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Thread: Loose, separated, and cracking flagstone on my hot tub - how best to repair

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    Loose, separated, and cracking flagstone on my hot tub - how best to repair

    Hello - first time poster here,

    I have a hot tub that has two waterfalls into my pool. The white flagstone (don't know how better to describe it) is cracking in places, loose in places, and has come off in places.

    I have read this thread: http://www.troublefreepool.com/threa...agstone-Coping
    I have three questions:
    1. in the post 05-09-2011, 01:00 PM in the thread I referenced above, it mentions "TypeS mortar with a bonding agent." I bought some Type S mortar. Do I need to buy bonding agent as well (if so, where to buy and what's it called) or is the bonding agent just a part of the Type S mortar, so there's nothing else to buy?
    2. As I mentioned, I also have some stones on the top of the hot tub that seem secure but have some cracks. Is there some sort of sealant that I should put in the cracks (they are narrow, so this task would be difficult), or is there some sealing finish (same idea as using polyurethane to seal a wood floor but I certainly don't want something that slick on the hot tub) that I could coat the entire top of the hot tub with?
    3. Any other tips or direction?

    I am planning to remove any stones that I can wiggle loose with my hands, clean off the grout, wet the surfaces and re-seat the stones, let it dry, fill in grout, then maybe seal the grout and or stone based upon recommendations here. Please see pictures below.

    ht1.jpg
    ht2.jpg
    ht3.jpg


    thanks!
    FortWorthAreaPool (how about "FW" for short?)
    20k in ground gunite pool with spa that waterfalls into pool. Chlorine, 60 sq. ft. DE filter, Minimax natural gas heater. Pool built in late 90s.

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    Casey's Avatar
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    Re: Loose, separated, and cracking flagstone on my hot tub - how best to repair

    Welcome to TFP FW!

    Although I can't help you with this issue you're having, I just wanted to welcome you. You have a very nice looking pool and I hope you can get those stones fixed right up. You've come to the best pool forum on the web! Hope you enjoy your stay here with us!
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Re: Loose, separated, and cracking flagstone on my hot tub - how best to repair

    Hey Fort Worth,

    So I don't KNOW that this is the case but a quick google search turned up that bonding agent is an additive for concrete because I kept encountering people asking how much to add.

    A search of home depot.com for "bonding agent" yielded an entire concrete bonding agent section. Here's an example, http://www.homedepot.com/p/Quikrete-...0201/100318465

    I know that they ARE stone and grout sealants but I don't have enough experience to be able to tell you which one is good or suitable for your project. Sorry I couldn't be of more help. Maybe someone will be along shortly to answer the rest.
    18 x 36 Vinyl Inground, Coverstar Cover, 2 speed Pentair Pump, Hayward 425 Sq Ft Cartridge Filter, Hayward Heat Pump, Prologic PS8, T-15 Salt Cell, 2 Colorlogic LED lights, TF-100 Test Kit

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    Re: Loose, separated, and cracking flagstone on my hot tub - how best to repair

    Thanks, Blueskies,
    I looked at the bonding agent link and found two potential applications. If you have an opinion over which to use, please advise. Or whoever replies next, please feel free to advise. I could see either painting it on and letting it dry before seating or mixing it in with the mortar as what seem to be logical options.

    "APPLICATIONS
    Use As a Paint-On Adhesive

    Apply to surface with brush, roller or spray to the thickness of a coat
    of paint. Can be applied to a dry or damp surface
    Place new concrete, topping mixes, Portland cement, plaster mixes
    or patches as soon as the adhesive
    is dry. Gypsum plasters and fin-
    ish plaster should be placed over tacky coat of adhesive
    Make sure basecoat plaster is dry before applying adhesive
    Tools, brushes and other application accessories should be
    immediately cleaned with water. Use hot water to clean up any
    drippings
    Use As a Slurry Coat
    Make slurry from approximately 2 parts cement and 1 part Concrete
    Bonding Adhesive
    Apply a thin layer of slurry onto the properly prepared substrate
    using a trowel, brush or squeegee, being sure to rub the slurry
    thoroughly into the surface
    Apply topping or repair material immediately before the slurry dries"

    thanks!
    20k in ground gunite pool with spa that waterfalls into pool. Chlorine, 60 sq. ft. DE filter, Minimax natural gas heater. Pool built in late 90s.

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    Re: Loose, separated, and cracking flagstone on my hot tub - how best to repair

    Good morning FW,
    Found this video on YouTube, this might help you. http://youtu.be/SrEMt9I3mZE

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    Re: Loose, separated, and cracking flagstone on my hot tub - how best to repair

    Thanks, Sidewinder
    20k in ground gunite pool with spa that waterfalls into pool. Chlorine, 60 sq. ft. DE filter, Minimax natural gas heater. Pool built in late 90s.

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    Re: Loose, separated, and cracking flagstone on my hot tub - how best to repair

    I would like to back up a few months. What was that cause of that damage.....that's pretty severe.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Loose, separated, and cracking flagstone on my hot tub - how best to repair

    Well, nothing fell on the hot tub, and no one took a hammer to it if that's what you're asking.
    I assume that over 15+ years the rain and sun and cold and heat separated the joints between the rock and mortar. Then more rain made it worse until some rocks became loose. Then when I noticed that they were loose, I wiggled them free by hand rather than leaving them loose where someone might step or lean on them only to have them give way.

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    Re: Loose, separated, and cracking flagstone on my hot tub - how best to repair

    Interesting, they look a little more recent than that but I think that you "loosened them up" probably accounts for that.

    Those masonry joints come loose usually for one of two reasons......

    1. Improper bonding at time of installation

    2. Moisture penetrates down into the joint and then the freeze-that cycle pops them loose.

    The fix may not be as easy as it appears. I would consider getting a professional estimate first and the going from there.

    My success with masonry repairs has been OK but incredibly time consuming to get it looking really good.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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