Finding hairline crack in tub

The only way to resolve this..is to beef up the supports under the tub area. Some units a person can actually access, most however require removal of the whole shebang, then you add supports and put in a new one.

There have been suggestions of getting some of that expandable foam insulation, cutting a series of holes to accomodate the tube, and fill'r up.

I would think that with the wet wood? you need to dry that or face the propect of rot.


Gary Haupt

You have answered your own question:

"a hairline crack in our tub or shower surround. We are getting some wet wood under the tub"

Or it may be leaking around the drain flange or the supply lines.

PastorCharlie wrote:
You have answered your own question:

"a hairline crack in our tub or shower surround. We are getting some wet wood under the tub"

Or it may be leaking around the drain flange or the supply lines.

Drain flange is bone dry. I am getting water on the wood directly below the tub on one side, opposite side and about 5" in front of the drain flange.

Put some of the blue "duck" toilet cleaner in a couple of inches of water in the bottom of the tub. Let it sit for a few hours and if possible flex the bottom of the tub such as when you are in it. If there is a hairline crack the blue will collect in it leaving a darker blue line. Just rinse the tub later to get rid of the blue--after marking it with a grease pencil.

stubs has a plan also check the shower fitings on the back side of the unit ,yep won,t be fun geting to them, but you gotta check the simple things first. most tubs don,t crack ,its coming from some place else.. but it could be a crack .

I spoke/typed from personal experience. When they build these things, they often don't put enough support under the pan and they do crack. If you stand on the pan in bare feet..does it feel all nice and soft? If so...not enough support and it cracked.



Gary haupt

stubblejumper wrote:
Put some of the blue "duck" toilet cleaner in a couple of inches of water in the bottom of the tub. Let it sit for a few hours and if possible flex the bottom of the tub such as when you are in it. If there is a hairline crack the blue will collect in it leaving a darker blue line. Just rinse the tub later to get rid of the blue--after marking it with a grease pencil.

Good idea. Seems hard to find this product. Can I use any liquid toilet bowl cleaner? My tub sits perpendicular to the wall. The faucet is on the interior side of the camper. O water drips from the faucet. My first thought was it was leaking at a fitting where the lines would branch off the main line to run the supply lines to the faucet. It still could be this so I will try to pressure test the lines as well. Tks

If you remove the tub check the height carefully of all supports. Our tub has cracked and been replaced twice before we realized, with some members help here, the rear supports in the corner were 3/4" higher than than the front!

As a result, the tubs were not sitting flat on the pedestal. The rear side was not contacting the pedestal, and in essence, not supported. The constant flexing of the tub during use led to cracks. With both tubs the cracks appeared in the exact same place.

Dog Folks wrote:
If you remove the tub check the height carefully of all supports. Our tub has cracked and been replaced twice before we realized, with some members help here, the rear supports in the corner were 3/4" higher than than the front!

As a result, the tubs were not sitting flat on the pedestal. The rear side was not contacting the pedestal, and in essence, not supported. The constant flexing of the tub during use led to cracks. With both tubs the cracks appeared in the exact same place.

Tks. Will keep that in mind if I have to remove it. Were your cracks visible or did you have to perform a test to find them. I can't see any with my naked eye and an LED flashlight.

Cecilt wrote:

Dog Folks wrote:
If you remove the tub check the height carefully of all supports. Our tub has cracked and been replaced twice before we realized, with some members help here, the rear supports in the corner were 3/4" higher than than the front!

As a result, the tubs were not sitting flat on the pedestal. The rear side was not contacting the pedestal, and in essence, not supported. The constant flexing of the tub during use led to cracks. With both tubs the cracks appeared in the exact same place.

Tks. Will keep that in mind if I have to remove it. Were your cracks visible or did you have to perform a test to find them. I can't see any with my naked eye and an LED flashlight.

Mine were visible. About 6 inches long. Maybe because we are a family of three "heavy weights" and use the trailer full time, thus lots of showers.

You also can try running your fingernail, lightly, over the suspected area in both directions. Sometimes an invisible crack will "catch" the nail.