Hi, bought an older house built in 1952 and the basement drain always has cold air coming out of it. My first thought was the trap was empty and dumped buckets of water down it with no effect. Proceeded to pop the top off the drain and have a better look. Could see that the trap was full however discovered there was another 4 inch pipe coming in the side of the drain above the trap. After some investigating and testing I found out that it is a straight feed from my eavestroughs. My question is, Is there some sort of one way valve that will allow the water to flow through when it is raining, however closes up automatically when dry to prevent cold air from leaking into the basement.

I am having with my upstairs toilet. The bowl doesn't always clear, but usually in cooler weather. It works fine throughout the summer, but now that fall is here again, the bowl will only clear about 20% of the time. The other two toilets in the house work fine. Can anybody give me any ideas? It doesn't seem to be plugged, (I've used a plunger and a snake)