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Need Help Asap. Hardwood Over Concrete

 
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Old 02-11-2019, 03:16 PM   #1
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Need Help Asap. Hardwood Over Concrete


we are installing hardwood over concrete subfloor. The hardwood is separating when we are gluing it down even though we are taping it. What do we need to do so it doesn't separate while we are installing the hardwood?
It's 3/4 inch Hardwood by 3 &1/2
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Old 02-11-2019, 03:32 PM   #2
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Re: Need Help Asap. Hardwood Over Concrete


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we are installing hardwood over concrete subfloor. The hardwood is separating when we are gluing it down even though we are taping it. What do we need to do so it doesn't separate while we are installing the hardwood?
It's 3/4 inch Hardwood by 3 &1/2
Not the kind of thing you should be trying to do if you don't know what you are doing.

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Old 02-11-2019, 05:13 PM   #3
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Re: Need Help Asap. Hardwood Over Concrete


Thanks Ed, now do you have a solution or are you just sticking your nose into something it doesn't belong?
I'm a general contractor that has run into a problem. No I am not a master of every trade that my employees do. But I also don't go around posting stuff to pretend I'm smart.
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Old 02-11-2019, 05:31 PM   #4
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Re: Need Help Asap. Hardwood Over Concrete


Did that once. We installed in stages, bracing it against the far wall with some perpendicular boards.
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Old 02-11-2019, 05:36 PM   #5
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Re: Need Help Asap. Hardwood Over Concrete


Thanks Mark, yeah that's something I was sort of pondering. If I remember correctly that room is like a 18 ft long though.
Do you remember why it was not just staying in place? Where the tongue and groove just not tight enough?
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Old 02-11-2019, 05:38 PM   #6
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Re: Need Help Asap. Hardwood Over Concrete


I'm going to the job site to see for myself, just wanted to have some insight and hopefully get a game plan together before I get there.
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Old 02-11-2019, 05:38 PM   #7
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Re: Need Help Asap. Hardwood Over Concrete


18' wide
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Old 02-11-2019, 05:42 PM   #8
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Re: Need Help Asap. Hardwood Over Concrete


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Thanks Mark, yeah that's something I was sort of pondering. If I remember correctly that room is like a 18 ft long though.
Do you remember why it was not just staying in place? Where the tongue and groove just not tight enough?
Not the straightest boards, as I recall. So snugging one end pushed out the other.
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Old 02-11-2019, 06:16 PM   #9
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Re: Need Help Asap. Hardwood Over Concrete


Hardwood?

Helps if you're more specific, prefinished/engineered or unfinished raw wood?
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Old 02-11-2019, 08:08 PM   #10
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Re: Need Help Asap. Hardwood Over Concrete


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Originally Posted by Shaggyman89 View Post
Thanks Ed, now do you have a solution or are you just sticking your nose into something it doesn't belong?
I'm a general contractor that has run into a problem. No I am not a master of every trade that my employees do. But I also don't go around posting stuff to pretend I'm smart.
Lighten up, man. He's actually giving you good advice.

Hardwood flooring is somewhat of a specialty, not something normally all that well done by "generalists". We don't know you. Nice introduction.
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Old 02-11-2019, 08:17 PM   #11
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Re: Need Help Asap. Hardwood Over Concrete


Did you seal the concrete at all before placing the flooring?
What kind of glue?
Maybe too much glue was applied and it's swelling the material a bit?

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Old 02-11-2019, 08:29 PM   #12
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Re: Need Help Asap. Hardwood Over Concrete


Lets get a few more details before I give you any input. I've laid quite a bit of hardwood over concrete.



What glue are you using? Is it wet lay, or let skin then lay? Are you laying it tongue towards glue, or grove towards glue? Are you laying above grade, or basement?
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Old 02-11-2019, 09:27 PM   #13
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Re: Need Help Asap. Hardwood Over Concrete


First off sorry I got snappy.
If someone has advice im VERY appreciative, but to assume I dont have any experience and to just comment on that point alone without a solution is arrogant and ignorant which I have time for neither.

My lead installer is experienced but not as much in concrete installation.I wasnt there when he "started"( all boards were pulled back up) so wasnt able to assess the situation in person.
It is above grade, did not seal it.
We are using bostic duragrip.
We are doing a wet lay.
What does it mean to have the tongue or groove toward the glue? And which should I do in this situation?

We have done it before many times with no problems but he said it just would not. stay together and there were small separation gaps.
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Old 02-11-2019, 09:29 PM   #14
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Re: Need Help Asap. Hardwood Over Concrete


Nah man I didnt seal it. Possible he used too much but he used the size trowel listed on the bucket for our size hardwood.
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Old 02-11-2019, 10:05 PM   #15
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Re: Need Help Asap. Hardwood Over Concrete


Quote:
Originally Posted by Shaggyman89 View Post
First off sorry I got snappy.
If someone has advice im VERY appreciative, but to assume I dont have any experience and to just comment on that point alone without a solution is arrogant and ignorant which I have time for neither.

My lead installer is experienced but not as much in concrete installation.I wasnt there when he "started"( all boards were pulled back up) so wasnt able to assess the situation in person.
It is above grade, did not seal it.
We are using bostic duragrip.
We are doing a wet lay.
What does it mean to have the tongue or groove toward the glue? And which should I do in this situation?

We have done it before many times with no problems but he said it just would not. stay together and there were small separation gaps.

Wet lay is incredibly hard to get tight & stay tight. Prefinish, or site sand? Always lay wet lay backwards. Push the tongue into the groove instead of conventional, otherwise you'll be plowing glue into the groove & never get it tight.

Prefinish, tape is your only real way to keep joints closed & don't be wallering around on flooring that's already laid. Never lay more than 2' at a time without securly anchoring the laid flooring. I prefer to lay 2' & get it tight & let the glue set before going further, otherwise you'll waller it out of position. If you don't have a long reach hardwood floor jack, get one so you can push the flooring tight together. If the floor is site sand, get it tight & lay scraps perpendicular & screw them down to hold the floor tight so you can keep laying beyond 2' at a time. The screw holes can be filled when you put down your trowlable filler.




One more thing, if you don't have a commercial hot glue gun like a pam tite, get one. Use hot glue & floor glue on the starter plank. Lay it the day before you want to start laying so you have a good first course anchor. You can also use the hot glue on the last course of your 2' run to anchor the wet laid progress till the glue sets. Glue down floor is not a money maker by the sq ft, it's really hard to make good time.

Keep asking questions, I'll answer them if I can.

Last edited by pinwheel; 02-11-2019 at 10:08 PM.
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Old 02-11-2019, 10:13 PM   #16
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Re: Need Help Asap. Hardwood Over Concrete


Thanks! Great info!. So how long should I let it "skin" before I install the boards.
And yeah its prefinished, I'll get some stronger tape tomm. Normally use the blue I'll get some frog tape.
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Old 02-11-2019, 10:19 PM   #17
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Re: Need Help Asap. Hardwood Over Concrete


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Thanks! Great info!. So how long should I let it "skin" before I install the boards.
And yeah its prefinished, I'll get some stronger tape tomm. Normally use the blue I'll get some frog tape.
Blue tape is sufficient, don't be stingy with it & don't be wallering the flooring on wet glue. I haven't used the glue you're using, so what's the label say about laying into a skin coat? I know Bosticks best can be laid wet or skined. I prefered to lay into a skin because it didn't slip around as much.
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Old 02-11-2019, 10:23 PM   #18
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Re: Need Help Asap. Hardwood Over Concrete


I'll have to check it when I get there tomorrow. Again thank you for your advice.
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Old 02-11-2019, 10:24 PM   #19
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Re: Need Help Asap. Hardwood Over Concrete


Pin, you're awesome


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Old 02-11-2019, 10:50 PM   #20
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Re: Need Help Asap. Hardwood Over Concrete


Quote:
Originally Posted by Shaggyman89 View Post
Thanks Ed, now do you have a solution or are you just sticking your nose into something it doesn't belong?
I'm a general contractor that has run into a problem. No I am not a master of every trade that my employees do. But I also don't go around posting stuff to pretend I'm smart.
Its not to pretend I'm smart. I live by it. I sub out what I am not excellent at. I have plenty of work, I make money off my subs, and I care about my reputation. If you want to run your mouth about my feedback how about a picture of this "professional" install

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