New deck heaving

RazorBill

Active member
May 28, 2013
32
Hi,

My 4 month old decking is already heaving in a large area and is heaving around the coping. It is pulling the mastic away and seems to be getting worse. It is upwards of 1 in now (see pic). Pool guy says this isnt "normal" but should resolve it self by Summer. I am not so sure.

Does anyone have experience with this type of issue? Did it settle back down?

(i live in the Dallas area)
 

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danacc

LifeTime Supporter
Jun 29, 2013
269
There was an ice storm that came through in early December. Temperatures stayed below freezing for over 48 hours, and there was ice on the ground for days. It is unusual for it to stay freezing here for as long as it did.

Weather here is highly variable. This winter, we've had some lows around 19, and some highs in the 60s. Today the high was 66. Tonight it will drop to freezing, and the high tomorrow should be in the mid 30s with a low of 19.
 

Flippy

Well-known member
Jan 8, 2011
606
Richmond, Texas
JohnT said:
I'm betting they used dirt to backfill and it is settling.

Regardless, it's not going to correct itself.
^^^^^ This is what I am thinking. It takes days and days for the ground to freeze. This will not auto correct itself.
 

RazorBill

Active member
May 28, 2013
32
They used sand to fill.

Another thing is that it started prior to any low temps. Sounds like I need to get them back out here ASAP.
 

duraleigh

Admin
Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
32,863
Sebring, Florida
Sand would not have been a first choice for back fill in my area but I don't know about Dallas.

Regardless, others are right, it will not fix itself.
 

ouachita

LifeTime Supporter
Oct 9, 2009
324
Doesn't the Dallas area have some expansive clay soils? It is either settling because of improperly compacted fill or heaving due to expansive clay. It will not correct itself although if it is expansive clay it will move up and down with seasonal changes due to ground moisture. If it has moved 1" in four months that is pretty excessive.
 

woodyp

Mod Squad
TFP Expert
LifeTime Supporter
Apr 17, 2010
10,620
East Texas
Been an awful lot of rain in Big D area over last 4 months though after a super dry summer. Almost got us back to average yearly rainfall levels! Still -7 on the year in East Texas.
 

pragmatic

LifeTime Supporter
Jul 7, 2011
521
Friendswood, TX
woodyp said:
Been an awful lot of rain in Big D area over last 4 months though after a super dry summer. Almost got us back to average yearly rainfall levels! Still -7 on the year in East Texas.
Hydraulic expansion is my guess as well. I'm in SE Texas with a pool built in/after drought conditions-2012. My pool deck did the same thing after about 6 months at the union to the existing patio (even with re-bar tie-in). My PB came back and redid a 16-inch swath around the entire patio. Not an easy task, but we didn't feel the deck would correct itself. It's holding firm after 6 months.
 

RazorBill

Active member
May 28, 2013
32
Thanks everyone. The PB and deck guys are coming back out. I also can now see a very long (but small) crack in the aggregate. There is obviously a problem.

We have had some abnormally cold temps here. My poor pool equip is working OT.
 

diyindux

Well-known member
Jul 6, 2013
187
Saturated sands don't heave, they only settle if they haven't been properly compacted. However, expansive clays which Texas has plenty of do heave when saturated. Did you see them place the backfill? Could they have cheated and re-used some on-site material?
 

RazorBill

Active member
May 28, 2013
32
All dirt was already removed. i only saw sand and then rebar. Not sure what they did prior to that. Deck guy came out. Claims the heave is normal. Agrees that the mastic needs to be fixed or it will just get worse as water/moisture continues to go down under the concrete. Claims the crack is only superficial and is normal. I told him it was unsightly and that the work was not proper and i should not have to look at it. He didnt agree or disagree.

He is meeting the PB owner at my place next week to review. I told them both that i know heave happens but this is to much too soon. I dont think i am being unreasonable here. I have another slab poured right by the heaving deck and it has not heaved in over 2 years so i am not sure we can blame the clay.
 

RazorBill

Active member
May 28, 2013
32
More heave with wet and cold weather. PB, concrete contractor, sales guy, all say nothing to be done and is to be expected. Frustrating but my only hope is that it settles over the summer.