Water trapped in the inner hull

Moon Loon

Registered Member
Premium Member
City
Levis
State
Quebec
6 years ago, I installed a bow 24 volts Minn Kota on my 195CC. I already had two batteries in the storage underneath the console so I decided to store the batteries and a Minn Kota inboard charger in the front bilge that is too wet and dirty to store things you want stay dry and clean like spare cloths, rain suits or PFDs.

I made a tray with Kingboard to hold in place the two batteries and the charger for my MinnKota . I never had issues with the batteries and the charger even in rough water but I made the mistake to secure the tray with two screws on the inner hull. Two years ago I decided to move the tray farther on the front bilge for easy access issues. At winterisation I never noticed any anormal presence of water in the inner drains but this summer when I cleaned the boat. I noticed that there was water level to the top of each one of the two inner bilge drains. I checked all the accessible part of the inner hull reaching a way to this water to enter in the inner drain and unscrewed the tray in the process. I seen that there was water pouring from the screws holes.
I drilled a 1/4 inch hole on the bilge floor to drain it and water spurted out hardly for a while indicating that there was some pressure even with the inner drain opened for months and the bow raised to make all water escape through the inner drains and the hull drain. When it stopped, I putted my weight on the floor and water started to spurt out again. After that, I flushed as much water I could with my air compressor but the floor of the bilge was raising under the air pressure without any water coming out from the inner hull drains. So I drilled a second hole on the back of the rear front bilge to make a way the water to escape more freely. Then I welded all the screw holes and had a lot of problems with the last one for there was always water in the plastic solder. I was sure that all the screw holes look well soldes and there was no way for the water to come into the inner hole from there... and no way to escape from there too.
Yesterday I was working on the boat and I checked the solders with a paper towel and there was still a very small amount of water coming from the two back solders indicating that there was still some pressure and some water quantity in the inner hull despite the inner hull drain remained open. I inserted blue mechanic paper towel in the drains to make wicks and after a while, they were completely soaked.
What bugs me is what the water was not coming out from the two inner drains considering that the bow of the boat was by far higher than the stern since last september. It seems that something stops the water to go down from the bow to the inner drain and come out of it. I let them open and will see what happen after a week.

We had a very bad winter here in Quebec. By far worst than usual. We had at least three episodes of warm weather with heavy rain followed by extreme cold fronts downing temperature around -15 F and strong winds that damaged the tarp covering the boat but not enough in my mind to let all this water enter through this smalls screw holes. Unfortunately, I spent all the winter in Florida so I don't know how much water from this heavy rain got through the tarp inside the boat.

Can somebody give me a hint on why this water stay trapped in the inner hull and how to solve this issue? I am not very willing to install a drain from outside the hull.
 

Offshoreman

Recognized Leader Triumph 235 Forum
Lifetime Member
Premium Member
City
North Coast
State
CA
The drain installation on the transom is the solution.

How water gets in can be failing sealant on a fixture (rod holders, around a screw, etc), or a number of small things. Even my neighbors Boston whaler developed water in the inner hull. I don't know of a double hull boat that is immune.

Installing the inner hull drain will rid your boat of trapped water and give you the ability to regularly drain and keep it out.
 

Moon Loon

Registered Member
Premium Member
City
Levis
State
Quebec
You mean installing a hull drain outside the hull or another drain inside where there is already one on each side of the hull?
 

Offshoreman

Recognized Leader Triumph 235 Forum
Lifetime Member
Premium Member
City
North Coast
State
CA
Outside, on the lowest place on the transom. Look for inner hull drain threads here and use quality materials and it will be one of the better improvements on your boat.
 

Moon Loon

Registered Member
Premium Member
City
Levis
State
Quebec
Thanks Offshoreman, I do that. With my Shopvac and an home made reducer to 1/4 inch pipe I removed one gallon of water from the inter bilge and by lifting the bow with a jack all, another gallon went out through the hull drain. I don’t really understand why this water was trapped all the time the boat was stored with the bow up.
Maybe the angle.
 

Push&Pull

Recognized Leader Triumph 210 / 215 Forum
City
Florida City
State
Florida
If you look at a cut-a-way of the hulls below the deck, you will see that the structure is in the form of a grid to provide more structural integrity. However that grid also can trap water and eventually the foam will begin to absorb it adding to the problem. There isn't really a complete and total solution. All you can to is just add as many drains as you can get to and hope the water makes it way to any below deck bilge pumps or transom drains.
 

Moon Loon

Registered Member
Premium Member
City
Levis
State
Quebec
Than to share your experience Push&Pull.
When I look inside the bildge I can see that the two inner hull drains are located above the bottom of the inner chanel to the bilge drain so it is impossible to drain completely the inner hull at least for the part beetween the inner hull drains and the main hull drain. I could add two more drains just at the level of the hull drain chanel with a 90 degrees drill extension to help drain the inside hull. And install one or two outer hull drains for the part of the inner hull that would remain under the added inside drains. In my mind, the most tricky to install would be the outer one because I will have to guess the thickness of the outer hull to locate where to drill for the drain.
I don’t know exactly how the grid is designed. Is there a way for the water to drain from each side to the center of the inner hull? Do you think it would it be necessary to add a drain on each side of the outer bilge drain?
And is there a compartimentation beetween the bow and the stern that fouls restrain the drainage of the inner hull from the front inner hull?
 

Moon Loon

Registered Member
Premium Member
City
Levis
State
Quebec
I finally got the drains for my inner hull water issue. I read on other posts that drains should be installed on 210 two inches above the bottom edge of the transom and one inche right or left of the center line. Can I use theese measures on my 195CC?
 

Moon Loon

Registered Member
Premium Member
City
Levis
State
Quebec
Finally the job is done. Only a few drops of water went out but if necessary, I can drain outside my inner hull. IMG_3821.jpeg
 
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