / lessons learned
by countrynaturals 12/3/2016, 10:36 am

» Eat Broccoli Leaves? Brussels Sprouts? Cauliflower?
by sanderson 12/3/2016, 2:55 am

» Winter's Coming!
by sanderson 12/3/2016, 2:53 am

» Dry versus fresh spices to infuse vinegar
by sanderson 12/3/2016, 2:50 am

» 2016 SFG in Brooks, Ga
by sanderson 12/3/2016, 1:28 am

» Senseless Banter...
by MrBooker 12/2/2016, 5:17 pm

» Blanching and Freezing Vegetables
by sanderson 12/2/2016, 4:59 pm

» Your Christmas wish list?
by sanderson 12/2/2016, 4:29 pm

» SFG Adventure of a first time gardener in ND
by sanderson 12/2/2016, 4:14 pm

» Fusion Life Brands Power XL pressure cooker
by CapeCoddess 12/2/2016, 2:39 pm

Google

Search SFG Forum

Roof Top Garden

View previous topic View next topic Go down

Roof Top Garden

Post  sfg4uKim on 9/21/2011, 9:53 pm

I was teaching an Intro class at the local community college this evening and one of my students is a teacher at a very large Catholic school.

One of the things they are considering is a "green roof" and she wants to introduce the idea of an SFG there. I'm "assuming" (yeh, I know what they say about that) they have already had the structure inspected, but she thinks they may want to consider an SFG up there!

I would love some thoughts here. What things do you think I need to ask or make sure they are taking into consideration?

Presumably a structural engineer could give a lbs. per square foot (or some such measurement) that the roof would hold. Of course I could find out how much a raised bed with a bottom would weigh. I could soak 8 cf of Mel's Mix and see how much it weights sopping wet.

BUT how would I estimate the weight of mature plants? For instance watermelons or a full tomato plant?

HELP! LOL

Also, they have a group from the school that goes to Haiti every year and she thinks they'll be interested in introducing SFG there.


____________________________

I have seen women looking at jewelry ads with a misty eye and one hand resting on the heart, and I only know what they're feeling because that's how I read the seed catalogs in January - Barbara Kingsolver - Animal, Vegetable, Miracle


sfg4u.com
FB: Square Foot Gardening 4 U




sfg4uKim

Certified SFG Instructor

Female Posts : 1865
Join date : 2010-09-30
Age : 58
Location : Glen Burnie, MD

View user profile http://sfg4u.com

Back to top Go down

Re: Roof Top Garden

Post  ModernDayBetty on 9/21/2011, 10:33 pm

I'm not sure if it was Urban Homesteading or Mother Earth News but one of the two talked about roof top gardening and suggested self watering containers. It's difficult to get water up to the roof and it helps minimize run off.

I have no personal experience.

ModernDayBetty

Female Posts : 298
Join date : 2011-03-19
Location : Central Washington Zone 7a

View user profile

Back to top Go down

Re: Roof Top Garden

Post  boffer on 9/21/2011, 11:58 pm

ksroman wrote:...Presumably a structural engineer could give a lbs. per square foot (or some such measurement) that the roof would hold. Of course I could find out how much a raised bed with a bottom would weigh. I could soak 8 cf of Mel's Mix and see how much it weights sopping wet.

BUT how would I estimate the weight of mature plants? For instance watermelons or a full tomato plant?

Early this year, Furbalsmom did the work for you. Extrapolating from her extra deep box, a 4x4x6 inch box needs 19 gallons of water to saturate the MM. (water is 8 pounds per gallon *closies count in sfg*). Heaviest case is using 2x boards and 3/4 ply. Round up for safety, and call it 250 pounds for a 4x4x6 box of saturated MM ready to plant. Can the roof support two adult men? It will support the box. Realistically, the weight of the veggies doesn't matter.

I would look for reasonably easy access, a water source on the roof, and easy disposal of plant debris at harvest time.

Something to watch for: rooftops can be considerably hotter than standing on the ground. It depends on the type of construction, and whether the space under the roof is insulated or vented.

boffer

Male Posts : 7392
Join date : 2010-02-26
Age : 63
Location : yelm, wa, usa

View user profile http://boffer.us/

Back to top Go down

Re: Roof Top Garden

Post  AZDYJ2K on 9/22/2011, 12:40 am

If you're worried about weight you can distribute it over a wider area. For example if you had 250 lbs and used four 4"x4" posts to support it, there would be 62.5 lbs of weight on each post (approximately 15 lbs/sq in). However, if the posts rested on a plywood platform then it would distribute the weight over much of the platform. Even if you put it on a frame made of 2x4's that would help distribute the weight.



As Boffer said, if the roof can support 2 men, it can support a box. However, you also need to account for the weight of the person or people working on the box(es).

AZDYJ2K

Male Posts : 169
Join date : 2010-05-28
Location : Chandler, AZ USDA Zone 9A

View user profile

Back to top Go down

Re: Roof Top Garden

Post  Sponsored content Today at 5:12 am


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum