Yes you need side gutter’s to get water off you’re roof to street IMO. That could reduce you’re problem of standing water on saturated ground?
IMO the French Drain would carry the low spot water collection to street if gutters didn’t work? IMO house that 18 years old may have small foundation crack in foundation allowing water to wick up. Especially if the shower floor equal to or lower than the standing water outside the wall? IMO that’s the only way outside water on ground can work it’s way inside house from crack and wicking? Also IMO I wouldn’t want standing water close to foundation. Ground already saturated after heavy rains, it need to run off somewhere. Gutters may help????? And probably first cheapest option?
I have ask? Does your neighbor have gutter’s on that side?
One thing I like about CYVs they all have gutters all way around being the houses are so close. They also have back yard drains.
After thought? Next time you get down poor put some green dye in standing water see if you green water in you’re shower? If so you found the problem?
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