[tom20001]

Did anybody ever get a finish like that which wasn't a fault of fsc?

[simon w]

Are you asking if this is normal finish when using a FSC? pretty much yes, if you work with a turbo nozzle alongside the FLC you'll be stripe free at end of job. FSC helps contain the mess and covers area on larger drives etc but turbo nozzle should be used alongside FSC as and when you need it.

[tom20001]

No Simon these patterns seem to be in concrete.  There was a layer of algae which we clean but the below wouldn't change even with turbo nozzle. We don't other parts of this same building before and after and they were all fine. Its like it's in the concrete aggregate

[Splash & dash]

No never get that using a fsc  think you need to overlap. Your passes  looks like you are missing bits

[tom20001]

No never get that using a fsc  think you need to overlap. Your passes  looks like you are missing bits

That's what I'm saying. The marks wouldn't come off even with turbo nozzle. Then we done loads of other paths on premises and they are all perfect as normal.  So if it was problem with fsc then other paths before and after wouldnt be right surely. And it would lift with turbo also. So im confused tbh! But these 2 areas for whatever reason came up like that under the original film of algae

[tom20001]

And also when cleaning was done we took our time and obviously went back over when it dried out but same thing. Been using an fsc for a long time but never seen anything like that

[Slacky]

You need to move the FSC in a figure of 8 as you move forward. That will eliminate this effect. It’s a slightly awkward procedure but you’ll get the hang of it.

[tom20001]

Like we done these after and all perfect. I get that it looks like we missed spots as patterns look exactly like that or didn't overlap with fsc but that wasn't case tbh. Like I'm even doubting myself now looking at photos again but when turbo doesn't remove it?

[tom20001]

That's a before pic btw 😜

[Splash & dash]

Does applying a hypo mix get rid of it ? Is it algae in or under the surface we always hypo first then pw  I know others do it the other way round but in 25 years of pw never seen that before

[Smudger]

I think most have covered the question - poor application of the FSC - its on concrete - and relatively new at that - you may have driven some of the grime into the surface making it difficult to remove - a strong hypo solution - agitated then  turbo'd id your best option - if the pattern is still there then plead to the client the marks must have been there  bofore and you've now highlighted the issue

Darran

[tom20001]

I done hypo test patch so will have a look Monday.  As for driving stuff into concrete that just doesn't stack up. I'm almost certain it's in the concrete aggregate! It's on 2 parts which add up to about 200m2 which is about 5% of total area pressure washed as everywhere else is perfect some of which was done before this area and some after all with fsc. Where it is is all in 2 continuous areas
So I'm bit bemused. Could partially block nozzle cause something like that?

[tom20001]

Will redo area Monday and see !

[Splash & dash]

I done hypo test patch so will have a look Monday.  As for driving stuff into concrete that just doesn't stack up. I'm almost certain it's in the concrete aggregate! It's on 2 parts which add up to about 200m2 which is about 5% of total area pressure washed as everywhere else is perfect some of which was done before this area and some after all with fsc. Where it is is all in 2 continuous areas
So I'm bit bemused. Could partially block nozzle cause something like that?

Yes a blocked nozzle could cause that but usually it gives lines in a circle

[tom20001]

I done hypo test patch so will have a look Monday.  As for driving stuff into concrete that just doesn't stack up. I'm almost certain it's in the concrete aggregate! It's on 2 parts which add up to about 200m2 which is about 5% of total area pressure washed as everywhere else is perfect some of which was done before this area and some after all with fsc. Where it is is all in 2 continuous areas
So I'm bit bemused. Could partially block nozzle cause something like that?

Yes a blocked nozzle could cause that but usually it gives lines in a circle

Cheers Splash. Only thing is all concrete done after that is fine. Another x3 the area I'd say of the area marked , concrete done before it all fine too. All done on same day. May get Jessica fletcher on case as it has me puzzled!

[tom20001]

Thanks for input lads! I don't do stress much really but this one has got me bit annoyed

[Smudger]

If you've done a hypo test you would know the result in 10 minutes - if the lines are still there then there a fault in the surface
mind you if your in doubt - as its concrete I would also test with brick acid - if the stain is not organic based 1000 ptrs of hypo will have no effect

Darran

[tom20001]

If you've done a hypo test you would know the result in 10 minutes - if the lines are still there then there a fault in the surface
mind you if your in doubt - as its concrete I would also test with brick acid - if the stain is not organic based 1000 ptrs of hypo will have no effect

Darran

Thanks Darran. I actually didn't get finished til up 7pm Friday evening and never went back to check it at that stage.  I threw on concentrate hypo to be sure but as it was wet hard to see whether staining was gone.  Actually can't wait til tomorrow morning to get back there! That's a bad way to be of a sunday

[the king]

I cleaned a job only once this happened and I hyped then rinsed looked perfect

[Smudger]

Update....?