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Unread 09-06-2020, 07:25 PM   #1
johnston101
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porch tiling help needed

Hi. We need some advice for tiling our porch.

Will our porch joists be strong enough and not deflect too much for this tile?

The tile is from HD : Daltile-Quarry-Red-Flash-6-in-x-6-in-Ceramic-Floor-and-Wall-Tile

Right now we have 2"x7.5" joists, 19.2" or 20" o.c. (real 2" thick)

they span 14'
the porch has 5 of them and about 8' deep

The home was built in the 1920s, so whatever the wood type from then. The floor is 3/4" floorboards, tongue and groove. This porch is directly above the basement.

I'm attaching pictures.

Possible with these joists? If so, what system would you recommend?

Thanks for any help!
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Unread 09-06-2020, 07:42 PM   #2
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Welcome, Jack.

A geographic location in your User Profile would be helpful here.

That porch is not enclosed at all?

The floor does/does not slope away from the house at least 1/4" per foot?

Your joists at 14 feet unsupported span, regardless the species, are overspanned for a design deflection of L/360 or better, the requirement for a ceramic tile installation.

Let's start there and see where it takes us.

My opinion; worth price charged.
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Unread 09-06-2020, 08:04 PM   #3
johnston101
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Oops, sorry. Baltimore, MD. I believe I just updated it.

The porch has a roof. I'll attach a picture. Really only near the steps get a little wet.
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Unread 09-06-2020, 08:21 PM   #4
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How about slope away from the building, Jack?

All your neighbors gonna tile, also, or just you? Are there physical barriers in the floor between those units?
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Unread 09-06-2020, 08:27 PM   #5
johnston101
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I can check tomorrow. I won't be there until the morning. I'll use a level and tape measure.

Thanks!
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Unread 09-06-2020, 08:27 PM   #6
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Even doubling the joists you have there is probably still not enough, considering the span and spacing.

Another issue: would you be willing to put a layer of plywood (1/2" or maybe 5/8") over the deck, followed by a tile membrane before setting tile? Would the extra thickness cause a problem?

Looks like a step up, at least on one side, CX.
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Unread 09-06-2020, 08:28 PM   #7
johnston101
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Just us tiling. Yes there is a wall dividing each unit. It looks just like the front half wall.
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Unread 09-06-2020, 08:30 PM   #8
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adding 3/4" is ok. we were planning on it.

what type of membrane? we have room for any membrane thickness too.

Thanks!
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Unread 09-06-2020, 08:35 PM   #9
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sidewalls are brick that divide each unit.
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Unread 09-06-2020, 09:04 PM   #10
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Several of the tile membranes are 1/8" thick installed.

So in the first picture it looks like brick steps, but the second is pre-cast concrete steps. Which one is yours?
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Unread 09-07-2020, 09:33 AM   #11
johnston101
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Hi again. Sorry for the delay.

The exact house is the one with the brick steps. The porches are separated by more brick. The door is very high off floorboards, so can accept new thick layers.

The slope on the porch seems good. It's around 1/4" per 12". It even has its own gutter near the front brick.

We have some temp plastic down right now, so just ignore that.

See new pictures with this new post.

Thanks!
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Unread 09-07-2020, 10:42 AM   #12
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I think you'd first have to address the structural issue and determine how your going to bring that up to the minimum requirements for deflection.

So would your tile stop at the first brick step, or were you planning to cover it?
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Unread 09-07-2020, 11:02 AM   #13
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hahaha

yes, that is the purpose of this thread, the structural issue.
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Unread 09-07-2020, 11:37 AM   #14
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There's only two ways to do so. You can either sister up the current joists if that's possible, and we don't know that yet, or you can install a mid-span beam to reduce the unsupported span of the existing joists, and we don't know if that's possible either.
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Unread 09-09-2020, 09:01 AM   #15
johnston101
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What do you think about adding a load bearing side closet to shorten the span of the joists?

Can I also add sister joists that would rest on new closet, but not go into brick on the opposite side?

Anyone know how to use the deflection calculator, if I would do the above setup?

Thanks!
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