What I Found Between Liner and Underlayment

[Gordo33]

I pulled the liner today from the pond and stream. I was surprised to see the amount of roots, depressions in the liner and roofing felt disintegrating . My plan was to use the roofing felt (#15) again as an underlayment but now I am concerned this is not enough of a barrier. The pond was going into its 5th season before I decided to expand it. Should I use a different material for the underlayment?
Top picture is the underside of the 45 mil liner. The second picture is the #15 roof felt on top of the ground.

 

[sissy]

I used 2 layers of 15 lb and some 30 lb roofing felt to help with moles and then used the underlayment also on top of it .It was all leftover stuff from the house .

 

[Gordo33]

I used 2 layers of 15 lb and some 30 lb roofing felt to help with moles and then used the underlayment also on top of it .It was all leftover stuff from the house .

I was thinking of using a double layer .of the roofing felt. I may have access to used carpet padding .
I want to use the old liner to line the bog. Do you think the grooves created by the roots be an issue?

 

[Meyer Jordan]

Stick with what has been proven to work, standard non-woven geotextile underlayment. It will last longer than the EPDM liner.
Old liner in 'bog' should be fine.

 

[sissy]

I had underlayment under my other pond it fell apart and it was a good underlayment sent to me by a special friend that builds ponds It did not last in spots and that pond was rebuilt in 2014 I was shocked at the condition of it ,which had thin spots and had slight rips in it ..I left it and put the new on top of it .I did leave in the roofing felt which was fine and got new underlayment .

 

[Meyer Jordan]

I had underlayment under my other pond it fell apart and it was a good underlayment sent to me by a special friend that builds ponds It did not last in spots and that pond was rebuilt in 2014 I was shocked at the condition of it ,which had thin spots and had slight rips in it ..I left it and put the new on top of it .I did leave in the roofing felt which was fine and got new underlayment .

Yes, some materials sold as underlayment will not hold up. Only the 6 oz. non-woven geotextile .does the job. This is sold by EasyPro and other well-known manufacturers.

 

[sissy]

This was given to me buy a well known pond builder so guessing it was good stuff since it was really thick and heavy .I put more on top of it after the rebuild again this year

 

[Ruben Miranda]

Hello
Not surprised to see roots under the pond, because plant roots will go for the moisture and easy access.
I am surprised of the condition of under layment, I thought it would last longer.
Is the liner also cracked and leaking.

Ruben

 

[Gordo33]

Is the liner also cracked and leaking.

Ruben

No cracks or leaks . The liner was pulled because I am expanding the pond.

 

[sissy]

OHH the always go bigger or deeper .I found the tag for my underliner and shipping weight was 55 lbs and it was really heavy stuff .

 

[addy1]

When I pulled my Arizona pond the carpet pad was still as if new.

 

[Meyer Jordan]

When I pulled my Arizona pond the carpet pad was still as if new.

Dry climate.

 

[addy1]

Dry climate.

Most of time for sure! We do get flooded during the rainy season, does that count? lol