I am currently thinking about the roof design (for each section of seating, not the entire stadium). I would appreciate suggestions and opinions on the design. Both cost and function are required. There are some very cheap designs that would detract from the aesthetics of the stadium. Coming up with a roof design should not be a problem (since there are many choices), it is just the cost.
One that I like is the Alamodome design. This uses 4 columns in each corner with suspension cables to support the roof. Since we have a much smaller area to cover the columns wouldn't have to be as high since our exterior walls are much lower (500 feet by 120 feet for each section of stands, with the corner section of roof attached directly to these columns). It also brings up a point to consider. If the columns are strong enough, and the stadium is extremely successful then in 5 - 10 years after construction, having a complete roof (during the winter only) might become a requirement. If the sideline seating section roof is strong enough then it might be possible to also use it to support a roof over the field during the winter that could be assembled in say one day. If there is to be an extremely heavy snowfall it could be removed in a day (if the snow fall would exceed the strength of the roof). Also, it could possibly be assembled for large concerts to protect the concert goers on the field. Essentially it would be a giant canopy style roof covering the field supported by the roof of the seating sections.
Another type of roof is the one proposed for the new Winnipeg Stadium (
http://www.blueandgold.ca/ ). This looks like it might become costly though. Maybe a variation of this type.
Then there are cheap cantilever and internally supported roofs (like at the Halifax Forum and Fenway Park). An interesting link to information on stadium construction and a few different types of roofs is at
http://www.grandstands.net/canopy_roof.htm .
QUESTION for people on this forum: I am going to use
guesstimates below based on my gut feeling in order to illustrate a point (
these are not real numbers):
Flat Slanted Roof with some internal supports about half way up the stands - (for example) say would be $5,000,000 for both stands (total price).
Flat Slanted Roof that is externally supported, i.e. columnless design (cantilevered design, or externally supported with exterior columns and cables, or using a very large King Trusses like in the Halifax Metro Centre) - (for example) say would be $6,000,000 - $10,000,000 for both roofs (total price).
Unique Modern Design like the newly proposed Winnipeg Stadium Roof
- (for example) say $20,000,000.
Very unique elaborate design - $50,000,000 plus
At one time I thought that any large roof will be extremely expensive. Based on what I have read, this is not the case. In our case, the roof sections, although large, are not nearly as large as many stadiums throughout the world. I think that a roof completely covering the stands and extending right to the edge of the field will be very important for HRM stadium goers. If cost limited the stadium design to an internally supported roof with a few columns halfway up the stands (in the aisles to minimize obstruction) would this be acceptable? Similar to Fenway Park. Perhaps it could be internally supported with the possibility of becoming externally supported in the future (columnless design).
I think that this is an important consideration for the people on this forum, since when it comes time to design the stadium by the HRM, the design can be based on the wishes of the people who will use the stadium. If the cost choice is (a) a roof covering only half of the spectators in each section of stands using an externally supported roof or (b) having a few hundred (perhaps a couple thousand) slightly obstructed seats in the upper seats only but having cover for all the spectators -
which option is preferable? For me, I would pick (b) since the people paying the premium price in the lower bowl should expect to have cover from the elements. Personally, whenever I see a partial roof I think that the designers got it wrong since the ones paying the highest prices are the ones that will get soaked on a rainy day. This is just my opinion, I hope that I am not offending anyone.