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Old 10-19-2017, 10:03 PM   #16
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Re: Attach a Concrete Slab to a Frame Structure


Have to see what the floor and roof plan looks like, too.
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Old 10-19-2017, 10:09 PM   #17
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Re: Attach a Concrete Slab to a Frame Structure


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Have to see what the floor and roof plan looks like, too.
The existing wall will still support the roof and the side walls would support
a girder if that wall will be removed
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Old 10-19-2017, 11:59 PM   #18
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Re: Attach a Concrete Slab to a Frame Structure


The house is 32' wide and 34' long (1088 s.f.) with a hip roof and 9' ceilings.

The siding will be 7-1/2" into the soil and I think I the soil needs to be at least 6" from the siding, so I need to remove 13", or so - not as bad as I thought.
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Old 10-20-2017, 12:33 AM   #19
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Re: Attach a Concrete Slab to a Frame Structure


Why do you hate the crawl space?

I greatly prefer a crawl space to a slab-on-grade.

I think you really need the entire thing designed for you and not piecemeal designed on an internet chat forum.

You may not need engineering from a licensed engineer and can probably get away with using the prescriptive methods outlined in the code. You are going to have to dig footings for a slab if you decide to go that route. I do not recommend SOG though for your situation. In my opinion, a raised floor is best here.

Hey, I do this **** for a living, I know whereof I speak.

Dirt is easy to dig out relative to other house building issues. And there are building techniques that would eliminate a lot of the excavating if that is a big concern.

Andy.
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Old 10-20-2017, 12:44 AM   #20
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Re: Attach a Concrete Slab to a Frame Structure


Or you could bring the foundation up in the back where the ground is higher.
These two pictures are the extreme case like what we build here.

These two pictures show what I have been trying to explain.
I n the back where the wall is high the floor will be poured right on top of the footing but near the front the footing has to be deeper for frost protection.
See the wall in the front of the first one the bolts for the wall are sticking out of the foundation. The floor does not sit on a wall.
The second has the floor level with the wall in the front.
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Old 10-20-2017, 10:59 AM   #21
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Re: Attach a Concrete Slab to a Frame Structure


Again, thanks for the replies.

Nealtw, I see what you mean, the floor would be below grade and the foundation wall would be as far above grade as necessary and I would step my siding up at some point. I notice in your photos that there is no concrete block, strictly poured vertical walls. I like the poured walls instead of block. Most folks around here use block.

AndyGump, I currently have a sealed crawlspace. I put the white reinforced plastic on the floor and walls. I ran a supply duct down there from the HVAC and I run a Santa Fe dehumidifier. I also have a remote thermo-hygrometer. The RH in the crawl is at 40%. It is dry and clean and bright down there. Before I sealed it, I had water dripping from my floor joists, horrible musty odor and spiders all over the place. I now know how to control the moisture, but I thought a slab would be much simpler and probably cost less than a crawl. And I am certain it would be less maintenance.
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Old 10-20-2017, 11:01 AM   #22
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Re: Attach a Concrete Slab to a Frame Structure


Nealtw,
I like your idea of removing the entire rear wall. It would make it much easier to tie the new to the old.
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Old 10-20-2017, 12:23 PM   #23
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Re: Attach a Concrete Slab to a Frame Structure


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Again, thanks for the replies.

Nealtw, I see what you mean, the floor would be below grade and the foundation wall would be as far above grade as necessary and I would step my siding up at some point. I notice in your photos that there is no concrete block, strictly poured vertical walls. I like the poured walls instead of block. Most folks around here use block.
We are in an earthquake zone and never see block foundations.
The slab in a slab on grade does not care where it is put. At the bottom of the wall in a basement or inside the top of a wall like you have.

Like I said I would protect the edge of your floor and make it strong enough and pout concrete against it.

Your drawing looks more like what we call a pan slab that we use when building on soil that is more like jelly.
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Old 10-20-2017, 12:38 PM   #24
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Re: Attach a Concrete Slab to a Frame Structure


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Nealtw,
I like your idea of removing the entire rear wall. It would make it much easier to tie the new to the old.
If you are looking at the tails of the rafters or jacks on that wall a single or double girder truss would do it..
You would put a bigger footing on each side where it meets the wall and other footing to carry the weight of the roof.

The procedure goes something like this.
Cut the roof and tails off flush with the outside of the wall.
Remove the nails holding the trusses to the wall plate
Pry up a truss and slide a hanger under it facing out. Repeat on all trusses.
place the girder against the the ends of the trusses and nail hangers in place.

Finish installing the trusses and roof, there will be a valley set to sit on top of the old roof to join the two.
Once the roofing is on and water tight the wall or any portion of the wall can be removed. Only then is when we would pour the floor concrete.
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Old 10-20-2017, 12:56 PM   #25
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Re: Attach a Concrete Slab to a Frame Structure


Here is a pic of the little house. The lot is 50' x 174'. I am also going to screen in the front porch and change the color of the railing.
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Old 10-20-2017, 01:14 PM   #26
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Re: Attach a Concrete Slab to a Frame Structure


Quote:
Originally Posted by Nealtw View Post
If you are looking at the tails of the rafters or jacks on that wall a single or double girder truss would do it..
You would put a bigger footing on each side where it meets the wall and other footing to carry the weight of the roof.

The procedure goes something like this.
Cut the roof and tails off flush with the outside of the wall.
Remove the nails holding the trusses to the wall plate
Pry up a truss and slide a hanger under it facing out. Repeat on all trusses.
place the girder against the the ends of the trusses and nail hangers in place.

Finish installing the trusses and roof, there will be a valley set to sit on top of the old roof to join the two.
Once the roofing is on and water tight the wall or any portion of the wall can be removed. Only then is when we would pour the floor concrete.
I like it. I am going to codes on Monday - I will let you know what they say. In the mean time, I am going to draw the new roof with the girder trusses.

Thanks so very much.
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Old 10-20-2017, 01:37 PM   #27
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Re: Attach a Concrete Slab to a Frame Structure


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Originally Posted by RustyRealtor View Post
I like it. I am going to codes on Monday - I will let you know what they say. In the mean time, I am going to draw the new roof with the girder trusses.

Thanks so very much.
I think you want to talk to the truss company first. They would give you an idea of the weight that will be on the point loads.
They will need the pitch of the old roof the depth of the building so they can figure the max height and the need the the measurement from the top of the old wall to the under side of the sheeting above it. They call that the heel cut.

The will also ask if you have just rafters, rafters and ceiling joists together or apart or if you have trusses.

If you have trusses, you will have one or two girders going one way and jacks hanging from those, so they will want to know if you have girders or jacks landing on the wall. It would make a big difference in the weight carried.
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