Pre-planning: Converting Front Room Back To Porch - Building & Construction - DIY Chatroom Home Improvement Forum


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 11-06-2011, 12:38 PM   #1
I ask the impossible!
 
Join Date: Aug 2010
Location: Royal Oak, Michigan
Posts: 1,074
Rewards Points: 508
Blog Entries: 7
Default

Pre-planning: converting front room back to porch


I'm in the midst of a lot of work and I'm approaching floor joist and subfloor replacement. The front room on our house seems like it was originally a porch which was converted to a part of the interior space.

So here's some relevant details of the project: The house is on concrete blocks and was built in 1917. There is a triple 2x6 beam in the center and 2x6 floor joists butt over that beam. These are on 16" spacing. Under the front room there are 2x4 joists on 24" spacing.

I am installing new support structure specified by an engineer, although I am making modifications due to interferences - I've run the modifications by the engineer and the city inspector, and they have no issues since I am increasing from the original specifications. For example, originally the triple 2x6 beam was remaining, and 2 triple 2x10 beams were going in at the outside. I am getting rid of the center 2x6 and using 4 triple 2x10 beams, replacing the 2x6 joists with 2x8 joists which will be lapped over the 2nd and 3rd beam.

So for the porch, I'd like to know if there's requirements related to the height of the porch floor relative to the floor of the house. If it's an open porch, does the porch floor have to be lower to prevent water intrusion? Is there a height requirement that relates to tripping hazards?

At this point my primary concern is planning for the floor joists, and if the floor of the porch is the same as the interior floor it's 2x8 joists on the beams, if it's lower then maybe I have to notch 2x8 joists, or if it's too complicated maybe I stick with the porch being enclosed.

Advertisement

__________________
Please do NOT consider any "before" picture of my house as any kind of endorsement of any particular construction method. In fact, you should probably assume that if I post a "before" picture, I am posting it because I am soliciting advice on a proper replacement for one of MANY things done wrong by a previous owner.
WillK is online now   Reply With Quote
Old 11-06-2011, 12:56 PM   #2
JOATMON
 
ddawg16's Avatar
 
Join Date: Aug 2011
Location: S. California
Posts: 7,657
Rewards Points: 2,626
Default

Pre-planning: converting front room back to porch


If an open porch, you want it lower....I don't think there is any standard.....I'm putting in a balcony on the second story of my addition....and the floor level on it is 2" lower.

Sounds like you have a lot of 2x beams.....have you considered going with a PSL beam? I think you could get more strength with less.....surprised the engineer didn't spec it.

Another option...instead of being on top of the main beams, you could use joist hangers....I would suggest that over notching joists. Not to mention the fact that I don't think you can notch the joists any usable amount.

Advertisement

__________________
Even if you are on the right track, you will still get run over if you just sit there.

My 2-Story Addition Build in Progress Link ... My Garage Build Link and My Jeep Build Link
ddawg16 is offline   Reply With Quote
Old 11-06-2011, 01:42 PM   #3
I ask the impossible!
 
Join Date: Aug 2010
Location: Royal Oak, Michigan
Posts: 1,074
Rewards Points: 508
Blog Entries: 7
Default

Pre-planning: converting front room back to porch


My understanding, which I don't know that it's necessarily correct, is that 1/3 is allowed, and I was considering building my beams up to the existing 2x6 and later replacing with 2x8 but notching with precision over an entire house would be difficult... Might be that it requires a ledger board or joist hangars... I also was consider going to 2x6 joists for the porch. Being that the porch doesn't have the load of a second floor above it, and also being that I'm reducing the span, I'm sure 2x6 should be okay.

I'd check span tables before I went through with it, but regardles I mostly am interested in understanding any floor level placement requirements there may be for the time being.

I'll consider the joist hangar option, I think an 8" would probably be plenty for water intrusion and make the step fairly obvious. What I would need to understand, though is how do I handle the part that is outside the beams? Of course, I don't think I'd be entirely opposed to losing that last 6" either.

And another question comes up, is there any way that an open porch could be built where the triple beam underneath doesn't need to be PT? One beam is already started using non-PT douglas fir.
__________________
Please do NOT consider any "before" picture of my house as any kind of endorsement of any particular construction method. In fact, you should probably assume that if I post a "before" picture, I am posting it because I am soliciting advice on a proper replacement for one of MANY things done wrong by a previous owner.
WillK is online now   Reply With Quote
Old 11-06-2011, 01:47 PM   #4
I ask the impossible!
 
Join Date: Aug 2010
Location: Royal Oak, Michigan
Posts: 1,074
Rewards Points: 508
Blog Entries: 7
Default

Pre-planning: converting front room back to porch


Quote:
Originally Posted by ddawg16 View Post
Sounds like you have a lot of 2x beams.....have you considered going with a PSL beam? I think you could get more strength with less.....surprised the engineer didn't spec it.
I basicly am constrained on that matter to what I can work with myself and what I can snake through the crawlspace and all the pipes, wires, pillars of concrete blocks and furnace that is in there. There would be no way I could easily get a 1-piece beam into the crawlspace and into position.

Demolition of the house would've been the easy way to get everything done, but we're buying on land contract and living in the house so we can't drop the property value on any kind of interim basis without the sellers approving, and I can't get into anything that would leave a huge hole to outside up for more than an hour or so at a time. So I'm stuck doing this the hard way.
__________________
Please do NOT consider any "before" picture of my house as any kind of endorsement of any particular construction method. In fact, you should probably assume that if I post a "before" picture, I am posting it because I am soliciting advice on a proper replacement for one of MANY things done wrong by a previous owner.
WillK is online now   Reply With Quote
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
Concrete Front Porch Structure bheher Building & Construction 1 10-17-2011 10:56 PM
water leak into basement just below front porch front door entry. roncarolron Building & Construction 1 10-27-2010 10:19 AM
raising front porch columns joliver Roofing/Siding 8 09-16-2009 05:15 PM
replacing metal back borch porch with shingles nurse47557 Roofing/Siding 1 05-22-2008 12:10 AM
Raising Doorway Height (load bearing?) treefrog Building & Construction 6 02-25-2008 10:11 PM




Top of Page | View New Posts