Advice Needed On Small Addition

Fwells11

I have been thinking about adding a small (5'x15')addition on the side of my home for a bar. Before I get involved with the city and sub contractors I want to figure out how much is is going to cost. If it looks like it will get out of hand I want to be able to pull the plug on the entire idea before it costs me a great deal.

I have drawn up my idea in Sketchup and thought I would get some advice from the talent on this board. The archway would be built into the existing 6" framed perimeter wall that bears the load of a roof. The window is currently in the middle of the wall but the pics show it being ultimately relocated to the right side. The house sits on a slab.

Most of the stuff is pretty straight forward but the header beam over the arch is what I have no idea about. How far to each side of he opening framing members would the beam have to run? Bear in mind that relocating that window will force some additional framing modification. The wall to the right with the archway in it used to be a bearing permiter wall too before the previous home owner remodelled.

Any thoughts would be much appreciated. Pics attached.

TIA

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BattleRidge

I dont know where you are and what codes you have and such, so Ill tell you what I would do on my house. Really you have a ten foot span there I would just put a glulam that is sunk in about a foot on both sides and strap it down. Im not going to tell what size to use but a foot should be plenty with a stud pack in there.

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ScipioAfricanus

You might want to rethink the whole giant opening in the roof idea. Most pros here will concur that this will let in too much rain water, you want just enough to water the plants but not too much.
As for pricing I would say in the range of $50K to $1Mil. give or take depending on if you have illega...oops, sorry...undocumented workers or just drunken hacks on your project. We could narrow the price down for you if you can give us just one more view from that professional set of plans you have there.

God I hope this helps.

And thank you for the post.

Andy.

Fwells11

Thanks for the response Battleridge. I appreciate your thoughts and it was exactly the kind of feedback I am hoping for.

I can't tell whether your response is supposed to be funny or not ScipioAfricanus. It wasn't very amusing and it didn't offer anything useful. Thanks anyway I guess.

Keep the thoughts coming please, anyone.

send_it_all

I disagree. I actually laughed so hard I might have pooped a little.

deck king

Codes vary town to town and state to state, in the Chicago area your addition would cost about $40,000.00 ( retail ) Architects plan and permit not included.
A 10' span ( depending on roof load) could be span by a double 2 x 12 header, A gluelam or microlam would be better. I am not sure going out 5' is worth the cost. Going out 8' would cost just about the same price ( or be real close) and give a lot more value to the home.

kirkwahl

Once you head off that roof load with a gluelam, the construction is relatively straight forward. I agree with Deck King, increasing the room size to 8' X 15' should only add a few thousand to the overall cost, but would definitely increase the overall value of the property. In Michigan you should be able to add a 120 sqft room for less than 18,000.

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ChrWright

Yes, thanks for the coffee shower I just gave my screen...

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silvertree

Oh man, good one ScipioAfricanus

If people would just read some threads before asking certain
questions....

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thom

WAIT.

Now hold on guys. From the second picture it appears the beam will be holding up the existing roof as well as the addition roof. How the H*ll can you spec a beam without calculating the existing roof loads?

The first picture seems to indicate there might be a second story floor load as well. Do you guys just ignore loading when specking your headders and beams?

neolitic

Gee, for a minute there
I thought Scipio and I were
the only ones who couldn't
figure out what was going on
by looking at the drawings.

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knucklehead

Just run a header all the way across they arch and the window. and put another window on the left. Or maybe a door. Once you get that hdr/beam and your peirs under the slab you can pretty much do anything you want there.
What is Sketchup?

Glad to help. Things like this is why I really like this CT place. It gives me an opportunity to help people with some of my knowledge and experience.Work is really slow here so this gives me something to do.

Fwells11

From original post:
I plan on extending the original roof rafters to keep the addition looking integral to the rest of the house. The roof is clay tile and there is no second floor above it. The roof in the picture of the addition is is an extension of the existing roof.

Here is another pic from an angle that shows the roof line. You can see that the addition roof is really just an extension of the existing roof. I don't know whether Plan Check would permit this or not, so its the kind of thing I am hoping to get a discussion on.

Extending the roof out that far also limits the distance I can come out from the wall before the eaves are too close to the ground. Coming out 5' puts the lowest point of the eaves at slightly under 7' from the ground which may already be too low?

Thanks again to everyone that has left comments.

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Fwells11

Sketchup is a free piece of software from Google. It makes drawing scale diagrams amazingly quick and accurate. It also renders in 3D and has the ability to move the camera around at will with unbelieveable zooming.

Because it draws in scale it has a measuring tool that can be used to take precise measurements of just about anything. If you take the time to draw something to scale once, you will never have to go and measure it again so long as you have the drawing.

There are also a ton of models created and posted by other people you can import into your own work.

There is a Pro version and a free version. My cheap ass uses the free ver. I have never used the Pro ver but if it has the ability to create material lists it is almost certainly going to become and industry standard tool.

I havent made enough posts to give you a clicky link so here is the link you can cut and paste into your browser:

sketchup.google.com/download/gsu.html

I sound like a bloody Sketchup salesman...

deck king

How tall is the exterior wall to grade ? from the picture, it looks like your exterior wall will be about 4' tall.

In response to calc. roof loads, If you can't see it from my house, you don't need to!

Also in the first diagram it looks like you actually have a standard header and a second beam below it to create the arch. as far as structural supports go. a double 2 x 12 header can span 15'6" in a normal capasity. also make sure to have a double cripple under each end.

ChrWright

How tall is the existing outside wall (from plate to plate)?

What is the existing roof pitch that you are extending?

That new outside wall is going to be a lot shorter than you think I'd wager.

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rbsremodeling

We don't need any Load bearing specs its 2 or 3 2x12 and 1/2" ply nailed together. What is there to calculate? That's how we roll up here keep that fancy NM load bearing calculation stuff.

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Joe Carola

9' 8". It's shows it in his first post second picture.

With a 5' projection and a 9'8" inside wall and a 7'6" outside wall, it's around a 5/12 pitch.I


7'6" first post first picture.

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ChrWright

Missed that...my apologies...

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Fwells11

You are right Joe, the roof is a 5/12 pitch. The outside wall is 7'6" plate to plate.

Can you see a problem bolting rafter extensions on and extending the roof?

Thank you for that info Deck King.

My slab is at least 5" thick but may well be 6". I'll dig down a little tomorrow and confirm if I get time. Do you think I would need any reinforcement under the slab directly under the king/cripple studs?