Some of you have seen the bird houses I built. Every year we get birds, but every year wasps make nests in the houses. Even if the birds have a nest, they run them off or kill them. I've experimented and have finally found a solution. I bought some thin Teflon sheets and put them on the underside of the roof, figuring that if their nest can't stick to the roof, they won't build. I have 5 bird houses and 4 had birds, no wasps. One I forgot to put it in had a BIG wasp nest. (Teflon spray did not work)

 The other big problem is hail, we've had it as big as baseballs and it can destroy a house with a direct hit.

Cool idea on the Teflon 

Thanks for the hint. Somehow, my birdhouses don't have the character your's have. 

2 hours ago, Ron Altier said:

I bought some thin Teflon sheets and put them on the underside of the roof,

Great idea & solution Ron.

Out of curiosity, where did you get the thin sheets of Teflon? Locally or special order?

When you describe thin, approximate thickness?

Teflon spray Dave.

1 minute ago, It Was Al B said:

Teflon spray Dave.

I think he indicated the spray didn't work Al...

Totally unrelated, but I found using Olive oil spray on the hangars for my hummingbird feeders keep the ants away & out

2 hours ago, Ron Altier said:

...I bought some thin Teflon sheets ....(Teflon spray did not work)

 

My bad.  And baseball size hail will damage more than a bird house.

1 minute ago, It Was Al B said:

And baseball size hail will damage more than a bird house.

Yep...hope I never see that except on the news in a far far away land.

8 hours ago, Grandpadave52 said:

Totally unrelated, but I found using Olive oil spray on the hangars for my hummingbird feeders keep the ants away & out

Very cool birdhouses @Ron Altier

 

I have not had much trouble with wasps, but I will sure try this out for the hummers.

Thanks @Grandpadave52

Those are some pretty nifty bird houses.  Great idea with the teflon - I have not had too much issues with wasps or hornets - but did have a mouse nesting in one of my houses a few years ago - that was a shocker when I opened to clean - to see those eyes looking at me - LOL!