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Old 11-15-2013, 10:19 PM   #31
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How to make up an Inch?


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Vinnie,

Remember the floor should be flat within 1/8" in any 10' space. Use a stiff perfect straight edge to be sure. Large tiles like yours are not forgiving.

The joists deflection is probably within minimum standards, but I would try to improve it while you're at this stage. Go ahead and sister as much as possible, and add bridging to help stabilize and share the loads.

So, you have no idea what species and grade the joists are? Have you looked for stampings? How old is the house?

Jaz
Thanks jazman

House is 1950.....joists in very good shape... All I can find stamped is some 4 letter acronym that I cannot make out.. then No.1.....

When sistering ... Is it OK to do partial span... I can get a 1q ft piece in.. Not the full 12.5?. I can rest one side on a wall plate...

Thanks

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Old 11-17-2013, 10:06 PM   #32
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How to make up an Inch?


I guess we know the joists are grade #1, that helps a little.

It's often difficult to sister with lumber the entire length. The mid 2/3's of the span is the most critical to sister if you can't go all the way to both supports. The sister does not have to be the same width if obstacles get in the way. Even 3/4" ply which is laminated and screwed helps.

Jaz
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Old 11-18-2013, 09:40 AM   #33
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How to make up an Inch?


Thanks Jaz,

I sistered each one this weekend. used 8 footers, 2 * 10, carriage bolts and Glue. Rock solid. I Will throw in some blocking when I get a chance.

What are your thoughts on Planiprep ff or planipatch? I have my room cleaned out, added 3/8 ply on top on existing and am ready to install Ditra. I am in good shape in terms of flatness in most areas, however there are a couple of small area's where I have an 1/8 to 1/4 dip. Every third Joist was sistered in the original build, and they have moved so I get a slight dip in this area in some spots.

Will screeding in some of this product to smooth out the dips be ok (and letting Cure) before I install Ditra.

Typically, I do not think this is much of an issue - except I am dealing with the 40" tile..and do not want any bumps in the road when installing

thanks

Last edited by vmcmahon; 11-18-2013 at 10:10 AM.
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Old 11-18-2013, 10:41 AM   #34
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How to make up an Inch?


This may be easer for us if you can snap some pics of what and or where you have sistered between joists.... You do need total flatness for that size of tile.
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Old 11-18-2013, 08:25 PM   #35
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How to make up an Inch?


Vinnie,

From their description I think I would use the Planiprep FF. Be sure to follow directions to a tee.

Does that 3/8" underlayment meet Mapei's requirements? Is it APA Group 1 exterior glue plywood?

This stuff dries fast, have everything ready.

Jaz
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Old 11-18-2013, 08:30 PM   #36
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How to make up an Inch?


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Originally Posted by JazMan
Vinnie, From their description I think I would use the Planiprep FF. Be sure to follow directions to a tee. Does that 3/8" underlayment meet Mapei's requirements? Is it APA Group 1 exterior glue plywood? This stuff dries fast, have everything ready. Jaz
Can't Vinnie just plain the dips with the same thinset as would be used for putting the ditra down?....
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Old 11-18-2013, 08:44 PM   #37
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How to make up an Inch?


Yea, he could bring the floor in plane with thin set if the dips are not large. But patching material works better cuz it's not as sticky and is easier to trowel flat. Thin set would also require to set much longer.

We've all done that in a pinch when not knowing the condition of the floor ahead of time. But Vinnie knows what has to be done and being it's his house he wants to do a first class job using the proper materials.

Jaz

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