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  1. #1

    Fiberglassing pond

    With the crap going on in the world at the moment I was planning on redoing my pond over the next coming weeks.

    I could use some help from you guys.

    I panic bought enough fiberglass kit for the job last week luckily without thinking much about it as I wanted to ensure I had it.

    Now Iíve worked out the amount of concrete mix I need and itís gonna cost 700 plus quid in materials.

    Is there any way to fiberglass a pond in the ground without concrete and still be good?

    I have enough fiberglass matting for 2 layers of 450g mat and 1 layer tissue does it need concrete?



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  3. #2
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    My inexperienced opinion is yes it does need concrete.

    2x450 matting is normally used with a concrete fixture.

    But, saying that I know of an experienced resin manufacturer who said matting can be laid on clean soil but he didn't go into detail.
    I believe the same if enough layers of matting is laid.

    Look at the free standing glass systems available so it can be done but dont know how much matting is needed.
    John

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  5. #3
    Senior Member Rank = Rokusai samp09's Avatar
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    how big is the base you need?

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  7. #4
    The base is only 1m wide by 2m wide at one end and gets bigger at the other end like a P shape.

    2m x 2m at the other end then a large shelf.

    But I worked out for a 2 inch think base and walls Iíd need around 2 tons of sand and 500kg of cement based on the sand bulk half ton bag saying it covers 10sqm at 25mm thick

  8. #5
    Senior Member Rank = Rokusai samp09's Avatar
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    Quote Originally Posted by Steve9814 View Post
    The base is only 1m wide by 2m wide at one end and gets bigger at the other end like a P shape.

    2m x 2m at the other end then a large shelf.

    But I worked out for a 2 inch think base and walls I’d need around 2 tons of sand and 500kg of cement based on the sand bulk half ton bag saying it covers 10sqm at 25mm thick

    Don't need anywhere near that. My base was 20+cm thick and 3.8m x 3m. If I remember correctly it was 2 sq cubes of concrete which was delivered to my house in a mixer lorry and with the help of friends we wheel barrowed it around the house straight into the pond. I had leftovers too and done a thin layer in the filter pit. That was about £240 worth of concrete so worth looking into. even with it pumped around?over the house for a base that size it would still be less than £700.

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  10. #6
    Senior Member Rank = Grand Champion Ajm's Avatar
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    700 is well outside what it should be . Think around here its 125 a cube delivered

    Sent from my SM-G973F using Tapatalk
    Johnathan

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  12. #7
    I donít have a way to get to my garden other than through my house and into the garden which involves 3 doors and 3 turns and a 4th turn in my garden to my pond.

    I donít think a mixer truck will wait on my front for the possible hours it takes me to wheel it through my house. Hence I was considering mixing myself.

    How do I work out how much sand/cement I need to mix myself? And how thick should the base and walls be?

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  14. #8
    3.8m x 3m x 0.2m thick is just the base right what about the sides?

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  16. #9
    Senior Member Rank = Rokusai samp09's Avatar
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    Quote Originally Posted by Steve9814 View Post
    3.8m x 3m x 0.2m thick is just the base right what about the sides?
    I built the sides up with blocks laid flat. I believe a pump will actually go over the house but might be wrong. If I remember correctly the mix for concrete is 1 part cement 2 parts sand 3 parts gravel.
    so if your buying it individually and need 500k of cement you would also need 1 ton of sand and 1.5 tons of gravel if my maths is correct at this hour

    to see how I built mine this is my build page https://www.koiforum.uk/pond-constru...ild-diary.html

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  18. #10
    Do you need to render the blocks afterwards?

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    Senior Member Rank = Rokusai samp09's Avatar
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    Quote Originally Posted by Steve9814 View Post
    Do you need to render the blocks afterwards?
    If you are fibreglassing, then its best to render the inside or insulate as it will give a far better finish with the fibreglass. If you are planning a window then you can use a recess cut into the insulation as a seat for the window to sit in too. I got my insulation from this company, it was about £7 per sheet including tax of celotex because they are factory seconds.
    Economic Insulation | Insulation Board | Loft Boards | Wall Insulation Board
    I used Q board washers on normal long screws with rawl plugs on the inside of the pond to hold the celotex in place nice and tight although some people use things like pink grip etc.Even if you don't plan to heat, you may change your mind one day so for the extra bit it will cost to celotex it will be worth having it there, also at that price of £7 per sheet I would imagine its actually a lot cheaper than to pay for the materials to render/pay someone to render.

    Again, its all on my build thread In pictures, thats the best place to get ideas when building. I spent hours looking over build threads on Facebook etc to get my build right and so far I cannot thing of anything I would change on my build, other than maybe building the filter house before finishing the rest of the pond however my plans for filtration changed regularly and I plumbed it in so I can change it without much issues in future if need be.

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  22. #12
    I donít want to insulate as I donít want my temp getting too hot in summer. I know this is a koi forum but I keep Trout .

    I guess I will have to figure out how I am going to concrete it all then

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  24. #13
    Senior Member Rank = Rokusai Steve1984's Avatar
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    I didnt render my blocks before I had the pond glassed, with the algae on the walls and the fish swimming around you can hardly see that the pond hasn't been rendered. Ponds been wet less than a year so as more algae grows you'll see even less, although I'm now moving so will have to build a new pond

    Sent from my SM-G977B using Tapatalk

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    Senior Member Rank = Rokusai samp09's Avatar
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    Quote Originally Posted by Steve9814 View Post
    I don’t want to insulate as I don’t want my temp getting too hot in summer. I know this is a koi forum but I keep Trout .

    I guess I will have to figure out how I am going to concrete it all then
    Insulation doesn't add heat to the pond, but yeh if your not too worried about the finish then will be fine fibreglassing over blocks

  27. #15
    I know it doesnít add heat but the summer sun will heat the pond much more efficiently with an insulated pond increasing water temp.

    Oh I didnít realise it was just the finish that was the concern.

    How does glassing directly over blocks make the finish worse? Wouldnít the surface still be flat since were spreading the glass flat?

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    Senior Member Rank = Rokusai samp09's Avatar
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    Quote Originally Posted by Steve9814 View Post
    I know it doesn’t add heat but the summer sun will heat the pond much more efficiently with an insulated pond increasing water temp.

    Oh I didn’t realise it was just the finish that was the concern.

    How does glassing directly over blocks make the finish worse? Wouldn’t the surface still be flat since were spreading the glass flat?
    it hugs the contours so will show all the blocks and where the mortar is etc.with insulation it is obviously smooth. Have you fibreglassed before?

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  31. #17
    Nope never fiberglassed before but got plenty of free time atm so watching lots of videos and I have plenty of fiberglass here to do multiple coats if I need to

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  33. #18
    Senior Member Rank = Rokusai Sim's Avatar
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    Think if it was me I would just stick 25mm insulation it would make it a lot easier which may be the make or break if you haven’t glassed before.
    on my pond extension I shuttered and pored the walls and glassed straight on

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  35. #19
    Senior Member Rank = Rokusai samp09's Avatar
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    I mostly used 12mm with no issue

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  37. #20
    Senior Member Rank = Rokusai Sim's Avatar
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    Didn’t even know the did it that thin samp, perfect

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