Stucco Repair in Tempe, AZ

Some areas of Arizona have expansive clay soils that swell when wet and shrink as they dry, which can cause foundations to move and walls to crack. Poor drainage around a building makes this worse. Restoration may involve repairing cracks, improving drainage so water is directed away from the foundation and, in more serious cases, structural foundation repairs designed by an engineer.

Walking around the house once or twice a year to look for new cracks, staining, efflorescence and damaged areas allows stucco problems to be addressed early, before water causes hidden damage behind the wall.

Mortar joints deteriorate over time, becoming cracked, crumbly or recessed. Repointing removes deteriorated mortar to a consistent depth and replaces it with fresh mortar, restoring the joint's strength and weather resistance. The new mortar should be compatible with the existing masonry, and matching colour and joint profile helps the repair blend in.

Breathable masonry sealers can help reduce water absorption while allowing moisture inside the wall to escape. Sealers are not appropriate for every situation, and non-breathable coatings can trap moisture and cause damage. Choosing the right product depends on the type of masonry and its exposure.

Block walls frequently serve as pool barriers, and gaps, damage or climbable features can compromise safety. Repairs should maintain the required barrier height and integrity. Pool barrier requirements vary by jurisdiction, so any changes should be checked against local rules.

Masonry fireplaces and chimneys can develop cracked mortar, damaged crowns and deteriorated flues. Since these components affect fire safety, they should be inspected regularly and repaired by professionals. Restoring chimney crowns and mortar joints keeps water out and protects the structure.

Significant restoration projects often involve structural engineers, architects and, for historic buildings, preservation specialists. Coordinating their recommendations with practical construction methods ensures repairs are technically sound, compliant with codes and achievable within the budget. Early collaboration between designers and the contractor helps identify the most effective restoration approach.

Three-coat stucco per ASTM C926 and ASTM C1063 (lath). Color coats are acrylic-modified for UV durability or integral-color cement for traditional look. Elastomeric topcoats meet ASTM D6083 for crack bridging on hairline-cracked walls. Sealants at stucco-to-window and stucco-to-trim joints are polyurethane or hybrid (Sikaflex, OSI Quad), not silicone. Weep screeds and casing bead per ASTM C1063. All work warrantied under ROC #349454.

Not all stucco cracks mean the same thing. Fine, hairline cracks in a random pattern are usually shrinkage cracks from the curing process and are mostly cosmetic. Cracks radiating from the corners of windows and doors often reflect normal movement concentrated at those weak points. Wider cracks, cracks that keep growing, or cracks with one side higher than the other may indicate structural movement and warrant closer inspection. Understanding the type of crack guides the right repair.

Four issues drive most calls. First, south and west elevation pattern cracking from UV and 40°F daily thermal cycling. Second, diagonal corner cracks at windows and doors from minor frame movement and missing diagonal lath reinforcement. Third, monsoon-driven moisture intrusion at failed sealant joints around windows, hose bibs, and electrical penetrations — water gets behind stucco and rots sheathing. Fourth, on 1990s–2000s tract homes, undersized or missing weep screeds at the foundation that trap moisture. We address the root cause, not just the visible crack.

If stucco is extensively cracked, delaminated or water-damaged across large areas, re-stuccoing the wall may be more cost-effective than repeated patching. Replacement also allows inspection and repair of the water-resistive barrier, lath and substrate beneath.

Restoration work may trigger requirements to bring parts of the building up to current codes, particularly when the building's use changes or major alterations are made. Accessibility, fire and life safety, electrical and energy requirements can all apply. Understanding these requirements early prevents surprises during permitting.

A white, powdery deposit on stucco is called efflorescence. It occurs when water moves through the material and leaves dissolved salts on the surface as it evaporates. Efflorescence itself is mostly cosmetic, but it signals that moisture is moving through the wall, and the source of that moisture should be investigated.

Many buildings must remain in use while restoration takes place. Phasing work, scheduling noisy tasks outside business hours, maintaining safe access, protecting occupants from dust and keeping essential systems operating all require careful planning. Clear communication with occupants reduces disruption.