[Hoosier]

It was requested that I clean and seal a 1200sqft patio area and steps, and raise the low spots in a couple areas. It has moss growing in the gaps, and is just slightly dingy from age.

Here's my plan of attack, tell me if I'm wrong.
-Power broom and blow the patio clean.
-lift pavers and re-set (maybe 10 bricks max.)
-Spray with Bio-Wash diluted in a pump sprayer
-scrub with brushes and power broom
-pressure wash area and pressure wash old joint sand out
-after dry, sweep in poly sand
-then apply a sealer (not sure what were using here)

The guy is wanting a anti-moss treatment. ? What's he talking about?

[Lanelle]

If I remember correctly, sealer is not to be applied over poly sand.

[Rex Mann]

Sealer can be applied over poly. sand.
I would change the order of your tasks.
I would clean it after the poly. sand has been installed.
Then seal it.

BTW: poly. sand should help with deter the moss

Peace,

Rex

PAVEREXPERTS.COM

[Hoosier]

If I clean the pavers after the polymeric sand is put in, I'll still have to power wash them before to get the sand out of the joints. Then to rinse the cleaner off, wont the power washer knock the polymeric sand out of the gaps?
Not arguing, I just don't see the logic.

[Stonehenge]

I'd make a quick call to Techniseal - I've sat through two presentations from reps recently and could've asked, but I guess that time has come and gone. Just make sure you can seal over the poly. Like Lanelle, I didn't think you could.

As for pressure washing - go light on the pressure, as you could scour the surface of the pavers and expose aggregate (depending on how powerful your washer is).

As for moss - it'll grow on everything, including poly sand. I have a bunch of it on my own patio. But I love the look. As for an anti-moss treatment, I'm not aware of one other than bleach, which is short term help for the patio but longer term problem for whatever vegetation it gets washed off into.

[Rex Mann]

if you use a chemical to clean, like Techniseal's Hardscape cleaner, you do not need the pressure washer. You want volume of water not pressure of water. Poly. sand has a max PSI of 1000. Use a PW with enough PSI to blow the poly. out, but not for the cleaning.

Peace,

Rex

PAVERSINSTALLED.COM

[Squizzy Taylor]

For Moss & Mould I am fortunate, my cousin runs a chemical business and he has his chemist mix me a very mild bleach with some sort of suspending agent which essential makes it stick, or last longer. We apply it at least 7 days after a sealing and we run it through the pressure cleaner at about 1600 Psi. It works good for 18-24 months in damp shaded areas and up to 3 where its dryer. I don't know the recipe but I do know it can be done. At the end of the day we are just making a bleach stay on the surface a bit longer and this may not be desirable on all materials. I use it on sandstone walls and some pavers.

[Ax Man]

I guess the order I would do it would be: power brush/ blow off the surface, Raise up low spots and reset, Then apply your cleaner, and powerwash out the joints and the surfaces. Have fun with that!
Now you can put in the Poly sand,Tamp and reseal after 30 days for the sand to cure.
I also sat through one of the Techniseal courses and got thier "Certification"

[alexdenipaul]

Keep in mind that the dog days of summer in Chicago translate to hot dry weather and the best time to apply a brick sealer. It is important for the pavers to be fully dried out before any sealer can be applied. A professionally applied brick sealing will provide long lasting protection from the elements and potential spills while beautifying your existing brick surface for years to come.