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Do you screen the drainage holes in plywood?

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Do you screen the drainage holes in plywood?

Post  dstack on 9/11/2013, 4:35 pm

I can't remember where on this forum I read this, about covering the drainage holes with screens. My neighbor is a carpenter who's been helping me brought over the plywood already drilled. The holes are bigger then 1/4", and are more like 3/4". It's no big deal as I have plenty of screens to use from our old windows that were replaced. I'll cover 'em up and screw it down to the plywood.My boxes will be mostly sitting on river rock, and I don't want to lose any of that precious MM!
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Re: Do you screen the drainage holes in plywood?

Post  bnoles on 9/11/2013, 5:31 pm

I used weed fabric over mine from the inside of the box and I would think window screen would work equally as well.  Sounds like you have got it going your way.  Cool

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Re: Do you screen the drainage holes in plywood?

Post  Marc Iverson on 9/11/2013, 5:57 pm

A friend of mine with raised beds had a critter come up through the drainage holes in the bottom and destroy his entire crop of beets. He was really bummed out, and afterward put some wire reinforcement over the holes and the entire bottom of his raised beds.
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Re: Do you screen the drainage holes in plywood?

Post  toledobend on 9/11/2013, 6:15 pm

I used weed block cloth on the whole inside bottom of my box.  I was concerned that the holes would get plugged and water log the plants.  My only concern with screen would be that the holes in the screen might be big enough to become plugged.
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Re: Do you screen the drainage holes in plywood?

Post  dstack on 9/11/2013, 9:21 pm

@toledobend wrote:I used weed block cloth on the whole inside bottom of my box.  I was concerned that the holes would get plugged and water log the plants.  My only concern with screen would be that the holes in the screen might be big enough to become plugged.
Interesting. When a neighbor warned me that weed matting is not water permeable regardless of the packaging claims, then I set out to disprove him, but he was right. The water just sat in it as if it was a sheet of plastic. Does it become water permeable once it's "broken in"? I wonder how long that takes.
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Re: Do you screen the drainage holes in plywood?

Post  sanderson on 9/12/2013, 1:57 am

Dstack,  I don't know how you did the experiment.  Weed cloth does let water through.  Weed matting may be a different product????  What is your product called?
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Re: Do you screen the drainage holes in plywood?

Post  dstack on 9/12/2013, 10:32 am

@sanderson wrote:Dstack,  I don't know how you did the experiment.  Weed cloth does let water through.  Weed matting may be a different product????  What is your product called?
I bought one roll of Jobe's basic grade and one of Jobe's premium grade, both from Lowes, and both claim to allow water to pass through. I tested both by simply cupping the fabric in one hand and pouring a glass of water into the fabric. Holding it for a minute there was not one drop of moisture passing. Perhaps I'll try a test where I'll place it over an open jar and let it sit for a while and see how long it takes to seep through.
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Re: Do you screen the drainage holes in plywood?

Post  sanderson on 9/12/2013, 1:06 pm

Try it flat like it will be i n your boxes.  There are tiny holes, right?  Just making sure you have the right product.  I'm keeping answers short while away from MY keyboard and mouse.
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Re: Do you screen the drainage holes in plywood?

Post  dstack on 9/12/2013, 2:46 pm

@sanderson wrote:Try it flat like it will be i n your boxes.  There are tiny holes, right?  Just making sure you have the right product.  I'm keeping answers short while away from MY keyboard and mouse.
I probably won't have time to test it out tonight. But I'm saying that I set out to disprove my neighbor who warned me about weed cloth and I couldn't. Sad  I watched in disbelief when I saw the water sit there even though I could see light through the cloth! I'll try again when I can.
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Re: Do you screen the drainage holes in plywood?

Post  walshevak on 9/12/2013, 4:02 pm

I have 10 tabletops that have hardware cloth bottoms. 6 are lined with the same plastic I use for my hoop houses with holes punched in the plastic and 4 are lined with weed block fabric with no holes punched. Both drain well, maybe if too well.

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Re: Do you screen the drainage holes in plywood?

Post  dstack on 9/13/2013, 9:28 pm

Now that my weed mat has been outside weathering the elements for a few days the water passes through with ease. When it's fresh from the packaging it's like oil in water.
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