Project and article
Repairing 4-inch sewer laterals in Boston
Long 4-inch laterals under Boston properties often need camera diagnosis, cleaning and trenchless renewal when joints fail but the pipe still has structure.
Why 4-inch laterals matter
Many Boston buildings discharge through 4-inch cast iron or clay laterals before tying into a larger main.
When that run is long, small offsets and root entry at hubs can cause backups far from the first fixture you notice.
Assessment and cleaning
Camera work maps length, material changes and defects along the lateral. Cleaning removes grease and roots so the recording and liner measurements are reliable.
If you already have footage, mention it when you contact us so we can plan whether a new recording is needed.
Trenchless repair options
CIPP installs a cured tube inside the lateral when diameter and access support structural renewal.
Brush coating may apply on short branches or sections where a full liner is not practical after camera review.
Access and interior finished space
Laterals beneath finished basements often renew through controlled interior access rather than trenching the full length.
We explain tie-in locations and fixture impacts before resin work begins.
Equipment context
4-inch lateral FAQ
How long can a 4-inch lateral be and still be lined?
Length limits depend on bends, access and equipment. Camera measurement and layout define what is feasible on your property.
Is excavation ever required on a 4-inch line?
Yes when the pipe is collapsed, severely offset or cannot be reached for installation. The camera guides that decision.