How best to waterproof this please?

[caveman]

I'm going to make the good lady a wall hung planter for herbs. It'll be wood so how best to waterproof it? Multi coats of varnish or some sort of pond liner type membrane?

 

[RobinBHM]

Pond liner defo

 

[Ozi]

I'd say both

 

[caveman]

Belts and braces! Cheers!

 

[Terry - Somerset]

Pond liner + drainage holes to stop it getting waterlogged.

 

[robgul]

Zinc sheet cut and bent to shape to form a liner (if she's worth it )

 

[Old.bodger]

As robgul says with all the joints fully soldered.

 

[Sachakins]

And drainage holes in the zinc.

 

[Henniep]

I'm going to make the good lady a wall hung planter for herbs. It'll be wood so how best to waterproof it? Multi coats of varnish or some sort of pond liner type membrane?

.......and don't forget to line the drain hole in the wood, or make the boxes without bases if you're going to line them with metal sheeting

 

[Simon89]

Does it need waterproofing?

 

[Sandyn]

It's a functional planter. I would just make it with treated wood and not bother with a liner. I use treated sarking for stuff like this. Get it really dry, sand the surface, then paint with outdoor paint. When you water the planters, it always overflows. They get 'grubby' very quickly.

 

[akirk]

I built this one earlier in the year - simple pine, then painted...
each trough was lined with a weed membrane type material stapled inside and then drainage holes created...
hasn't fallen to pieces yet! Comletely upright, but screwed through the garage to a bracing beam the other side!

 

[Lazurus]

EPDM roofing rubber, see if anyone local has some offcuts, use a good quality contact adhesive - the rubber has a lifespan of plus 50 years.