my first ever pond build


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Hi please see attached picture of my build my question is so I need some sort of ply wood for the inside before the underlay thanks for any advice given
 

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sissy

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doesn't hurt to add it .It will give the pond more support on the longer sides
 
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addy1

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Nice pond box you have there!

Welcome to our group!
 
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Thanks for the welcome:) I went to Atlantic timber to get ply wood that way I no for definite it’s been cut square and true unfortunately when I placed it in my pond it’s showing me I have a gap of about 10mm I’m one corner so obviously my wood work skills isn’t the greatest:( do you think I would get away with that gap if not hopefully someone could come up with a way of sorting it without it’s costing me another £35 for 1 sheet of ply
 
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If I understand correctly the entire bottom is covered with plywood with the exception of 10mm gap in the corner.

If that is correct I think that would be fine with my only concern is if there was metal strapping not covered in that gap.

I'm assuming the strapping is for additional support and not the only thing holding your 4x4's together.

I'm relatively new to pond construction so you may want to hear from a more seasoned member.

Looking forward to seeing the final product.
 

addy1

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I don't think it would matter, that is a small gap. But others might disagree.
 

sissy

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depends on roughness of the plywood edges ,just like rocks being pointed and rough can cause a problem .You could caulk the edges of the plywood or sand the edges smooth
 
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as im also on my first pond ever hello and welcome to the forum
but if you centre the board that will only be 5mm either side and you could fill the gaps with sand or conceal them with some
beading either way i dont think it will make a difference as your putting underlay on it
heres a link on constructing timber framing a tank
you can then say its an expansion joint for the plyboard
 
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Thanks think I’ll go for a bit of sand in the edges thanks for all the reply’s you’ve been very helpful
The hole thing has just over 500 screws and 40 coach bolts in each end panel of wood and metal strapping and obviously the not so tight fitting ply board lol hopefully it will hold out a couple of years before it starts to bow out underlay and liner comes on Wednesday then the water test lol I’ll post a couple more pics as I go if you don’t mind then if I’m doing wrong someone can pull me on it and put me in the right direction
 
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just one thing before you go are you intending on using a tank or a butlyn (i think thats what there called)liner
 
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Yeah it’s the butlyn if that’s the correct term of it lol I’m actually brushing up on how to form the edges of the liner as I never done this before
 
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what size timbers did you use on the frame, as i just read a brick and mortar frame approx 3 ft-4ft high needs backfill with earth to support it on the outside (dry side)
just saying though and something to consider
 
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I used 3x3
6ft long 3ft wide 2.5ft deep I also read that after 3 ft deep things change quite a a lot in terms of supports so I keep to just under that but time will tell I think
 
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why take the risk with time as time will always win the future always beats the past
why didnt you opt for in the ground pond( plenty of support there and only takes a few hrs to dig the hole) then with a raised bog that can spill over in to your pond via a waterfall and can be planted also ,thats what i intend on doing with some advice here ,
do ya here me im only signed on here 2-3weeks lo,l and already im giving ideas and advice
 
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YouTube King of diy, he built a pond like that. In his fish room! You wouldn’t need the foam insulation under it, but you can get an idea if the sides will hold up.
 
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heres mine so far after a week so keeep up the work

119853


119854
 
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