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Question DetailsAsked on 5/31/2017

is there a good solution for restoring color to faded interlocking bricks

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1 Answer


If covered with white laitance (lime bleeding out from the concrete), a muriatic acid wash will solve that - sometimes pressure washing will also remove it satisfactorily, though more expensive.

Otherwise - if due to fading AND the color goes clear through the block (made with colored concrete), serious high-pressure pressure washing which actually removes some of the surface material will get down to unfaded material - again, pricey for largish walls. Sandblasting will also definitely do it - depends on your area and size of wall which is cheapest but usually the pressure washing. Of course, if the block was just surface stained (cheaper manufacturers do it that wasy) then as it weathers the stain bleaches out and you are left with concrete-colored - concrete block.

Another solution and for stained block - pressure wash to promote even penetration, then use concrete stain - same stain used for stained concrete patios and such. Behr and otehr make it - but on existing block you run the risk of it "taking" unevenly, especially if the block has not been well pressure washed with detergent, so in some cases you get a blotchy result - so have a small oscure test spot done first before doing a large project.

My personal preference - 3000-4000 psi pressure washing if due to laitance and algae, otherwise (assuming through-colored block) sandblasting.

Answered 3 years ago by LCD

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