Removing 50 m2 latex from wall, wire brush grinder, dust collection/mask ?

[threesixright]

Hi All!

Anybody has experience with removing latex from a concrete wall?

I'm removing it with a wire brush on my (Bosch) grinder (lowest speed).  Itself it works great, but the amount of dust is crazy. Place is the cellar, and ventilation there is not the best.

For dust I use a 3M ½ face-mask with N95 filter.

Since it will take me another 1,5 day and seeing the amount of dust (only did 15 minutes). Is this the right way of doing it? Other mask? Other filter? Maybe a better approach without so much of dust?

Any tips or advice much appreciated!

Thanks!
Rog.

// cant add image, image is 61 Kb.  [blink]

Your attachment couldn't be saved. This might happen because it took too long to upload or the file is bigger than the server will allow.

Please consult your server administrator for more information.

 

[Michael Kellough]

Don’t know if you can get a Porter Cable Restorer over there but it takes a wire brush and when used with a dust collector is not terribly dusty. The wire brush does throw wires out (as most of them do) so wear full eye protection.

 

[AlexThePalex]

But why is it necessary to remove it? You prefer to see plain concrete?

The hard and coarse nature of concrete makes it an absolute nightmare to clean up.

You need a Renofix for this hooked up to an extractor.

 

[six-point socket II]

Hi!

I agree with Alex, Renofix is the way to go. Especially with such a large area to cover!

If you should continue to use the angle grinder with wire brush on lowest speed, check/monitor the temperature of the angle grinder. Especially when wearing gloves, and you're not getting the temperature feedback immediately.

They tend to get extremely hot, and air flow is much lower than normal. Make it a habit of turning speed up every once in a while (without any load of course) and let the angle grinder "breath" for a couple of minutes.

Kind regards,
Oliver

 

[threesixright]

Hi All  [smile]

Thanks for the suggestions!

[member=297]Michael Kellough[/member] thanks. No such thing as porter cable on this side of the pond

[member=5277]Alex[/member] good idea! (looks like the tool you want), its a one-time job (nice but expensive piece of kit). Maybe can rent one. With regard to the why. The previous owners just try make it look nice and threw some latex on it (guessing a few layers over time). 2 walls are in a hill. The walls are very thick (guessing somewhere 40/50 cm concrete), because of the moist from the soil it can get humid and that doesn't go well with the paint (starts to let go). I spoke to some specialists and their approach is: take off the old paint, put a new layer of some breathable plaster on it. Then the moist can get through and via a ventilator needs to be brought outside again. At this point I just wanted to take the old paint off and see how it goes... Soon there will be new plumbing done, and its better to have this dusty job before that is fitted  [big grin]

[member=61712]six-point socket II[/member] thanks for the tip! Good to have you back!  [tongue]

// added a picture (small part of the wall)

 

[Cheese]

If you have a RAS 115 you could try that with some Saphir. That’s probably cheaper than the Renofix.

 

[AlexThePalex]

You can rent these things. Not Festool, but one from another brand. Buying a Renofix is not an viable option, those are very expensive and not something you buy for only 50 m2.

If you are going to plaster over it, all you need to do is remove the loose latex. Then after applying the right primer you can plaster right over it.

Concrete walls of 40/50 cm? Are you living in a German WW2 bunker?

 

[RJNeal]

What about hitting it with a viper. Paint scraper with vac attachment that Oneida dust collector people sell. I’m in the process of setting up my shop with DC and thought about ordering one just to have available when needed.

 

[threesixright]

[member=5277]Alex[/member] yeah my thoughts.  As for the walls. Close, Czech Republic  8). Bunker, could be ? Well ... the basement is a bit of a puzzle by its shape and form (ceiling height ~ 3.8 meters in the cellar [eek]). 3 walls are basically dug into a hill side. I'm no expert, but from a construction engineer I understood, this can be very tricky as water pushes against the walls with enormous force,  that can easily led to "bulging walls" is (when hunting for a house, we have seem a few, thats a true nightmare to deal with). I'm guessing this part is > 70 years old (we are still researching it), they didn't want to take any changes at the time [tongue]. Have to say, the walls seem perfectly straight. For other pats in the basement they opted to install a second wall in front of it (like the dutch "spouwmuur"), with air ventilation. Works pretty good, nice dry (and cool!).

[member=3515]RJNeal[/member]
Thanks! Nice solution, it will be brutal to this this on hand-power  [scared]

 

[RKA]

Bosch makes a concrete refinishing tool like the renofix.  Basically an angle grinder with brushes all the way around like a RAS and integrated dust collection tube at the top.  You use a diamond cup on the tool to clean up the concrete.  Ideally it works well with a cyclone attached to your vacuum so you aren’t burning through bags.  If you have tool rental places around where you live, check with them.  If you lived closer, I would send you mine.