The problem is while they are stuck up there they form a kind of mat and block the water from going into the foam.
Future foam gutter snow.
As you can see from the photos here leaves pine needles and roof moss do not blow away with the wind as claimed by the manufacturer gutter stuff instead they compact into the foam filter and create a barrier preventing rainwater from entering the gutter instead it just overflows the front of the gutter.
It gives us a good chuckle when we see a gutter filter with a 3 5 or 15 year warranty or something like that.
Product comes in 4 ft.
The problem with foam gutter filters.
Sections made from polyether outdoor durable foam this lightweight insert won t crumble dent bend or cave in allowing for satisfied customers.
The foam is very porous and so water soaks in and travels through the gutter unobstructed.
But even the best gutter filter foam inserts rarely last more than a year or two before their top surface is complete trash.
What you need to hear.
It also prevents mosquitoes from breeding in the gutter.
The fact is polyether or polyurethane foam is just foam.
No other gutter cover screen or guard system works as effectively to keep debris from entering the gutter.
Leaves might get hung up for a while but they are supposed to eventually blow off.
This is a very good solution for places where there isn t a lot of small especially granular debris though it will probably work well at the beach too.