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Framing A Covered Porch

 
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Old 12-12-2016, 01:01 PM   #1
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Framing A Covered Porch


I have a client that has an enclosed porch and they are asking me to rebuild it. Here's my question:
The slab (patio) that this is built on is level with grade and water has the potential to make its way onto the slab. I plan to install a french drain around the perimeter but I'm contemplating whether it would be a good idea to start the walls with two courses of concrete block then build the walls off of that.
The other option is to basically build the walls using PT for the bottom plate.
Any ideas would be welcome.

Thanks

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Old 12-12-2016, 01:05 PM   #2
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Re: Framing A Covered Porch


If water is getting in now, a pressure treated plate is not going to stop it. Are you sure there is a foundation under this slab? Laying block on top of the slab might work, but only if there is an adequate foundation there already.

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Old 12-12-2016, 01:14 PM   #3
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Re: Framing A Covered Porch


Warren,
Water is not getting in at this point but I want to build this right for any future issues.
As far as a foundation, I don't know. My guess is no, there is no foundation given the way other things have been built around this house. It looks to be a standard patio pour.
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Old 12-12-2016, 02:38 PM   #4
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Re: Framing A Covered Porch


Quote:
Originally Posted by jhicks226 View Post
Warren,
Water is not getting in at this point but I want to build this right for any future issues.
As far as a foundation, I don't know. My guess is no, there is no foundation given the way other things have been built around this house. It looks to be a standard patio pour.
So, with no foundation, what are you gonna set the blocks on, the slab?
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Old 12-12-2016, 03:26 PM   #5
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Re: Framing A Covered Porch


Sounds like it they're on a budget and just needs to be functional.

Start with 3/4 or 5x4 PVC on the slab. Create 3/4" gaps 20"-24" when putting it down. Add 2x4 PT, and another 2x4 PT. Get a bolt / lag system going, whatever looks best.

The second 2x4 PT is to raise it up to accept a 3" - 3 1/2" PVC baseboard, inside and out. Drill out the base to match the gaps in the PVC base. That's how the water gets out.

On a pre-sale recently I proposed drilling out the plate and insert PEX sleeve to let the water out.

There are many porches with trap door type kick plate bottoms, but they're usually old growth, 70 yrs plus. Doug - Fir may be ok for the trap door method.

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Last edited by We Fix Houses; 12-12-2016 at 03:29 PM.
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Old 12-12-2016, 03:31 PM   #6
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Re: Framing A Covered Porch


IMO - if you put block down with no foundation It'll crack up in a few years, maybe less.

Look how the slab is doing against the wall ? Not a perfect indicator but worth a look.
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Old 12-12-2016, 03:43 PM   #7
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Re: Framing A Covered Porch


Quote:
Originally Posted by jhicks226 View Post
I have a client that has an enclosed porch and they are asking me to rebuild it. Here's my question:
The slab (patio) that this is built on is level with grade and water has the potential to make its way onto the slab. I plan to install a french drain around the perimeter but I'm contemplating whether it would be a good idea to start the walls with two courses of concrete block then build the walls off of that.
The other option is to basically build the walls using PT for the bottom plate.
Any ideas would be welcome.

Thanks
If you want this done right... check everything out, come up with a design and tell them to do this right this is what needs to be done and this is what it will cost you.
If you don't know, tell the HO to get someone who knows, like an architect, etc, and have them check current condition, come up with a detail and get building permit if needed.

To sit and contemplate without knowing all the facts it's a waste of time.
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Old 12-12-2016, 05:19 PM   #8
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Re: Framing A Covered Porch


I don't see a location for you but, I am going to assume you're in a region that needs footings. Take a shovel and dig my man. Dig on the outside of the patio slab. if you find the bottom of the slab and no continued concrete for footing, you have your answer. If the home has footings, whatever structure in tied to it should have footings. If you find it doesn't have footings the only real solution should be tear the slab out and get one in. Expensive, but do you really want to inherit someone else's poor craftsmanship? Or worse, get sued because the building separates from the home?
If you find it has footings, I think you are on the right track with block or maybe pouring a curb wall with a water stop and keyway in it. I believe our code here is 18" above finish grade. Good luck
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Old 12-17-2016, 08:38 PM   #9
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Re: Framing A Covered Porch


Are you in a frost zone? If so maybe Canadian style flat insulation placed around the SOG, If you go block, Use bond beams both courses, pin to slab every 16" vapour barrier over old slab 4" to 6" of washed pea rock for varmint control.

If a dug frost footing is required, increase the foot print to equal the Slab + the width of the trenched in footer, abandon the slab in place, as above with block, single bond beam. This add 6 to 8" in the rooms depth, a real increase in the utility of the remodel.

3rd alternate: floor saw the edges of old slab with walk behind-concrete saw, trench in footers at old wall line. Use wide chain, install foam on exterior of pour.

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