How To Repair Stucco After Fixing A Pipe

At beginning glance, the seamless coat of stucco on the Eastward Boston house looked equally bulletproof equally a sidewalk, the perfect foil confronting the harsh wet weather condition of this coastal urban center. Yet beneath its lush cloak of ivy, the cement beat out was a mess of cracks and buckling, signs that water had gotten in and damaged the underlying wood lath.

When properly installed, stucco (a cement- or lime-based plaster) is about as carefree and long-lived a cladding as anyone could wish—100 years is not uncommon. Merely when big cracks or blisters appear, the time to make repairs is right away, before the harm grows.

Antonio DiSilva of MJM Masonry performed the remedial work on the East Boston firm over ten days, ripping off loose textile and patching information technology with three separate coats. Hither's how to brand stucco repair that lasts.

Stucco Recipes

Stucco Recipes

First coat:

1⁄2 bag (47 lbs.) Portland cement
6 shovels brick or masonʼs sand, slightly clammy
1 shovel hydrated lime
1⁄two cup acrylic bonding amanuensis

Second and finish coats:

1⁄two bag (47 lbs.) portland cement
eight shovels aggregate sand for concrete
1 shovel hydrated lime
ane⁄2 loving cup acrylic bonding agent

Directions:

Shovel the dry out ingredients into a wheelbarrow and alloy them with a mortar hoe.
Add the acrylic bonding amanuensis, so stir in water, a little at a time, until the mix reaches the consistency of buttercream frosting.
Too much water will make it loose and unworkable.
Once water is added, the mix will stay usable for 30 to 90 minutes before it starts to harden.

Sentry The Weather

Freezing temperatures tin can ruin wet stucco. Wait for dark temperatures that stay above 40 degrees earlier tackling repairs. Hot, dry, windy weather condition tin can too interfere by sucking out moisture the mix needs to cure properly. Work in the shade so the stucco doesn't dry too fast. Betwixt coats, keep the patch moist by covering information technology with a plastic sheet.

Work Safely

The alkalis in moisture cement tin can crusade burns. So when working with fresh stucco, wear gloves or impact the mix simply with your tools, not your fingers. Keep a bucket of h2o nearby to wash any splashes off your skin.

Finish It Right

No patch, no matter how expertly textured, volition match the color of the old stucco around it. To exercise that, you lot need to apply a pigmented coating over the unabridged surface. The patch at this house was covered with a thick, sprayed-on acrylic elastomer that bridges and seals hairline cracks. Other acceptable coatings include concrete paints and stains, mineral paints, lime washes, and "fog coats" of pigmented cement. Whichever coating you use, make sure it's alkaline tolerant and permeable to water vapor. Otherwise, it will be peeling off in no time.

Steps for Repairing Stucco

Step 1: Break Off Loose Stucco

Whack it with a hammer, or a hammer and a cold chisel, taking care non to damage the underlying wood lath supports. Eye protection is a must.

Footstep 2: Flake Away At The Edges

Continue until y'all reach stucco that'due south firmly adhered to its board. Cut any metallic mesh with snips.

Step iii: Comprehend The Exposed Board

Using a utility knife, trim a slice of grade-D architect's paper to fit tightly forth the purlieus where the old stucco meets the exposed woods lath. Fasten the paper to the board with covering nails, then put a second layer of paper on tiptop of the first.

Step 4: Add together Mesh

Identify galvanized metal lath over the newspaper and trim information technology tight confronting the edge of the stucco. Snips with get-go handles will make this job easier. Bulldoze more roofing nails through the mesh and into the wood lath.

Footstep five: Mix The Stucco

Following the kickoff-glaze recipe, stir upwardly a batch of stucco, using a wheelbarrow as a mixing bowl. The acrylic bonding agent added to this mix improves the adhesion of the new stucco to the old.

Step 6: Sling It

Moisture the edge of the old stucco so it won't suck moisture out of the patch and weaken the bond between old and new. Scoop fist-size wads of wet stucco onto a brick trowel and toss them against the wire lath until information technology's completely covered. Smooth the mix with a finishing trowel, then pack it confronting the border of the existing stucco with a brick trowel. Keep calculation more material until this layer is about 1/two inch below the existing stucco surface.

Pace 7: Scratch It

When the patch loses its moisture sheen, score its surface to meliorate the bond to the adjacent glaze. Tape a plastic sheet over the patch to keep it from drying out.

Step eight: Apply Second Coat

Look seven days, then remove the plastic and mist the patch with water. Mix upward a batch of stucco following the second-coat recipe, and trowel on a 3/viii-inch-thick coat, working from the bottom upward. Pack downwards the edges with a brick trowel. Wait for the wet sheen to disappear, then trowel the patch smooth, just below the level of the existing stucco. Cover once again with a plastic sheet.

Step 9: Put On The Finish Coat

Afterwards 3 days, remove the plastic, mist the patch, and mix upwardly a fresh batch of stucco, following the cease-coat recipe. Dissimilar textures require different techniques. To match this wall'due south original "dash" finish, DiSilva scooped small globs of wet mix onto his brick trowel, then flicked them against the wall until they were flush with the old surface.

Stride x: Wait To Pigment

Let the patch cure for a week before painting information technology and the residue of the wall. Under a coat of heavy-bodied acrylic elastomer, the patch is invisible.

Tools:

Source: https://www.thisoldhouse.com/siding/21016528/how-to-repair-stucco

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