Pontoon Drain Holes

[Troyvan]

Hi All,
Looking at purchasing a 1975 Trillium and noticed a 1/2” drill hole on the underside of the trailer shell, beside the door, drilled into the “pontoon”. It looks to me like it drains any water that collects inside the trailer from leaks, spills or condensation.
I saw online on one of “Slim Potatoehead”’s YouTubes, that he actually drilled a 1/2” hole in each pontoon section, (4 in total), then covered them with steel screen to keep wasps out.
Was wondering if anyone else had drilled in drain holes, or had any comments on this topic.
Thanks

[thrifty bill]

Hopefully Slim did not drill a 1/2 hole, as mice can easily pass through that size. Myself, I don't go over about 3/16. But yes, each pontoon section needs a drain hole. If the pontoons fill with water, it will reach the plywood in the floor and then rot begins.

[Capn.Curt.Wiebe]

The holes I drilled are also about 3/16", but I didn't put in any mesh. If you are putting a mesh there, make sure that it's metal!

Also, there are 4 holes required, one fore and aft of each wheel well.

[David Tilston]

If they didn't have holes to begin with, I drilled them. Some had so much water in the pontoons that they drained for quite some time. I don't know why Trillium didn't do this at the factory.

[Troyvan]

Thanks everyone for your suggestions. I plan to drill in 4 - 3/6” holes to drain any existing accumulated water and keep them clear for any future water ingress. Cheers

[David Tilston]

3/6"? Do you mean ½"?

[Troyvan]

Oops,typo.
I meant 3/16”. I have heard 1/2” for better drainage, but you have to attached screen over holes to stops critters from entering, I went with smaller holes (3/16”) and no screen