wasps in chimney top

I have a two storey house. The wasps appear to be nesting in the top of the chimmney. The chimmney is not used and is sealed off in the old fire place. What is the best way of discouraging them?
Thank you.

For some reason wasps seem to love chimney's. It seems like half of the nests I find on homes are on or alongside chimneys. It could be due to the all the "extra" lumber and framing common to this area on the home. Or it could be the air space is warmer behind the siding and therefore the external siding is  slightly warmer outside which attracts pests. Regardless, this is a common location to find wasps and in many cases a tough one to treat because it's high and inaccessible.

In most every case, there are two things I like to do when I see wasps foraging and active in this location. Due to the seams and spaces commonly found around the average chimney box, I like to first dust the area with some DRIONE. Since the location is almost always high, the use of a DUSTICK will be a big help. At this time I always recommend dusting around all the gutters in the home too since they will commonly attract pests and if you doing a little dusting, treating all the way around the home makes sense since it's so effective.

In most cases the dust is all that's needed and if done right, you'll not only stop the current activity but you'll effectively be stopping them from coming around again in the fall. But I do like to spray some CYPERMETHRIN over the top as a kind of "extra" protection. With the use of our TROMBONE SPRAYER, you should be able to reach 25-30 feet up there and this extra spray may be needed if you weren't able to dust every area and you're still seeing activity 2-3 days after the dusting is done.

Here are direct links for the products mentioned above:

Drione Dust:  http://www.bugspray.com/catalog/products/page256.html

Dustick: http://www.bugspray.com/catalog/products/page1413.html

Cypermethrin:  http://www.bugspray.com/catalog/products/page154.html

Trombone Sprayer:  http://www.gotosprayer.com/sprayers/pump-sprayers/trombone-pump