DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (
-   Concrete, Stone & Masonry (
-   -   basement floor cracks, problem? (

kree 01-20-2013 09:11 AM

basement floor cracks, problem?
2 Attachment(s)
In the Chicago suburbs in a 6 year old home. I see basement floor concrete cracks extending from every support column.

1) Are these cracks an issue to be worried about?
---no moisture, even under saran wrap taped to floor.

2) If I finish and carpet over, do these cracks need to be filled, and with what?
---Caulk, dryloc floor paint, something else?

3)I had thought about painting the floor solely for concrete dust and/or filling the cracks
(see #2) HOWEVER if I use a subfloor system (Delta, dricore, tyroc) can I leave the floor AS IS? No painting, no filling of cracks?


joecaption 01-20-2013 09:24 AM

Hard to tell from that close up.
It's normal for some settling cracks to form. That one in the picture is I'd figure on seeing a crack.

kree 01-20-2013 09:33 AM

Would another picture help? Was it blurry, not close's easy enough to go take another picture just let me know what is helpful.

I have about 6 columns in the basement, all with 4 cracks extending out from each other to each other.


joecaption 01-20-2013 09:48 AM

That would be normal and not need filling.

Canarywood1 01-20-2013 10:28 AM

Do you know when those column's were put in??

kree 01-21-2013 09:14 AM

The home was new construction, 6 years old now.
The concrete guy was awful and made some other goofs on the foundation.

stadry 01-21-2013 09:46 AM

they're called re-entry cracks & typically found when no isolation jnt surrounds the column foundation,,, expect your supporting foundation(s) is at the same elevation as the top of footing,,,the floor ( floating slab ) was then install'd,,, in fairness to the conc sub, that may've been as order'd by the bldr,,, if you find finishing issues w/floor's surface, THEN blame the conc sub :yes: many conc subs don't excavate footers but just form, set rebar, place, & finish the conc :yes:

don't see any indication of movement which'd manifest itself by spalls on the crk edges therefore no movement has occurred,,, you'd expect no movement in a bsmt due to temp differentials as the humidity/temp are fairly constant.

IF it were ours ( & we have 'em, too ), smear some acrylic caulk over 'em to keep out rising dampness then finish your floor :thumbsup:

IF a proper jnt pattern had been included along w/isolation jnts, there probably wouldn't have been any random cracking however we typically only see that addl expense w/commercial & industrial work

Canarywood1 01-21-2013 11:51 AM

"many conc subs don't excavate footers but just form, set rebar, place, & finish the conc "

And that's why those cracks are there,footings should have been excavated,really sloppy way of doing the job.

jomama45 01-21-2013 04:43 PM

As straight as those "cracks" are, I'd bet that they actually used "Zip Strips", which are fairly common and completely acceptable from a non-asthetic standpoint. The likely reason you're not getting any moisture on Saran wrap is because it has plastic sheeting/Visqueen under the floor for a vapor barrier, which is required by code in most, if not all, of the Midwest under baesment floors. I see nothing alarming about anything in the pictures, and don't know of anything you could do to improve the non-issues before moving forward with flooring........:thumbsup:

stadry 01-21-2013 04:44 PM

good point, jo, & a definite possibility,,, impo, crks are due to reason previously post'd,,, how to proceed was original post & an answer's also post'd above,,, its conjecture to say excavation/footings were sloppy/properly built, postfoundations don't exist, or place blame w/o supporting data,,, it is what it is as ' those guys got paid & they're gone ! ' rule now applies,,, also post'd my solution were that floor mine

40yrs i've been doing this work & still can't look thru floors OR walls :no:
just have to depend on my experiences,,, when all's said & done, more is said than done,,, btw, i like jo's theory better'n mine but still conjecture w/o excavation

concretemasonry 01-21-2013 06:04 PM

If the columns/post were on footings a good contractor would make tooled joints toward the columns leading to a classic diamond pattern to eliminate random ugly cracks.

If there is no difference the floor height on the adjacent sides of a crack, it is probably a cosmetic problem since a basement slab does not move much.


All times are GMT -5. The time now is 09:16 PM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Search Engine Friendly URLs by vBSEO 3.6.1