Fibreglass pond/tank, how difficult to DIY?

Fibreglass pond/tank, how difficult to DIY?

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anonymous-user

Original Poster:

54 months

Thursday 18th April 2019
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Am looking at putting a rectangular pond in the garden, and have checked out the pre-formed ponds but the dimensions aren't quite right so looked at a custom made fibreglass tank which comes in at circa £800-1k for a 8x4x4. Plus extra for bottom drain, skimmer etc.

Like below:



Am assuming marine ply, bracing with wood, bit of angle iron, then 3-5 layers of fibreglass.

For this in the know, does this seem DIY able. Any tips?

Equus

16,872 posts

101 months

Thursday 18th April 2019
quotequote all
Yes, it's easily DIY'able... but fibreglassing is a messy, smelly job.

Wear old clothes and use protection (latex gloves/barrier cream).

Nimby

4,589 posts

150 months

Thursday 18th April 2019
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Why not use butyl rubber pond liner? Either a single piece and pleat the corners, or cut to fit and seal with the stuff they use for EPDM roofs.

dmsims

6,515 posts

267 months

Thursday 18th April 2019
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Nimby said:
Why not use butyl rubber pond liner? Either a single piece and pleat the corners, or cut to fit and seal with the stuff they use for EPDM roofs.
Is the wrong answer, you want a box welded liner

anonymous-user

Original Poster:

54 months

Thursday 18th April 2019
quotequote all
Nimby said:
Why not use butyl rubber pond liner? Either a single piece and pleat the corners, or cut to fit and seal with the stuff they use for EPDM roofs.
I thought of that, and a box welded liner, but the plan was to line the pond exterior with gaboon baskets, stuffed with York stone and I assumed that the possibility of puncture would be higher.

Like this:



With a Blade, fountain thing.



227bhp

10,203 posts

128 months

Thursday 18th April 2019
quotequote all
Forget it, it isn't viable for a one off.
They will have a mould, all the work is in the mould, you need multiples of items to make it worth while.

Turn7

23,604 posts

221 months

Thursday 18th April 2019
quotequote all
Vandenberg said:
I thought of that, and a box welded liner, but the plan was to line the pond exterior with gaboon baskets, stuffed with York stone and I assumed that the possibility of puncture would be higher.

Like this:



With a Blade, fountain thing.

Thats a great idea and could like very nice. I dont see why you couldnt use a box welded liner, if you doubled up on liner underlay it sohuld be absolutely fine.

Gareth79

7,664 posts

246 months

Thursday 18th April 2019
quotequote all
I've done fibreglassing of smaller stuff and it's pretty straightforward, most of my supplies came from MB Fibreglass (in NI). As mentioned it'll be very messy doing something that large, but definitely DIYable.

You should be able to work out the materials costs quite easily (don't forget brushes and cleaning materials, as well as wood etc for the former), it should only be a couple of hundred quid tops. Unless you have a burning desire to fibreglass, do think about just getting something ready made though!

Equus

16,872 posts

101 months

Thursday 18th April 2019
quotequote all
227bhp said:
Forget it, it isn't viable for a one off.
They will have a mould, all the work is in the mould, you need multiples of items to make it worth while.
All the work in traditional mouldmaking is to get a surface finish that:
a) The moulded part will release from and;
b) Gives a nice smooth finish to the final part.

If you're not particularly fussed about either, and are happy to make a mould that is 'sacrificial', it's a lot quicker and simpler.

227bhp

10,203 posts

128 months

Thursday 18th April 2019
quotequote all
Equus said:
All the work in traditional mouldmaking is to get a surface finish that:
a) The moulded part will release from and;
b) Gives a nice smooth finish to the final part.

If you're not particularly fussed about either, and are happy to make a mould that is 'sacrificial', it's a lot quicker and simpler.
Having done a lot and knowing a lot about it I can advise it isn't worth setting up for a one-off.
It's case of if you have to ask, you shouldn't be going near it.

Equus

16,872 posts

101 months

Thursday 18th April 2019
quotequote all
227bhp said:
Having done a lot and knowing a lot about it I can advise it isn't worth setting up for a one-off.
It's case of if you have to ask, you shouldn't be going near it.
I've done a fair bit myself - including mouldless construction (which is effectively what I'd be looking to do for something like this).

It's only complicated if you choose to make it so.

How much time do you think fibreglass flat roofers spend on making moulds? wink

anonymous-user

Original Poster:

54 months

Thursday 18th April 2019
quotequote all
227bhp said:
Forget it, it isn't viable for a one off.
They will have a mould, all the work is in the mould, you need multiples of items to make it worth while.
Can I ask why you state it isn't viable? is a mould totally necessary or can I just build a box and fibreglass the hell out of it.

This isn't the start of a fish farming set up, it's just a rectangular pond with a fountain and a dozen sarasota goldfish and some lilies and I was hoping I could hide any imperfections and the pipework with the gabions.

Thanks for all the other comments, I will price up a box liner, with liner vs DIY Fibreglass and just buying one. But first I need to shift a bunch of plants and soil, which is this weekends task.



Equus

16,872 posts

101 months

Thursday 18th April 2019
quotequote all
Vandenberg said:
...just build a box and fibreglass the hell out of it.
This.

No point in building a fancy mould, for a one-off job that doesn't need a particularly high standard of surface finish.

You're effectively doing what you would to sheath a flat roof or a wooden boat with fibreglass, except your intention is to keep the water in, instead of keeping it out.

Google will find you various guides to either task, but it's not complicated - just sticky, messy and smelly.

stevemcs

8,660 posts

93 months

Friday 19th April 2019
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I'm building a L shaped pond and going down the route of a box welded liner its around 2.5mtr x 2.0 x 0.8 and 0.45 deep and its looking around £500 if that gives you something to go on.

anonymous-user

Original Poster:

54 months

Friday 19th April 2019
quotequote all
stevemcs said:
I'm building a L shaped pond and going down the route of a box welded liner its around 2.5mtr x 2.0 x 0.8 and 0.45 deep and its looking around £500 if that gives you something to go on.
Thanks it does, are you going for a bottom drain?

stevemcs

8,660 posts

93 months

Friday 19th April 2019
quotequote all
Nope, its more decrotive than a pond but will have some fish, its only 450mm deep the house is of the generation where everything is dumped in the garden and then 150mm of top soil added.



Edited by stevemcs on Friday 19th April 16:11

myvision

1,943 posts

136 months

Friday 19th April 2019
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I built a pond 5mx3m and 1.7m deep in block and brick.
The cost for a proper firm to come and fibreglass it was £1k I thought if I used a liner one cut wrong around the bottom drain, skimmer or any of the returns would put me over the cost of fibreglassing it.