Painting Garden Walls.

[paulchiangmai]

Come the dry season I want to paint the cement rendered walls around the garden, typical walls like you see everywhere. I don't want the paint to peel off as so many do especially near the ground and I don't want the paint to turn black. Any recomendations as to what sealer, paint etc to use?

[craigt3365]

How about we try this in the Do It Yourself forum? I'll be interested to read the posts as my paint is peeling off AND turning black near the bottom!

[Kwasaki]

Having the same problem, when to Homemart, they have a good cement sealer, sorry can't remember name but it isn't cheap.

Before applying obviously give it a good wire brushing to the exsisting paint on the walls taking all loose and flaking paint off.

Get a decent face mask and googles and put a long handle on the roller, the fumes from it are lethal, shut windows of house if near any part of the walls.

I couldn't get anyone Thai to do it for me, they seem to what it is like and thats why I think it did not get done in the first place.

Pour from the 5 us gal can into a roller tray and give a generous coat after drying you will see it soaks in the wall like a spounge in places.

Give it three coats and give more to areas that keep sucking it in.

Buy a good quality premium exterior acrylic, and give the wall at least two good coats, three better.

In floor areas that were going black before on mine in places I fixed tiles along for easy cleaning other places just need to be keep an eye on from the rain spashes.

When I see a black specks building up I just run along with a Thai brush and it just falls off.

Mine has been done four years now and still looking good and I will whack another coat of paint next year.

Once you have sealed the wall properly no need to do again.

Parts of the house walls are going to get the same treatment.

[cheeryble]

I'm not sure about local sealing products but if you don't want fungus on the wall you might consider doing something to the top.

I believe the black streaking so common is because the top is flat and the fungus can grow sitting in the water. Then comes more rain and washes it down the side.

The solution?

You could cap the top with say slightly overhanging tiles so the drips are clear of the sides.

You could even put a slight tilt (with mortar) on the top so water doesn't sit there as a fungal breeding ground.

Most of the peeling at the bottom will be due to splash maybe combined with rising dampness. Splash may be lessened with say shingle.

I know damp rises about a metre in London Stock brick walls, but they're very porous indeed. Depending on what your wall is it may be a lot less. It may be worth considering rendering the bottom of the sides with a waterproofer mixed in to whatever height you learn is necessary, or maybe you just have to grin and bear it.

Edited September 29, 2011 by cheeryble

[Kwasaki]

The concrete sealer is anti fugal and a good quaility paint is also.

You should already have a run off on the top of the wall.

If you don't this can be easily applied.

Once it has a good several coats of paint it stays fine, well mine does.

wall.bmp

[cheeryble]

Another thing I see nonexistent in Thailand is a birdsmouth.

This is a groove under the bottom front edge of anything water might run down, like a sill, where a wall stops at the bottom and becomes a ceiling (as in some houses or condo blocks or under a balcony).

It means the water drips off right near the edge instead of running under a short distance. I have just recently seen concrete deterioration and rebar rusting in a condo block by this type of water. A structural problem which could have been avoided for pennies when the concrete was cast or rendered.

This may help the black-stain-causing water to drip off in some places.

Cheeryble