hole in gunite, builder isn’t filling with gunite?

Katy Tx Mom

Silver Supporter
Oct 7, 2021
14
Katy, Texas
After the gunite was cured the plumber came and noticed the jets were positioned too low. They removed a large amount of gunite and fixed the jets. I attached a pic of some of the conversation with the builder. Plus today he told my husband that the material that will fill the hole is stronger than gunite. But isn’t the shell supposed to be gunite?
Thank you ahead of time!
 

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jamjam

Well-known member
Jun 25, 2020
668
NY
Pool Size
25000
Surface
Vinyl
Chlorine
Salt Water Generator
the patch material will be formulated to bond to the already cured gunite - the plaster is what makes your pool waterproof. Gunite is just a formulation of cement and aggregate applied through a hose via a specific process. All that matters is the patch is structurally sound and bonds properly to the existing shell.
 

Bperry

Gold Supporter
Aug 20, 2020
1,071
Knoxville, TN
Pool Size
27000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-60
After the gunite was cured the plumber came and noticed the jets were positioned too low. They removed a large amount of gunite and fixed the jets. I attached a pic of some of the conversation with the builder. Plus today he told my husband that the material that will fill the hole is stronger than gunite. But isn’t the shell supposed to be gunite?
Thank you ahead of time!
Your text message picture just references “thin set” and so since the hole is way below the tile, he assumed you were just asking about tile.

They will patch the hole with some kind of cement, maybe not gunite. The plaster will go over the gunite and patch to provide waterproofing.
 

jamjam

Well-known member
Jun 25, 2020
668
NY
Pool Size
25000
Surface
Vinyl
Chlorine
Salt Water Generator
i think it has more to do with the patch mix being designed to make better adhesion to the rest of the cured shell
 

tomfrh

Well-known member
Jan 30, 2018
541
Australia
Some clarification - gunite is simply concrete. Concrete is a mixture of sand, cement and aggregate (and possible admixtures).

I disagree with the posters above who claim the gunite (concrete) shell provides no waterproofing function. The concrete shell absolutely helps retain water.

It is difficult to do infill patches in concrete (aka construction joints) that are as leak proof as virgin unbroken concrete. It is common in the construction industry to add secondary measures such as waterstops at such joints, to help provide an additional barrier where old concrete meets new.

If this was my pool I would be ensuring they get this right as you could be encouraging future leaks. I’d want an epoxy bond between old and new.
 

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Bperry

Gold Supporter
Aug 20, 2020
1,071
Knoxville, TN
Pool Size
27000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-60
Some clarification - gunite is simply concrete. Concrete is a mixture of sand, cement and aggregate (and possible admixtures).

I disagree with the posters above who claim the gunite (concrete) shell provides no waterproofing function. The concrete shell absolutely helps retain water.

It is difficult to do infill patches in concrete (aka construction joints) that are as leak proof as virgin unbroken concrete. It is common in the construction industry to add secondary measures such as waterstops at such joints, to help provide an additional barrier where old concrete meets new.

If this was my pool I would be ensuring they get this right as you could be encouraging future leaks. I’d want an epoxy bond between old and new.
I don’t think anyone was implying that concrete provides NO water proofing (the Hoover dam is made of concrete) just that the plaster is what does the final water proofing. Concrete itself tends to be porus and allow moisture to seep through slowly. That’s why basement foundation walls get water proofing membranes and coating to prevent water intrusion in areas with high water tables.
 

Katy Tx Mom

Silver Supporter
Oct 7, 2021
14
Katy, Texas
Your text message picture just references “thin set” and so since the hole is way below the tile, he assumed you were just asking about tile.

They will patch the hole with some kind of cement, maybe not gunite. The plaster will go over the gunite and patch to provide waterproofing.
Thank you
Some clarification - gunite is simply concrete. Concrete is a mixture of sand, cement and aggregate (and possible admixtures).

I disagree with the posters above who claim the gunite (concrete) shell provides no waterproofing function. The concrete shell absolutely helps retain water.

It is difficult to do infill patches in concrete (aka construction joints) that are as leak proof as virgin unbroken concrete. It is common in the construction industry to add secondary measures such as waterstops at such joints, to help provide an additional barrier where old concrete meets new.

If this was my pool I would be ensuring they get this right as you could be encouraging future leaks. I’d want an epoxy bond between old and new.
Thank you so much for the good info!! Should I ask for an additional warranty of some sort? It’s so hard to trust after having past issues with home contractors.
 
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