I have those too. Looks like they made a nest in my overhang by my patio door. What are they and how do we get rid of them? They swoop down towards you as if warning to keep away. I would really like to enjoy my backyard without screaming and dashing into the house all the time! My roof is new by the way, so it can't be the roof.
I think they are called "spider wasps" go to www.pestcontrolcanada.com They will have pictures. I think the bluish wasp are quite harmless unless you disturb their nest. They most often are solitary wasps. They are carnivores. They eat spiders. Often time taking over the spiders' own home and eats him/her. From I have read about them , they are not that aggressive toward humans.
We have insects like that around here. I think they may be blue wasps. Yes, they can sting! They like to build nests in attics, garages, under the edge of roofs etc. I'd buy a can or two of wasp spray and take good aim and fire away!
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