Fence top trellis holding water = rot?

28 Mar 2011
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United Kingdom

We've bought some trellis to soften up the top of the harsh 6ft fence and put some climbers on too.

I noticed that the bottom of the trellis has a channel. There's no drainage so I'd assume this means it'll collect sitting water and promote (eventual) rot?

Is this nothing to worry about? Should I simply add drainage holes? Or even fill it in? (ideally not with 11x 6ft panels to go up!)

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If it's pressure treated and not in contact with soil, then it should last the usual 15 years that pressure treated timber is given.
It wouldn't hurt to put clear wood treatment in the channel then the end grain of the trellis will soak it up.
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timber will only rot at around a constant 19% moisture content hence why sheds and fence posts rot round the back or at ground level because thats where its held at the correct level for weeks on end

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