House Addition With Crawlspace/partial Basement - Building & Construction - DIY Chatroom Home Improvement Forum
Advertisement


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

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

Reply
 
Thread Tools
Display Modes
Old 02-23-2018, 09:48 AM   #1
Member
 
Join Date: Nov 2015
Location: Suwanee & Ellijay, GA
Posts: 69
Rewards Points: 138
Default

House Addition with crawlspace/partial basement


We are at the point of having real blue prints drawn up for adding onto our existing house. The current house is on a crawlspace with a dirt floor & covered with plastic.

We are considering adding a partial basement to the addition since we already have a lot of slope on the yard and would not require a lot more digging. We know the end result will cost more and at this point, just questioning the way it should be built to be sure it's waterproof. This is a drawing and the red on the left is existing, and blue on the right is the proposed addition. The numbers are just for showing the slope, and roughly the amount we now have on the existing house. There not exact and all of this will be designed & built to code as not trying to figure it out ourselves. It's what we would expect it to look like, if we did the same crawl space to match the existing:

House1 by Cool Runnings, on Flickr


Since we have so much slope, we are considering adding a full height wall to create a basement in the back 1/4 of the structure, that will end up with a concrete floor. This will be used shed type storage, not finished living space as just need it for that, and if needed, a storm shelter. We would want to try and make it as waterproof as possible. This is what we are thinking:

house2 by Cool Runnings, on Flickr


Again, not such much as exact lay out as that will be done by the builder, as we are just trying to decide if we should include it in the drawings.

The black lines are what I would expect the foundation drain lines to roughly look at.

One question we are wondering is if we have this wall in red, between the basement and crawlspace built, would anything need to be done on the crawlspace side, other than waterproofing? I would not think it would need any drain lines as seems like those outside should get most all of it, and then again, not sure how they could drain to the outside like that.

The second question, is if we had it designed this way, have the plans drawn up, and change our minds later, if it would be a big deal for the builder to just omit the wall? I am thinking maybe the designer might could add this wall to where it's not load bearing, basically making it optional when it gets built.

Thanks for any input.
Eagle_and_hawk is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-23-2018, 05:17 PM   #2
Naildriver
 
chandler48's Avatar
 
Join Date: Jun 2017
Location: Young Harris, Georgia
Posts: 8,361
Rewards Points: 1,350
Default

Re: House Addition with crawlspace/partial basement


The best solution is to waterproof that red wall all the way down to the footing during construction, not after. Also you want to mitigate any possibility of water infiltrating the crawlspace, so having proper drainage OUTSIDE the old upper wall is a must. French drains are common, depending on your elevation and the slope of the yard to the sides.
__________________
Larry......
Half of Communications is Listening, and You can't Listen with your Mouth.
chandler48 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-23-2018, 05:35 PM   #3
retired framer
 
Join Date: Jun 2017
Location: Fraser Valley BC Canada
Posts: 31,352
Rewards Points: 6,362
Default

Re: House Addition with crawlspace/partial basement


Our subdivisions are on mountains here so every house has a walk out basement you have room to place windows on the side near the low end as well as the low end.
Our crawlspaces have a min. height and a skim of concrete on the floor the cost difference to go full basement is cheap in the real world.

The blue connector to the house would be left as crawlspace with that foundation bridged to the full foundation allowing for the drain to go below.

Water proofing is not tricky but has to be watched carefully.
Nealtw is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-23-2018, 05:37 PM   #4
Naildriver
 
chandler48's Avatar
 
Join Date: Jun 2017
Location: Young Harris, Georgia
Posts: 8,361
Rewards Points: 1,350
Default

Re: House Addition with crawlspace/partial basement


Great idea on the drainage below grade on the addition as a "just in case".
__________________
Larry......
Half of Communications is Listening, and You can't Listen with your Mouth.
chandler48 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools
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
Moving air long distance - Ranch House kheflw HVAC 16 12-11-2017 04:13 AM
Insulation of basement foundation with a basement addition Nuitari Insulation 1 09-19-2015 11:31 PM
Need suggestions for leaking basement addition Sb16 Building & Construction 5 06-28-2015 12:30 PM
basement house inspections/ problems base_build_01 Building & Construction 1 08-01-2011 09:38 AM
Bathroom addition in attic to basement drainage tmtoddsr Plumbing 3 05-16-2011 08:21 PM




Top of Page | View New Posts