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  1. #1
    Senior Member Rank = Yonsai davethefish1's Avatar
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    Fish Flap and roof insulation

    with the cold weather we've been having recently,
    there's been a lot of condensation on the inside of the filter house roof, the wood was wet and starting to get black mould spots.

    so after drying it out with an oil filled radiator over night.
    i sealed it with wood stain, then insulated it it with 50mm celotex.

    Fish Flap and roof insulation-roof-insulation-jpg


    the fish flap
    was already done but makes it so much easier to feed the fish...

    Fish Flap and roof insulation-fish-flap-jpg

    fish flap.jpg


    Attached Images Attached Images
    You don't have to be a pipefitter to keep koi...
    but it helps...

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  3. #2
    Senior Member Rank = Nanasai smartin's Avatar
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    Hi Dave,

    the flap looks great, how did you do that?? I could do with one myself to save keep lifting up a whole section of polycarb each time I visit the pond to feed them, been using that celotex myself seems to be a good insulation....

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  5. #3
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Nice one Dave nice and neat

    Sent from my SM-G960F using Tapatalk

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  7. #4

    Fish Flap and roof insulation

    Also interested to know how the flap is hinged, I thought of adding a flap but did not want to make a rash decision and regret it. IMG_2388.jpg

    I have to prod it open with a piece of wood, not ideal



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    Last edited by Mikeh83; 04-12-2019 at 10:08 AM.

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  9. #5
    Senior Member Rank = Yonsai davethefish1's Avatar
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    Quote Originally Posted by smartin View Post
    Hi Dave,

    the flap looks great, how did you do that?? I could do with one myself to save keep lifting up a whole section of polycarb each time I visit the pond to feed them, been using that celotex myself seems to be a good insulation....

    Quote Originally Posted by Mikeh83 View Post
    Also interested to know how the flap is hinged, I thought of adding a flap but did not want to make a rash decision and regret it. IMG_2388.jpg

    I have to prod it open with a piece of wood, not ideal


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    pretty easy, i just cut the flap with a fine toothed jigsaw, sanded the cut edges and hoovered out the swarf.
    then used '3M venture all weather tape' to make a hinge and seal the cut edges.
    the tape seems to be holding up ok so far...

    here's where i got the tape from ( i got the 75mm x 25m)

    https://www.hadleigh-tapes.co.uk/new...e_2779555.html

    and here's a you tube video from nick gray where he shows how it's done.
    (flap at 2 minutes in.)

    https://www.youtube.com/watch?v=EWiA_d5Oshs
    Last edited by davethefish1; 04-12-2019 at 07:18 PM.
    You don't have to be a pipefitter to keep koi...
    but it helps...

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  11. #6
    Senior Member Rank = Yonsai davethefish1's Avatar
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    Quote Originally Posted by smartin View Post
    Hi Dave,

    been using that celotex myself seems to be a good insulation....
    yeah it's good stuff mate, i bought a load years ago to insulate my garage conversion in 2008

    Fish Flap and roof insulation-insulation-jpg


    and then more recently to insulate the cabin.
    i insulated the void under the floorboards but never got round to doing the internal roof.
    but i've used most of it insulating my pond and filters...

    now the missus wants to know when the rest of the cabin is being done...

    Fish Flap and roof insulation-20160624_163730-jpg


    when i re dig my new pond i'll be using it to completely line the pond to save on heating bills...
    Attached Images Attached Images
    Last edited by davethefish1; 04-12-2019 at 07:37 PM.
    You don't have to be a pipefitter to keep koi...
    but it helps...

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  13. #7
    Thanks for the info Dave. Iíll get some ordered Fish Flap and roof insulation


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  15. #8
    Extreme Koi Member Rank = Nanasai davec's Avatar
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    I have a flap on my cover 2 by 2 untreated timber frame for hatch with 2 gate hinges the frame that all cover is screwed down to 2 by 2


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  17. #9
    Looks good davic, Fish Flap and roof insulation


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  19. #10
    Senior Member Rank = Nanasai smartin's Avatar
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    Cheers Dave x2 seems simple enough, I will give it a go tomorrow weather permitting.... thanks Steve..

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  21. #11
    Extreme Koi Member Rank = Nanasai davec's Avatar
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    Sadly I canít take the credit for doing it my dad did it but heís done a great job so easy just to lift the flap drop food in


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  23. #12
    Dave..or anyone else
    Gotta get around to sorting covers out ASAP. Not sure of the simplest way.
    Pond is about 4m x 4m with one corner chamfered.
    Quite liking ďDevon koi pondĒ method of sliding polycarbonate into grooves in timber.
    Would certainly be easier to store behind the pond.
    Was thinking maybe 4x2 or 6x2 timbers to avoid sagging with 1m wide sheets of 16mm polycarbonate.
    Any other genius ideas?


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  25. #13
    Senior Member Rank = Yonsai davethefish1's Avatar
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    4mtrs is quite a span without sagging.
    I'd be tempted to make one side slightly higher or with an apex to help with run off.

    Not sure even 6x2 wouldn't sag a little over a 4mtr span...
    But with one side higher would still run off...

    Also 16mm is quite flexible so would need good all round support. And at 1mtr wide might sag across the width?
    Someone who has 16mm poly might have a better idea as I got the 35mm.
    You don't have to be a pipefitter to keep koi...
    but it helps...

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  27. #14
    Thanks mate.
    The actual ďclear spanĒ is closer to 3.6. My pergola timbers are 6x2 and seem ok but arenít carrying any weight.
    Good thinking about the thickness...Iíll consider going up to 25mm then.
    I planned on having a slight fall so water can run off and keep a small air gap also.


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  29. #15
    Senior Member Rank = Nanasai smartin's Avatar
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    Hi BCC
    35mm even though slightly heavier is actually more stable and less prone to sagging than anything thinner, this might help with your spanning issue, i would of thought 6x2 would be strong enough if used upright (mounted on the 2") Steve

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  31. #16
    Iíll get price for 35mm then.
    One of the roofing places has a sale on at the moment, 25% off iirc so Iíll get in quick.
    Not cheap is it?


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  33. #17
    Senior Member Rank = Yonsai davethefish1's Avatar
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    Don't know what prices you've had for polycarbonate.
    But here's the place I got mine from
    They do stock sheets and made to order.

    https://www.varicoltd.com

    4mtr x 1050mm 35mm clear is £102 inc vat
    Edit £18 for delivery

    https://www.varicoltd.com/35mm-multi...eet-clear.html
    Last edited by davethefish1; 06-12-2019 at 10:19 PM.
    You don't have to be a pipefitter to keep koi...
    but it helps...

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  35. #18
    I got a 7 wall 25mm large sheet big enough to mean I just needed 1 sheet. My pond is not large. I did have issues moving it to the garden had to go over the garage roof.

    Itís pretty robust I have no sagging

    https://www.roofingmegastore.co.uk/p...erm.html<br />


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  37. #19
    Senior Member Rank = Nanasai smartin's Avatar
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    Quote Originally Posted by bigcarpchaser View Post
    I’ll get price for 35mm then.
    One of the roofing places has a sale on at the moment, 25% off iirc so I’ll get in quick.
    Not cheap is it?


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    Hi BCC I used roofing megastore I got 3 lengths of 35mm x 1050mm x 2000mm plus fixing caps for around £240 all in delivered, looks like Dave the fish has found a good price, cheers Steve

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  39. #20
    Thatís the place, 25% off, still working out to be £400 quid odd plus the timber, tape etc.
    Might investigate the pool covering stuff like Fred has given the cost and hassle of storing PC.
    Pretty sure is about £125 for the size I need plus a lady with a big sewing machine to hem it up and put some eyelets in.
    Hmmmm this hobby donít half cost some bloody money eh?


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