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Old 12-30-2009, 07:42 PM   #31
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New Basement with Moisture Problems from Slab


this isn't a pricing forum as they'll vary measureably across the country,,, more importantly, WHY remove the present slab - just to place vapor barrier under the conc floor ?

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Old 12-31-2009, 01:11 AM   #32
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New Basement with Moisture Problems from Slab


Well Because I have done everything i can think of - Sumps Pump - Put in Outside Premiter Drains. Gutter - Resloped the Yard - Still have Damp Floors - - Humidity high Etc.. - Just not Healthy - Mold Growing or Mildew on Dry wall - Just Can't Get it stop? I am Concered about my inside wall sitting on the Slab - with Moisture Wicking Up - I am at pulling my hair out - So The Only right way is to remove the slab and see whats going on under there - deal with that and then put a VB Down and Repour? I am at a loss at this point!
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Old 12-31-2009, 07:48 AM   #33
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New Basement with Moisture Problems from Slab


eddie - That's a pretty drastic next thing to try and may not solve the problem.

I would suggest you revisit the the things you have tried. Something isn't right. Your description doesn't pass "the smell test"

Take some pictures of the outside of your house, front, back, left, right, from the outside. Wide shots, get the whole house, grade, landscaping, etc. in the pictures.
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Old 01-02-2010, 01:08 AM   #34
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New Basement with Moisture Problems from Slab


I would agree with you but I am sick of fighting with this - The only Thing I can think of is removeing the slab and put in a inside primiter drain the sump pump and a new VB and be done - I know I live in a swapy area - high water table and at a bottom of a hill - so all the rain and snow will run past my house in spring - I have ditches and stuff - but the water table is just high all year round - is levels about at about 4" below my slab. Yes it going to be lots of work but might be worth it - what do you think?
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Old 01-02-2010, 09:09 AM   #35
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New Basement with Moisture Problems from Slab


no, quite frankly i do NOT think it would be worth ripping out the floor, putting down some plastic and re-pouring. I think you need to re-assess the outside situation. Only way i can be convinced to do something inside is to see some pictures.
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Old 01-04-2010, 12:22 AM   #36
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New Basement with Moisture Problems from Slab


It Just seems Very Strange that it's the Middle of winter Here in BC and around -15 to - 25 Average the past 5 weeks and the water table has dropped lower than my 4 foot sump pump hole - but yet I still have damp floors - The Humidy in the house is very high and I am useing a wood stove to heat the house - I don't know but as far as I can tell there is no water under the slab this time of year - every thing is fozen and the water table is low - and I have moisture problems still?
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Old 01-04-2010, 10:34 AM   #37
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New Basement with Moisture Problems from Slab


Eddie - my guess is the floors are damp because they are colder than the room and moister is condensing on them. Think beer can out of fridge on a warm day, moisture on the outside of it. The moisture may not be comming up through the floor but rather from the air down to the floor.

Is it a small house? Just a guess - when you built the house you built it super efficient and air tight. There is no way for moisture to escape. You should be using vent fans in bathrooms and they should vent outside. Use the range hood when boiling water if that vents outside. Put a cover on your sump pit.

You may also need to install an air to air exchanger if your house is super tight.
A quick google search turned up this article
http://www.warmair.com/html/air_to_air_exchangers.htm
Are you running a dehumidifier?

As for the slab - the issue may be more a lack of an insulated slab versus lack of vapor barrier.
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Old 01-04-2010, 03:25 PM   #38
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New Basement with Moisture Problems from Slab


Brik, thanks for your time and input

Yes My House is very air Tight and I have the Bath room fans on all the time - my house is large 1250sq feet in the basement and then another story on top.

I have a neighbour who happens to be my brother inlaw - he built a new house 3 years before I did - and he has no problem with moisture in his basement and the only thing different bewetten our houses is his has polly under the slab - which his cement guy did for him and his basement is 5 feet deep and mine is only 4 deep and he is on a flatter spot of land with little drainage than I have. Polly under slab is the only difference. I have a cover over my sump pit already - I do not have a dehumidifier yet. Like I say my neighbours house is the same but with polly under the slab and Has no problems. So I still toying with the idea on a rip out the slab and pour a new one with polly and whileI am there put in a inside drain tile - might be worth it if I am planning to live here for life, wouldn't you say?
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Old 01-04-2010, 03:48 PM   #39
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New Basement with Moisture Problems from Slab


No, i wouldn't say that at all. I would say all the other things I have said but don't want to repeat myself too much. Post a picture of the outside of your house. Even just one from the front, a wide shot that shows the grade. The fact that your sump pit is 4' deep and dry I do not think that a new slab would be worthwhile. Millions of homes are built without plastic under the slabs, even in wet areas, and do not have issues. Something else is going on. I think the high humidity may coming from somewhere else.
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Old 01-04-2010, 07:14 PM   #40
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New Basement with Moisture Problems from Slab


OK Then Why When I put polly over the whole floor does the humdity drop from 65 - 70% down to 40% in a day or so??? - Could it be that the house is built on Clay - Can that change any thing - the Picture as an attachement - The grade in not that steep any more but I would say that over 30 feet is drops 3.5 feet - it slopping away from the house all the way around. Like I say when I put polly over the floor - the humidy drops down and stays down around 40 - 35% - and we changed nothing else. once I remove the polly and bang it back to 65 - 70 or even 75% - I get mold growing on the bottom of my dry wall! - what a mess and the sump pit is empty right now and still the humity is high once I remove the polly
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Old 01-13-2010, 09:26 PM   #41
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New Basement with Moisture Problems from Slab


So Brik the Yard Slopes away from the house - I don't have standing water buy the house - I am at a loss.
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Old 01-14-2010, 02:01 AM   #42
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New Basement with Moisture Problems from Slab


all, so far, is conjecture,,, take some cores & SEE what's below,,, test for compressive & water tx, too,,, only THEN will you KNOW what to do !

we waterproof bsmts & repair/enhance conc - occasionally we do the same when we can't ' guesstimate ' causes & design solutions,,, we guarantee our repairs & haven't given 1 back yet ! thankfully, our competitors take the really ' iffy ' ones, tho
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