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Questions tagged [slab]

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Post tension slab tendons intersections

I ordered pre-pour inspection for the house we are building and I've got this report. They say tendons should not overlap at intersections. I'm concerned that it's like that by design. Gonna ask about ...
Rainmaker's user avatar
  • 375
2 votes
1 answer
879 views

Is it safe to excavate soil next to concrete slab?

I'm looking to regrade the soil around my shed so water doesn't continue to damage the sill plate. The concrete slab is barely above grade, so I'm looking to remove soil to expose it another 2-3 ...
Old_Sound5035's user avatar
0 votes
0 answers
38 views

What could this conduit under my basement slab be?

I was moving a shower drain for a basement bathroom and exposed what looks like some kind of cable conduit under the slab. It looks like the kind that's slit all along the length of it and just snaps ...
Egor's user avatar
  • 519
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0 answers
58 views

Water seeping under bottom of vinyl siding

Just moved in this house a couple of months ago and just noticed our home extension has water seeping through from the bottom of the vinyl siding whenever it rains. My house sits on a cement slab. I ...
Krreym's user avatar
  • 1
0 votes
0 answers
26 views

Question on soil and grass above foundation

My wife and I just bought our dream 1960s renovation and we noticed that the yard and gravel patio area is pretty much covering up the entire foundation. Is this something we need to worry about long ...
melanieng's user avatar
2 votes
1 answer
809 views

Can I build a room addition on a former concrete patio slab?

This concrete slab has a size of 9x20 square feet. It's 1 foot deep. I would like to build an ADU or room on it. I have included a 3D model of the room in the attached image. Can I re-use the existing ...
Moises Guerra's user avatar
1 vote
1 answer
217 views

Cracks or fissures on island? Is this normal and acceptable work for quartzite island?

We’re wrapping up our first home renovation and I’m unsure if this is normal or not. I noticed some cracks (or fissures?) in our island (jadore quartzite), which stood out because they catch your ...
Miche's user avatar
  • 11
0 votes
1 answer
300 views

How to abandon under-slab ductwork?

Our sub-slab ductwork (sonotube and sheet metal, no transite) is in terrible condition, so were switching to mini splits. We need to figure out how to safely and effectively abandon the current system,...
user177942's user avatar
14 votes
8 answers
13k views

Are loose-stacked bricks a suitable base for concrete steps?

We have a contractor building a set of concrete steps outside of our house (will be leading to a new French door whenever we get the door). They are using a bunch of left over bricks as filler they ...
Th3sandm4n's user avatar
2 votes
2 answers
931 views

Anchoring aluminum pergola to 4" slab

I just purchased a 11'x23'x8' aluminum pergola from Wayfair that will arrive in a couple weeks. It weighs roughly 750lb. In some reviews, it says the concrete screws that come in the kit are kind of ...
Cristian's user avatar
0 votes
1 answer
47 views

Will I have condensation on a slab cooled with groundwater?

New Construction, SLAB COOLING I’m planning a 24’ x 24’ two story studio with guest quarters, kitchenette & bath. The first floor heat will be an insulated concrete slab with PEX, boiler ...
Robert's user avatar
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1 vote
0 answers
53 views

Is gravel required under a concrete slab that is beneath a fence (not supporting it)?

I have a vinyl fence around the back of my house. The posts are already supported by cement. I want to create concrete forms in between the posts to cover the dirt so I don't have to deal with weeds ...
Merlin -they-them-'s user avatar
3 votes
2 answers
2k views

How can I pour a 20' x 20 ' slab on a slope?

What is the best way to pour a slab that is 20 ft x 20 ft but has a slope. The grade is 18 inches higher on one side
Chris Espi's user avatar
1 vote
1 answer
599 views

Best self leveling compound to use for this situation with LVP (1/2" feather edge thickness) [closed]

Looking for advice on which type of self leveling compound to level most of the concrete floor tied to this question asked earlier. I want to make it close to 6/16" min relative height so its ...
ChucktheDuck's user avatar
0 votes
1 answer
298 views

Adding laminate to concrete slab, am I planning this right?

Looking to put in Laminate flooring and seeing if my plan is ok or if it needs some correction. Background This is a half basement on grade, with about 4 feet underground on one side and walk out ...
ChucktheDuck's user avatar
0 votes
1 answer
57 views

How can I feed 2" PE pipe through a slab--asking about bend radius? [closed]

I'm trying to set sleeves for a monolithic slab pour. One of the sleeves is intended for running 2" water line. I wanted to use HDPE SIDR pipe aka flexible poly pipe. I can't find bend ratios for ...
cjc's user avatar
  • 101
0 votes
0 answers
142 views

Underpinning concrete slab in garage

I am looking at buying a property with a raised section in the garage with a concrete floor. This is a garage entirely seperate from the house. The earth under the end of the slab has fallen away: ...
gilbertbw's user avatar
  • 101
0 votes
1 answer
264 views

What is the best way to cut drywall that is touching concrete slab and can I fill the gap with backer rod?

Updating our late 70s house we bought in 2020 and and after removing tiles, found out the 2018 installed drywall touches the slab. 3 questions: Is the easiest way to fix this use an oscillating tool ...
ChucktheDuck's user avatar
0 votes
1 answer
123 views

water under sill plate, rotting sheathing

I have a detached garage of unknown age - the house is from 1935, so probably around then or newer. The garage is built directly on the slab with no curb wall. On one side of the garage, the slab is ...
Bengerman's user avatar
  • 103
3 votes
1 answer
2k views

Do I need reinforcement mesh or bar in concrete slab?

I've done a bit of searching and found conflicting answers: do I need reinformenent in my concrete slab? I am planning on putting down a 12ft by 8ft concrete slab for a shed (just for garden storage, ...
Puffafish's user avatar
  • 391
1 vote
0 answers
58 views

Will the vent arrangement for my bathtub pass inspection?

4 fixture bathroom - Florida inspector says all fixtures need to be wet vented in bathroom. I want to ask if the bathtub to the right with its own vent will work. I believe the inspector is wanting ...
Beaty's user avatar
  • 11
0 votes
0 answers
21 views

How to repair cracks in concrete floor after a slab leak?

Had a cold water leak in pipe under slab. Water came through cracks in floor. What is best and inexpensive way to repair the cracks?
Bet Okonkwo's user avatar
1 vote
1 answer
178 views

Why does my home have a double slab in the basement? [closed]

We recently got about 12 inches of water in our basement during some heavy rain. I've decided to put in a sump to prevent this in the future. I rented a breaker to get through the concrete. After ...
George's user avatar
  • 11
1 vote
1 answer
742 views

Can I build a wooden staircase on a concrete slab and meet code?

I'm currently in the process of replacing the front stairs on my house and my original plan was to go with a precast stone/granite staircase. To support this I poured this 6'x8'x6" pad to have ...
Matt's user avatar
  • 11
0 votes
1 answer
101 views

I'm looking to install turf against concrete patio slab, but the weep screed is in the way

I have a conundrum. The concrete slab depth ends right around the stucco weep screed on one side of the patio. I want to install turf and obviously won't be able to make it flush. There may be less ...
Alan's user avatar
  • 3
0 votes
3 answers
165 views

Refilling gravel under slab on a downhill grade

Our front patio was poured over an existing slab, with a significant gravel layer between them. I am digging out our water line, which happens to run just outside the edge of the slab. The plywood ...
nickwesselman's user avatar
0 votes
3 answers
252 views

What is the structure of a cement front porch on a 1940's house

We've been unable to get porch & deck enamel paint to not peal, so we are thinking of demolishing it for a rebuild of some or another design. Last paint job was ~5 years ago. Scraped off all the ...
User292177's user avatar
0 votes
0 answers
39 views

Double P Trap Unvented Under Slab

My kitchen sink has 2 p-traps that are unvented. One p-trap is under the kitchen sink, and the second is under the slab. What should I do? I am concerned about toxic sewage gas, not a slow drain. It ...
Chloe's user avatar
  • 1
0 votes
0 answers
73 views

Cement porch removal

We are planning on removing a cement porch from our house, which has a room underneath it. My husband did this to my parents house, using a sledgehammer, but he was 35 years younger. He has some type ...
Mary's user avatar
  • 1
7 votes
4 answers
5k views

Pouring a concrete slab in batches

I'm wondering if it's okay to pour a 7 x 9 x 4" slab for a shed in batches, in that I'm not able to handle all of the concrete in one day. If so, is there any attack plan that would work the best?...
Dave's user avatar
  • 71
0 votes
1 answer
105 views

Preparing addition room for a concrete slab, then dicovered old stair well hidden, how can this be dealt with?

An old addition room to a unit has structural issues, it was more than a hundred years old, and the floor structure was rotten, turns out they used a large beam in a reverse brick shelf right on the ...
J. M. Becker's user avatar
1 vote
1 answer
96 views

Water coming from the slab under the tub?

My house was built in 62, with cast iron pipes. They failed and I had them re-lined (CIPP). My guest bathroom backs up to my master bedroom closet. The other day when the kids were in the bath, I ...
Anthony's user avatar
  • 11
0 votes
1 answer
50 views

concrete patio, grading, geotextile [closed]

I am about to make a concrete slab patio along the wall of my house facing the backyard (38' long house wall, 10' wide concrete slab). To ensure proper water drainage (now, water may stay next to the ...
Anar Guliyev's user avatar
0 votes
1 answer
445 views

How do you fasten interior walls to a post-tensioned slab?

I want to install French doors on an opening on the ground floor of my house. This will require building out a small interior wall to frame the doors as the opening is too big at the moment. We have a ...
Ian's user avatar
  • 299
0 votes
2 answers
158 views

Can a concrete slab with a 6 inch deep footer support a wall made of 8"x8"x16" concrete blocks that is 8 ft high? [closed]

Slab is reinforced with 1/2inch rebar. The footer is about 9 inches wide. This is located in Atlanta, GA. I am no soil expert, but there seemed to be a fair amount of clay in the dirt. Underneath the ...
Blake Seignious's user avatar
1 vote
1 answer
944 views

Crack in ABS drain pipe at slab

As pictured, this is my kitchen drain line and vent. It may be hard to see in the photos, but the 2" ABS goes into the concrete slab. Due to earth movement (my guess, and you can see the line ...
Ari's user avatar
  • 11
0 votes
0 answers
172 views

Is it okay to reroute this water heater line?

The slab under hot water heater 3/4" hot manifold was leaking, so I decided to have plumber reroute through the attic. The 3/4" copper that supplies hot water to bath manifold through the ...
Kenny Chenzy's user avatar
6 votes
3 answers
1k views

Increase Thickness of Concrete Pad (for BBQ Island)

I poured a concrete pad a year ago in preparation for a BBQ island that I'm building. Unfortunately, I was slightly off on the elevations and as a result, the pad is level with the patio pavers (was ...
Richard's user avatar
  • 107
-1 votes
1 answer
89 views

Total weight my slab can carry

I have a stilt and first floor .It have size of 10'x18'. It is concrete slab of 4" and it doesn't have reinforced. It has been supported by steel beam and column. Now I have a table of marble ...
Sajjan's user avatar
  • 1
0 votes
0 answers
64 views

Filling the holes for a concrete slab

There are two holes occured on 1st floor slab which are irregular in shape and able to see the ground floor which are having beams between it. How to fill those holes without disturbing the slab???
Venkat Chandu's user avatar
1 vote
2 answers
63 views

Slab Leak in Foundation [closed]

If there is a slab leak, will the water eventually come directly out of slab above the leak or can it come up in the surrounding are?
Glen's user avatar
  • 21
5 votes
4 answers
4k views

My bathroom slab is 2 inches lower than the rest of the home's slab. How should I level it?

I am renovating our primary bathroom in our 1958 home. I demoed the tile and decided to demo the dry pack used to float the bathroom. After getting the dry pack out it appears my bathroom slab is ...
s3aborn's user avatar
  • 53
0 votes
0 answers
119 views

Extend concrete slab on slope

We have an existing concrete pad that is 18’ wide x 20’ long. The slab is level but is built into a hillside so has poured concrete that goes from level at access point to about 2’ at rear. We would ...
Sophia Marner's user avatar
1 vote
1 answer
83 views

How can I determine if a prexisting slab on grade is frost protected?

I have a detached garage that was built sometime in the 50's. At some point it seems that an addition was made to it to create a shop. There was an old oil burning stove in there as well on the ...
LuckyURE's user avatar
0 votes
0 answers
85 views

PolyRenewal foam injection for settling slab foundation

My house is built on a concrete slab foundation and is 20 years old. Part of the slab, roughly 15'x6' in size under the kitchen, is cracking off from the rest of the foundation and settling down. In ...
Fijoy Vadakkumpadan's user avatar
1 vote
1 answer
79 views

can a professional distinguish between a previously sunk foundation and a currently sinking foundation?

I bought a house with the understanding that the foundation had sunk some, but that the structural problem had been permanently fixed and stabilized (with steel columns) in late 2019. However, I'm ...
Mathew Alden's user avatar
1 vote
1 answer
943 views

How would I go about replacing a small section of basement slab?

I would like to replace a small section (approx. 2'x3') of the basement slab. The crumbling section is near the foundation wall, which also has some damage from spalling. I have regraded the exterior ...
ErnChe's user avatar
  • 165
3 votes
2 answers
410 views

Is 13 inch X 8 inch hole left in basement slab a code violation in new construction? Drain plumbing repositioned and hole left void of fill/grout

New construction builder said to leave 8 inch by 13-14 jackhammered hole, made to reposition bathtub drain pipe in basement slab floor. Tub was set over to cover up hole. Bath walls and floor tiled. ...
Cheystal 's user avatar
1 vote
0 answers
118 views

What purpose would a flashing between the studwork baseplate and a concrete slab serve?

I have seen and read online that the baseplate is usually fixed directly to the edge of the slab. However, I also saw a passive house video on YouTube where the builder placed a rubber gasket under ...
Gerry's user avatar
  • 13
1 vote
0 answers
73 views

Fill the foundation cinder block?

Removed carpet from a lower level walkout in a 1985 Minneapolis house and found the patio door is set on the cinder block foundation wall. Planning on installing LVP. Should I clean the detritus and ...
L Floyd's user avatar
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