Green OCAD
Alright, I've got some presents for everyone. These are the responses I've gotten from the various correspondances I've been doing through the course of this project. First one's from Scott Wylie, Wytech Building Envelope Solutions, Inc. from November 8th:
"Chad,
Questions that need to be addressed:
Is the existing roof membrane in good condition. No sense installing a rooftop garden only to experience a leak! The cost of a green roof removal just to locate a leak can be cost prohibitive.
The absolute minimum green roof dead load weight is 16 lbs/sq.ft. Typically, we prefer to see between 25-30 lbs /sq.ft. These weight are typically very light for many roofs to support. If in doubt always call an engineer for advice.
The area you want to "green" is unlimited, but typically 5,000 sq.ft. is a nice sized rooftop garden. I've done as small as 100 sq.ft. projects!
A green roof can not be installed under $10.00 per sq.ft. No exceptions! Some may claim to provide lower pricing but conveniently forget to mention the added costs for transportation, installation, irrigation, maintenance, etc. At $10.00 per sq.ft. that includes a root barrier, drainage/moisture retention and aeration panels, 6" engineered soil or sedum blanket.
If a new roof needs to be installed, typically $20.00 per sq.ft absolute minimum is required.
Find attached two projects for your review. You need to phone ahead but 215 Spadina has a phenomenal rooftop garden.
E-mail any time if you have additional questions or request technical literature i.e. energy savings, dead load weight, etc.
Scott Wylie
Wytech"
Second is from Rob Pyke, Manager of Special Projects at OCAD, which he sent on November 20th:
"Chad:
Coincidentally I met Scott Wylie at a roof seminar last week.Interesting speaker and certainly an expert on green roofs. He actuallymakes a distinction between green roofs and what he calls vegetativeroofs which is a sub-set of green roofs. A green roof in his words was aroof designed with environmental impact in mind: durability, recycledmaterial content, recyclable, solvent content, quantity of insulation,solar and wind power, and other considerations.
Weight: I agree with the weight estimates, and although a structural engineer would have to be involved at some point, I don't think weightwould be a stumbling block in our case.
Cost: I think the cost estimates are a little low because of the height, limited street access, and a lot of mechanical equipment in the way. Iwould suggest a cost closer to $30/sq. ft.
Typically, the main advantage of a vegetative roof is that they areattractive and you can use them as a roof top garden. The roofs atpresent are not designed to be occupied. We would need guard rails, a2nd exit, fire alarm and so forth if occupying the roof was desired.
Wind on the table top would have to be a consideration because of soilerosion. A special mix of grow medium would be required.
As far as permission goes to do fundraising that is not my area.
Good luck with your project and let me know if you have specific questions.
Yours truly,
Rob Pyke, P.Eng.
Manager, Special Projects"
Peter Caldwell, OCAD's VP, also e-mailed me with a response to our intended ideas with the green roof/interior and exterior plantings, but I won't post that here, since it's more or less directly involved with how our project could/couldn't succeed the way we'd had it set up, instead of actual information such as what's contained in the two above.
So, yeah. If anyone wants to see the pictures that Scott Wylie sent me of the two projects he's done, leave a comment with your e-mail or something and I'll send them to you.
Well, just thought I'd share. Later!
"Chad,
Questions that need to be addressed:
Is the existing roof membrane in good condition. No sense installing a rooftop garden only to experience a leak! The cost of a green roof removal just to locate a leak can be cost prohibitive.
The absolute minimum green roof dead load weight is 16 lbs/sq.ft. Typically, we prefer to see between 25-30 lbs /sq.ft. These weight are typically very light for many roofs to support. If in doubt always call an engineer for advice.
The area you want to "green" is unlimited, but typically 5,000 sq.ft. is a nice sized rooftop garden. I've done as small as 100 sq.ft. projects!
A green roof can not be installed under $10.00 per sq.ft. No exceptions! Some may claim to provide lower pricing but conveniently forget to mention the added costs for transportation, installation, irrigation, maintenance, etc. At $10.00 per sq.ft. that includes a root barrier, drainage/moisture retention and aeration panels, 6" engineered soil or sedum blanket.
If a new roof needs to be installed, typically $20.00 per sq.ft absolute minimum is required.
Find attached two projects for your review. You need to phone ahead but 215 Spadina has a phenomenal rooftop garden.
E-mail any time if you have additional questions or request technical literature i.e. energy savings, dead load weight, etc.
Scott Wylie
Wytech"
Second is from Rob Pyke, Manager of Special Projects at OCAD, which he sent on November 20th:
"Chad:
Coincidentally I met Scott Wylie at a roof seminar last week.Interesting speaker and certainly an expert on green roofs. He actuallymakes a distinction between green roofs and what he calls vegetativeroofs which is a sub-set of green roofs. A green roof in his words was aroof designed with environmental impact in mind: durability, recycledmaterial content, recyclable, solvent content, quantity of insulation,solar and wind power, and other considerations.
Weight: I agree with the weight estimates, and although a structural engineer would have to be involved at some point, I don't think weightwould be a stumbling block in our case.
Cost: I think the cost estimates are a little low because of the height, limited street access, and a lot of mechanical equipment in the way. Iwould suggest a cost closer to $30/sq. ft.
Typically, the main advantage of a vegetative roof is that they areattractive and you can use them as a roof top garden. The roofs atpresent are not designed to be occupied. We would need guard rails, a2nd exit, fire alarm and so forth if occupying the roof was desired.
Wind on the table top would have to be a consideration because of soilerosion. A special mix of grow medium would be required.
As far as permission goes to do fundraising that is not my area.
Good luck with your project and let me know if you have specific questions.
Yours truly,
Rob Pyke, P.Eng.
Manager, Special Projects"
Peter Caldwell, OCAD's VP, also e-mailed me with a response to our intended ideas with the green roof/interior and exterior plantings, but I won't post that here, since it's more or less directly involved with how our project could/couldn't succeed the way we'd had it set up, instead of actual information such as what's contained in the two above.
So, yeah. If anyone wants to see the pictures that Scott Wylie sent me of the two projects he's done, leave a comment with your e-mail or something and I'll send them to you.
Well, just thought I'd share. Later!
posted by Chad Cutler at
11:18 PM
1 Comments:
Hi,
I just wanted to comment on some of the informaton you posted up.
Not all green roofs have to be preferably between 25-30 lbs /sq. and they do not need 6" of soil. These figures add a lot of unecessary weight and cost to a green roof project. In fact, our most popular system the XF 301 weights about 12 lbs /sq and has a depth of only 2.5"-3". Xero Flor Canada Ltd. is the pioneer in green roof technology and we have 35 years of experience to prove that the previous statements are true. We conduct research with Michigan State University and British Columbia Institute of Technology to ensure that all of our products perform at the highest standards.
I just wanted to let you know that they are other options that have been tried, tested and proven true. If you have any other questions you can forward them to joy.schmidt@xeroflor.ca or you can visit our website xeroflor.ca
By
Sasha - Xero Flor Canada, at 9:30 AM
Post a Comment
<< Home