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Unread 01-09-2016, 12:26 PM   #16
cx
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If you intend to bond anything to that subfloor, Ali, you need to remove that drywall compound. I'd recommend you go down to a 36-grit disk on your sander to begin and a 7" angle grinder would serve you much better than a RO sander to do the rough work. You'd likely do even better installing a second layer of nominal half-inch plywood over what you've got there, even though you'd actually want the subfloor cleaner than it is even for that application.

My opinion; worth price charged.
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Unread 01-09-2016, 01:13 PM   #17
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CX,

That's bad news! I've got my work cut out for me then. Any good way to mitigate the dust? I'll likely have to encapsulate the kitchen before I start.
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Unread 01-09-2016, 02:13 PM   #18
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Encapsulation is common for us. Blue painters tape is our friend. Might want to consider buying stock in 3M.

A course grit flap sanding disc will work. It would be great if you could find a dust shroud to fit. Don't bother with the cheapie ones. DustBuddie is excellent.

When the weather is cooperative, we place a huge fan pointed out a door or window to create negative air pressure.
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Unread 01-09-2016, 02:16 PM   #19
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Dust is always a problem with operations like that. We would generally recommend the use of water, but that's not at all a good idea over OSB. A good dust shroud and shop vacuum with your angle grinder can help a great deal, but you'll likely still wanna seal off the area with poly sheeting. Great PITA, but pretty common procedure in remodeling projects.

And when you get the floor clean enough, be sure you choose a thinset mortar whose manufacturer recommends it for use over OSB.

I'd still rather see you add a second layer of plywood, but that's your choice.

My opinion; worth price charged.
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Unread 01-09-2016, 02:30 PM   #20
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Thanks Paul & CX,

I'll likely buy a 4.5" flapper simce I have a decent 4.5 angle grinder handy. Hopefully they make dust shields that are suitable. I'm not a fan of encapsulation especially in our house since we have 14' cathedral ceilings at the end of the kitchen meeting the dining area but I have done it before for ceiling repair I had to do previously.

CX, I'm considering the plywood, just don't know if the budget will allow just yet

Flexbond should be good over OSB but I'll double check the specs.
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Unread 01-09-2016, 04:01 PM   #21
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got a home depot near by???? See if they have a floor edger in tool rental (about 40.00 for they day) and get some 36 grit disks also available there. It'll have a bagger on it to aid in keeping the dust down and make short work of the job too.
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Unread 01-09-2016, 05:01 PM   #22
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Greg, if I didn't know you were in SC I'd say you were following me around (or have psychic powers). I was at HD when you posted this and left with the edger despite the guy at tool rental trying to condescendingly explain the difference between plywood and OSB to me and urging me not to rent the tool... that's what I get for being honest. I had to resist the urge to tell him that if he knew what he was talking about he wouldn't be working at HD but I decided to remain pleasant.

Wish me luck! If this works I'll ship you a beer, or three.
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Unread 01-09-2016, 06:55 PM   #23
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MMMM.....Beer Good luck, I do it all the time for just such a thing. I bought a used, not so good for hardwood floors anymore, edger from a friend of mine who is a really good hardwood guy. He borrows it back all the time to sand down seams that have peaked in the subfloor so he doesn't mess his good one.
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Unread 01-09-2016, 09:54 PM   #24
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Greg,

I owe you one, worked like a charm! I won't say it wasn't a PITA, but the kitchen is done. I tried running it with the bag, but it was too dusty so I ran it with my 6hp shop vac hooked up. Clogged the filter with mud and OSB dust a dozen times but thankfully the mild weather allowed me to go outside and shake the filter debris loose. I also burned up 10 36grit sanding discs...

I've officially earned my beer for the night! Below you can see how angry I was lol
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Unread 01-10-2016, 12:22 AM   #25
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That looks much better.

Hurry up and get that saw dirty before someone steals it.
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Unread 01-10-2016, 12:38 AM   #26
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Thanks Davy! All that hard work and I haven't even set the underlayment in place - props to you pros for doing this every day

Trust me, I'm itching to get it fired up... Speaking of the saw, do you guys recommend using the xp blade that it came with or should I shoot for the top of the line a buy an alpha porcellana from Amazon? I'll be cutting a few hundred square feet of thick porcelain and 15 sq ft of 6x18 glass. In the future, I'll be tiling the vanity tops in both bathrooms with marble and mosaic.
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Unread 01-10-2016, 12:44 AM   #27
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Check out the blade and see if it's a porcelain blade or just a ceramic tile blade. I would probably buy a porcelain blade if you're installing porcelain tile. It will cut better with less effort and will last longer.
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Unread 01-10-2016, 08:35 AM   #28
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The XP blade that came with it will do the trick for your floor. Get a glass blade for your future project. Paul ( Houston Remodeler ) has a good video of some glass cutting techniques. Check the " Liberry "
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Unread 01-10-2016, 12:18 PM   #29
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Thanks Davy & Greg,

Looks like I'll put the xp to good use for the porcelain and marble later.

Greg,

I could not locate Paul's video in the Liberry and I also looked through a few pages of his posts with no luck. The only glass cutting/blade posts I saw while briefly looking were related to his recommendations of Montolit blades.

I looked up thr CPV250 and it costs half as much as I paid for my D24000 haha. Any recommendations on cheaper glass blades?
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Unread 01-10-2016, 02:13 PM   #30
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Here is one

Here is the other

The best blade by FAR is the Monolit CPV 250 which came out after my old video was made

I should get busy on a glass tile tutorial
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