Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-18-2010, 11:00 AM   #1
Newbie
 
Join Date: Jun 2010
Posts: 1
Share |
Default

Concrete Patio drainage issues


I have a new raised patio that appears to be causing water to be forced against my basement and water is coming into the basement via cracks in the foundation wall.

The retaining wall built was filled with AB3 and fabric to keep the AB3 inside the wall. It is sloped away from the house (3" drop), except in the one section I note. The blocks used in the retaining wall were glued together. It's not water tight, but water does appear to have a difficult time "weeping" through it.

I had two engineers look at my patio to give me ideas on what issues might be causing the problems. Here is generally what they said.
(1) not pouring the concrete patio over the retaining wall as opposed to butting up to it which leaves a seem so water can get into the retaining wall.
(2) not using a better draining filler such as "clean gravel" as opposed to all AB3 which will retain water.
(3) not adequatly slopping in spots
(4) under ground conduits that might be directing water back to the house, because of the AB3 or concrete?
(5) not water proofing the foundation or draining the filler properly by the foundation.
generally, their concerns were with drainage both on the patio and in the AB3, and use of only AB3..
I've prepared a diagram of the (4) trouble areas and labeled them as Sec1 thru Sec4 with some pictures to help describe what is happening (patio_diag). The blue dotted lines is the general water flow that the engineers looked at with a house to see the direction water travels on the patio.

I also have more detail and pictures but I'm having trouble uploading them at the moment.




Attached Thumbnails
Concrete Patio drainage issues-patio_diag.jpg  

kozmo99 is offline   Reply With Quote
Old 06-19-2010, 06:02 AM   #2
Member
 
Join Date: May 2008
Location: Near Philly
Posts: 1,990
Default

Concrete Patio drainage issues


Is there a question? Not sure how anyone can really tell what the problem really is as the engineers' thoughts all are possible. I guess you could try the cheapest and easiest solution first and see what happens.
Does this patio have a roof? Have you addressed water drainage from gutter downspouts? How about yard slope away from the patio?

bob22 is offline   Reply With Quote
Old 06-19-2010, 06:57 AM   #3
Member
 
Join Date: Jun 2009
Location: atl & hilton head
Posts: 3,161
Default

Concrete Patio drainage issues


whoever installed the patio shouldda made certain to slope it AWAY from the house,,, forget the engineers - find a retired guy who knows why water runs downhill & how to properly waterproof conc block,,, otoh, if you've already pd TWO engineers, hire a pro waterproofer

doesn't matter what base was used,,, btw, foundation walls are NOT supposed to have cracks
stadry is offline   Reply With Quote
Old 06-20-2010, 09:49 AM   #4
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 6,932
Default

Concrete Patio drainage issues


So long as water on the patio slab flows towards the house, you must provide a way (possibly a pit with sump pump) to quickly drain practically all the water that ponds up against the house and get that water away from the house. Or roof the patio so rain doesn't get on it.

If you correcct the patio slope by putting a skim coat of concrete on it, water must not be permitted to pond elsewhere on the patio. Otherwise the water will seep between the skim coat and original slab and make its way to the foundation anyway.
__________________
Stop wasting time re-adjusting the pattern. Have several lawn sprinklers, one for each pattern.

Last edited by AllanJ; 06-20-2010 at 09:56 AM.
AllanJ is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Recycled Concrete Patio golfer2b Landscaping & Lawn Care 1 04-03-2010 06:36 AM
Concrete patio w/o expansion joints TrentJA Building & Construction 7 07-24-2009 03:28 PM
Ideas for deck over concrete patio and beyond-pics- bdobs Building & Construction 6 05-10-2009 08:58 PM
Concrete Patio sah Landscaping & Lawn Care 1 07-13-2008 07:27 PM
Cutting a Concrete Patio steve65 General DIY Discussions 4 01-31-2007 06:30 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.