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Roofing With a Pond Liner

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Roofing a Flat Roof with a Pond Liner

The old garage that we converted to a food production place came with a real challenge. The big building has a roof with a very low 1-12 slope. This type of roof tends to leak when covered with roof metal sheets, especially if the sheets overlap in the middle like ours did.

I tried different methods to fix the problem, but nothing really worked. The caulking did not last, even urethane roof cement did not stand up to the elements. 

To cover the roof of a 30 feet long building with metal, the roofing sheets would need to be at least 30+ feet long for it to not leak. This would be expensive, and there would be no way I could do it myself. So I did research to find alternatives.

There didn’t seem to be many alternatives available, till I got the idea to use a pond liner. It does not seem that there is much of a difference between a roof liner and a pond liner anyways, except the availability and the price tag. I even was able to get the pond liner on kijiji for a very good deal.

How to lift a pond liner

The pond liner I got came in a 10 foot roll weighing about 360+ pounds. It was a challenge to get the roll on my truck with two men, let alone onto the roof. So what do you do?

Pond Liner for a Flat Roof

I screwed some boards to the truck and also to the edge of the roof and used an old lifting trick. This way my son and I were able to lift the heavy pond liner roll onto the roof. If you can’t see the video below, go here.

The underlayer for the pond liner

Pond Liner for a Flat Roof

To protect the pond liner from rubbing on some surface irregularities we used a foam underlayer for floated laminate floor.  It was easy to roll out and we secured it with small boards.

How to roll out the pond liner

Pond Liner for a Flat Roof

The pond liner was triple folded. I started on one side making sure there is plenty to go all the way over the parapet. Then I unfolded the liner to cover the whole roof. When covering a flat roof you want to make sure there is no overlap where moisture can wick under.

Securing the pond liner

Pond Liner for a Flat Roof

The garage roof has a parapet on three sides, so I lined the whole parapet and secured the liner end with the cap. It looks good and assures that no moisture can come in anywhere.

Pond Liner for a Flat Roof

To prevent the liner from getting lifted by the wind, I simply placed old tires on top of the roof. A simple and free solution suggested by a neighbor.

The pond liner has been an inexpensive and effective DIY solution that I would surely recommend for flat buildings. Pond liners work great if you can cover the roof in one piece.

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Roofing With a Pond Liner

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Filed Under: Garage - Greenhouse Tagged With: Food Production Garage

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Comments

  1. Sheri Cline - WA. State Zone 8b says

    at

    Now, the next step is to get rid of those tires and replace with some low grow pots! That’s a whole lot of growing space and I can see pumpkins, zucchini & cucumbers spreading out in the available sun!

    Reply
    • Anna says

      at

      The tires could be planters too. The challenge would be to water those planters. Since the roof is not totally flat, the water would run off. It has crossed our mind though.

      Reply
  2. deepa says

    at

    Thank for sharing this valuable information!

    Reply

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