Wednesday, August 29, 2007
CS/AT- Typical parapet detail (sketch 1)
Behold my masterpiece below..... this is a ROUGH sketch of what I think my typical parapet detail is going to look like.... this is based on the wall system that Wagdy Anis went over with us which consists of a continuous moisture barrier in the envelope... one thing I am still working out is how to tie the concrete panels back to the steel without causing too many major thermal conductors.. I know that, with a masonry veneer, I could tie back into the stud framing... but I am not sure if that is possible with full concrete panels... I am going to talk to some of our structural engineers tomorrow, but if anyone can shed any light it would be most appreciated....
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9 comments:
Is this parapet detail on the circulation spine? Are you planning precast panels for the north side of the building, and is it for sound control or something else? Do you have anymore ideas for the materials on the lower portion of the building (green roofed part)?
Anne, yes this is intended for the circulation/core building. I think that I would like to use some type of metal siding for the classroom wing. something akin to the storage containers... I do plan to use the pre-cast panels for the entire core building though... I want it to have the appearance of being "substantial" and "heavy" and I think that the pre-cast panels might do that??
Anne, thanks for commenting. If Peter answers you (maybe even with some more sketxhes) I don't have to bug him.
Peter, make sure you understand the construction process: most precast panels act like a beam hanging between columns. The panels go onto the building right after the steel is up. Adjustments need to be made from the inside. Because of that insulation and back-up need to go on after. Check out the following web page for some more precast info: http://www.wbdg.org/design/env_wall_precast_concrete.php
http://www.wbdg.org/design/env_wall_precast_concrete.php
http://www.wbdg.org/design/
env_wall_precast_concrete.php
I' m starting to hate this blogging thing. How ristricting. GRRR
Thanks for the link.. I was looking at that site yesterday.. I am starting to think that, because the panels need to be directly connected to the steel frame, there is no way that I can have both the pre-cast panel and the continuous insulation and moisture barrier as every connection will be a thermal bridge. They seem to counter act each other.. None of the details I have seen, or the engineers I have spoken to, seem to have a solution for this.
I still want to use a concrete product for the core building to achieve that thick, heavy feel. I could look at some type of CMU, as this could tie back into the studs with masonry ties and leave my envelope alone. I am much more familiar with this type of wall system.
Any thoughts???
Werner is right. If the precast is not stone size pieces, then it cannot be reasonably fastened as a veneer or rainscreen. It gets fastened from the back to the structure. It then gets insulated from the back, these days, spray polurethane foam is becoming popular for that. The sealant joints in the precast are double with the back seal being wept out from time to time.
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