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Thread: Is my gunite disintegrating?

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    Is my gunite disintegrating?

    I had loose tiles on the spillway between the spa and pool. Maybe due to the heavy freezing we had this winter(?) I began pulling them off thinking I would mortar on the loose ones. However, this became a much bigger project than anticipated. The gunite under the tiles was disintegrating and the tiles were coming off with large amounts of 'pool' attached. What do I do now??
    Thanks so much for any input!
    photo 1.JPG
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    Cl 4PPM
    Ph 7.5
    CH 300
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    1980's built, 26K, Plaster, TF 100 Test Kit, Pentair 48 ft2 DE, Pentair 1 HP Pump, Tri-chlor (switching to Liquid!), Tigershark robot cleaner

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    mas985's Avatar
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    Re: Is my gunite disintegrating?

    Tile is set in mortar. The mortar is on top of the gunite. So you should only need to reset the tile in mortar but clean out the old mortar first.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Is my gunite disintegrating?

    Thanks! How deep is the mortar? in some areas I have gone down 3/4 of an inch and it is still the gray matter as in the picture. I am using a hammer and screwdriver and it is coming up in layers. Will I get to a place where it is level - or will i need to level it our with mortar? I appreciate your advice!

    1980's built, 26K, Plaster, TF 100 Test Kit, Pentair 48 ft2 DE, Pentair 1 HP Pump, Tri-chlor (switching to Liquid!), Tigershark robot cleaner

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    mas985's Avatar
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    Re: Is my gunite disintegrating?

    It can be pretty thick because they use the mortar to level out the top of the tile and gunite is really hard to get level. So you will need to level it out again with mortar. Also, you will know it when you reach the gunite. It should be much harder than the mortar.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Is my gunite disintegrating?

    Thanks Mark, I'll keep digging out the mortar! Any harm to the pool to have the water running over this while I await new tile?

    1980's built, 26K, Plaster, TF 100 Test Kit, Pentair 48 ft2 DE, Pentair 1 HP Pump, Tri-chlor (switching to Liquid!), Tigershark robot cleaner

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    markuszoom5's Avatar
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    Re: Is my gunite disintegrating?

    I am new to pools but not to tiling. No there is no harm in getting water on concrete or any concrete based surfaces. Thin set is just a finer form of concrete. You would not want water on mastic glue but that's not used for wet areas anyways. Take your time and do it right, don't apply new thin set to wet let things dry. And also when you mix the thin set let it sit for 5 min before using so it sets a bit. Also clean the old tile backs as best as you can.
    Circa 20,000 gal IGP, 12 years old, Hayward SP2607X10, 1 hp single speed pump, Hayward S244T Sand filter, vinyl liner, using Aquacheck test strips and Taylor K-2006 Test Kit, 1 skimmer, 1 bottom drain, 2 jets (near stairs and on the opposite deep end)

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    Re: Is my gunite disintegrating?

    If you have not set tile before and REALLY want a nice looking job, you may want to get a price from a pro.

    It's not rocket science but it can be a mess if not done properly..

    If you are DIY, imbed the (now cleaned) tile in the thinset immediately. Failure to do so can result (depending on the weather) the thinset "skimming over" and the tile will not stick. It may appear that it has done so but you will begin replacing tiles again next spring if you do not imbed them in wet thinset.
    Dave S.
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    markuszoom5's Avatar
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    Re: Is my gunite disintegrating?

    I guess I should have been more clear. As duraleigh said, as soon as you put down thin set, bed the tile. What I mean is when you mix thin set in bucket first, they usually want you to let it sit a few min before applying.
    Circa 20,000 gal IGP, 12 years old, Hayward SP2607X10, 1 hp single speed pump, Hayward S244T Sand filter, vinyl liner, using Aquacheck test strips and Taylor K-2006 Test Kit, 1 skimmer, 1 bottom drain, 2 jets (near stairs and on the opposite deep end)

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    Re: Is my gunite disintegrating?

    I really appreciate the advice. I am going to do this in the fall when I am lowering the water and can get the area dry and work from the hot tub side. I've done tiling before - bathroom floors and counters - so this will be a DIY job for me! I'll post pictures when I'm done!

    1980's built, 26K, Plaster, TF 100 Test Kit, Pentair 48 ft2 DE, Pentair 1 HP Pump, Tri-chlor (switching to Liquid!), Tigershark robot cleaner

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