Stucco On Block

Jengle

I have a customer that has a block house with stucco applied, then paint. At several areas, all hit by sprinklers, the stucco is failing and it now has the consistency of drywall dust. It and the paint are coming off. We are located in Phoenix so the extreme heat may be a factor. I am a handyman. I know that there are those on this site that acquaint that with dreg but some folks need a deck and a new toilet. Actually, I have a B3 and I am a carpenter. Can a mason give me a line on how I might address this problem so that I can warranty the quality work for a decent period of time?

Left to my own, I would get the dead mud off, prime or seal the block, re-apply the stucco (cement glue needed?), prime or seal again then paint.

any suggestions as to why it is happenign in the first place...other than a feller used drywall mud for stucco?

thanx, jeff

Tscarborough

Make sure the sprinkler does not hit the wall. Other than that you have it, just make sure there is no paint on the repair areas.

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Sir Mixalot

Definitely use a bonding agent before re-stuccoing.

Jengle

Okay, I cannot find a local licensed contractor that wants to take on such a small job so I am going to give it my best shot. I will knock off all the old stucco and scarify the surface. Next I will spray the areas down withe muriatic acid in a garden sprayer, then I will apply cement glus directly to the area to be patched and apply nes stucco. After that I will roller-apply a primer that I can really work into the surface and re-paint. That should do it for another 4 years huh?

CJKarl

Just my opinion. I don't do a lot of stucco. But I do use acrylic bonding agents. I find that any acrylic bonding agent mixed with a portland cement or a portland based mortar mix do not hold up well to any exterior masonry materials that are expose to a lot of water.

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Tscarborough

CJKarl, there are 2 types of bonding agents. One type will re-emulsify once, the other multiple times. For vertical above grade applications, either will work fine. For below grade and water contact, only the former will work. Check your label.

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CJKarl

In my opinion the labels are vague. I've seen break down of the bed when the acrylic is rated for exterior.
The problem I see is when it's used in a bluestone over concrete application.
Just about ANY paving system is going to let water in. In my opinion in a real world situation. Do not use bonding agents when laying masonry over a slab.

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Tscarborough

They are vauge, which is all the more reason to be sure. The simplest way is to ask if it is OK for swimming pools. If it is, then it is GTG for anything.

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CJKarl

Yes it's a bit of a cross thread. But my gut feeling is acrylic admixtures belong inside. I will not use them on exterior applications.
There is no reason that traditional masonry products will not hold up if used correctly.
Do you think that by using admixtures your stucco is going to last over 100 years?
Portland based stuccos do.

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tkle

There's no need for the acid. You're better off without it.
Normally there is no need for the glue. In this case it will secure any loose particles from the scarifying. Not much will help with the sprinklers except regular repainting. A coat of cement based waterproofing might work.