The sign is water that does not leave.
During rain, or with a hose at the outlet, look for water that stays in the gutter while the above-ground pipe should be open. Debris at the outlet, a crushed elbow, or a buried section that another trade owns can all do that. This page does not name oak, or any tree, as a measured cause. A site visit can see what is in the outlet. A species list cannot.
The existing size guide is the limit of the claim.
The published 3×4 and 4×5 question says a 3×4 is an oversized option on many qualifying systems, and a 4×5 may be evaluated where roof geometry, collection demand, outlet design, and the full discharge route support it. Size alone is not the fix. Placement, quantity, elbows, and the discharge still matter. No capacity number from a calculator was copied onto this page.
- Clear the outlet you can reach from the ground before you buy a larger pipe.
- Count the elbows. A larger pipe with the same crushed turn can still stall.
- Ask whether 3×4 fits the gutter outlet that is there.
- Treat 4×5 as its own review, not as the next automatic size.
Upsizing does not clean a buried line.
If the clog is past the point where the pipe goes underground, the buried section is the drainage trade’s work. PrimeFlow can record the gutter and the visible downspout. It does not jet a buried leader. A new above-ground size does not certify that the buried pipe is clear.
Practice follows the drawing in both markets.
Oversized downspouts are PrimeFlow practice only as the drawing shows them. Orlando requests use (407) 902-7639. Sarasota requests use (941) 404-3901. The same 3×4 and 4×5 distinction applies. The office does not.
Workmanship warranty
PrimeFlow offers a 7-year workmanship warranty. The terms exclude clogging from leaves, debris, nests, or lack of cleaning.
The estimate says which pipe is in the scope.
A free estimate can say whether the visible pipe is undersized for that roof, whether another outlet is the better change, or whether the clog is a cleaning item. It does not print a flow rate or a price on this page.
Sources and limits
A standing gutter does not name a tree as the cause, and this page does not publish a gallons-per-minute table.