A plumber would probably have a more indepth response, but I'd suspect 1 or more blocked plumbing vents - check every vent on the roof, make sure they are not blocked with anything.
If that's not the issue, suspect bad plumbing, but that should have shown up as an issue when the house was built.
Sponsored Stories
Get the latest This Old House news, updates and special offers every week,
direct to your inbox.
TV Listings
Find TV listings for This Old House and Ask This Old House in your area.
Be the First!
Enter your email to watch these three EXCLUSIVE sneak peeks from This Old House TV
By submitting your information, you're agreeing to receive communications from This Old House in accordance with our Privacy Policy.
A plumber would probably have a more indepth response, but I'd suspect 1 or more blocked plumbing vents - check every vent on the roof, make sure they are not blocked with anything.
If that's not the issue, suspect bad plumbing, but that should have shown up as an issue when the house was built.